Add Bluetooth examples

Co-authored-by: Peter Harper <77111776+peterharperuk@users.noreply.github.com>
2023-02-10 17:59:58 -06:00
parent 03f97a8999
commit 1c5d9aa567
127 changed files with 2296 additions and 63 deletions
--- a/pico_w/CMakeLists.txt
+++ b/pico_w/CMakeLists.txt
@@ -18,27 +18,11 @@ if (PICO_CYW43_SUPPORTED) # set by PICO_BOARD=pico_w
        set(WIFI_SSID "${WIFI_SSID}" CACHE INTERNAL "WiFi SSID for examples")
        set(WIFI_PASSWORD "${WIFI_PASSWORD}" CACHE INTERNAL "WiFi password for examples")

-        add_subdirectory(blink)
-        add_subdirectory(wifi_scan)
-        add_subdirectory(access_point)
-
-        if ("${WIFI_SSID}" STREQUAL "")
-            message("Skipping some Pico W examples as WIFI_SSID is not defined")
-        elseif ("${WIFI_PASSWORD}" STREQUAL "")
-            message("Skipping some Pico W examples as WIFI_PASSWORD is not defined")
+        add_subdirectory(wifi)
+        if (NOT TARGET pico_btstack_base)
+            message("Skipping Pico W Bluetooth examples as support is not available")
        else()
-            add_subdirectory(iperf)
-            add_subdirectory(ntp_client)
-            add_subdirectory(tcp_client)
-            add_subdirectory(tcp_server)
-            add_subdirectory(freertos)
-            add_subdirectory(udp_beacon)
-
-            if (NOT PICO_MBEDTLS_PATH)
-                message("Skipping tls examples as PICO_MBEDTLS_PATH is not defined")
-            else()
-                add_subdirectory(tls_client)
-            endif()
+            add_subdirectory(bt)
        endif()
    endif()
 endif()
--- a/pico_w/bt/CMakeLists.txt
+++ b/pico_w/bt/CMakeLists.txt
@@ -0,0 +1,398 @@
+add_subdirectory(standalone)
+
+set(BTSTACK_ROOT ${PICO_SDK_PATH}/lib/btstack)
+set(BTSTACK_EXAMPLE_PATH ${BTSTACK_ROOT}/example)
+set(BTSTACK_3RD_PARTY_PATH ${BTSTACK_ROOT}/3rd-party)
+set(BT_EXAMPLE_COMMON_DIR "${CMAKE_CURRENT_LIST_DIR}")
+
+if (NOT PICO_EXTRAS_PATH)
+        message("Skipping some Pico W BTstack examples that require pico-extras")
+else()
+        add_library(pico_btstack_audio_example INTERFACE)
+        target_sources(pico_btstack_audio_example INTERFACE
+                ${PICO_BTSTACK_PATH}/src/btstack_audio.c
+                ${CMAKE_CURRENT_LIST_DIR}/btstack_audio_pico.c
+                )
+        target_link_libraries(pico_btstack_audio_example INTERFACE
+                pico_audio_i2s
+                )
+endif()
+
+# mod player used by a2dp_source_demo and mod_player and demo song
+add_library(pico_btstack_hxcmod_player INTERFACE)
+target_sources(pico_btstack_hxcmod_player INTERFACE
+        ${BTSTACK_3RD_PARTY_PATH}/hxcmod-player/hxcmod.c
+        ${BTSTACK_3RD_PARTY_PATH}/hxcmod-player/mods/nao-deceased_by_disease.c
+        )
+target_include_directories(pico_btstack_hxcmod_player INTERFACE
+        ${BTSTACK_3RD_PARTY_PATH}/hxcmod-player
+        ${BTSTACK_3RD_PARTY_PATH}/hxcmod-player/mods
+        )
+
+add_library(pico_btstack_sco_demo_util INTERFACE)
+target_sources(pico_btstack_sco_demo_util INTERFACE
+        # sco demo utils
+        ${BTSTACK_EXAMPLE_PATH}/sco_demo_util.c
+        )
+
+# Adds common stuff for all the examples
+add_library(picow_bt_example_common INTERFACE)
+target_sources(picow_bt_example_common INTERFACE
+        ${CMAKE_CURRENT_LIST_DIR}/picow_bt_example_common.c
+        )
+target_link_libraries(picow_bt_example_common INTERFACE
+        pico_stdlib
+        pico_btstack_ble
+        pico_btstack_classic
+        pico_btstack_cyw43
+        )
+target_include_directories(picow_bt_example_common INTERFACE
+        ${BT_EXAMPLE_COMMON_DIR}/config # Use our own config
+        ${BTSTACK_EXAMPLE_PATH}/
+        )
+target_compile_definitions(picow_bt_example_common INTERFACE
+        PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS=3000
+        #WANT_HCI_DUMP=1 # This enables btstack debug
+        #ENABLE_SEGGER_RTT=1
+        )
+if (TARGET pico_btstack_audio_example)
+        target_link_libraries(picow_bt_example_common INTERFACE
+                pico_btstack_audio_example
+                )
+        target_compile_definitions(picow_bt_example_common INTERFACE
+                TEST_AUDIO=1
+                )
+endif()
+
+# Adds stuff needed for cyw43 lwip
+add_library(picow_bt_example_cyw43_lwip INTERFACE)
+target_link_libraries(picow_bt_example_cyw43_lwip INTERFACE
+        picow_bt_example_common
+        )
+target_compile_definitions(picow_bt_example_cyw43_lwip INTERFACE
+        WIFI_SSID=\"${WIFI_SSID}\"
+        WIFI_PASSWORD=\"${WIFI_PASSWORD}\"
+        CYW43_LWIP=1
+        )
+target_link_libraries(picow_bt_example_cyw43_lwip INTERFACE
+        pico_lwip_iperf
+        )
+target_include_directories(picow_bt_example_cyw43_lwip INTERFACE
+        ${CMAKE_CURRENT_LIST_DIR}/../wifi # for our common lwipopts
+        )
+
+# disables cyw43 lwip
+add_library(picow_bt_example_no_cyw43_lwip INTERFACE)
+target_link_libraries(picow_bt_example_no_cyw43_lwip INTERFACE
+        picow_bt_example_common
+        )
+target_compile_definitions(picow_bt_example_no_cyw43_lwip INTERFACE
+        CYW43_LWIP=0
+        )
+
+# variant: no cyw43 lwip | poll
+add_library(picow_bt_example_no_cyw43_lwip_poll INTERFACE)
+target_sources(picow_bt_example_no_cyw43_lwip_poll INTERFACE
+        ${BT_EXAMPLE_COMMON_DIR}/picow_bt_example_poll.c
+        )
+target_link_libraries(picow_bt_example_no_cyw43_lwip_poll INTERFACE
+        picow_bt_example_no_cyw43_lwip
+        pico_cyw43_arch_poll
+        )
+
+# variant: cyw43 lwip | poll
+add_library(picow_bt_example_cyw43_lwip_poll INTERFACE)
+target_sources(picow_bt_example_cyw43_lwip_poll INTERFACE
+        ${BT_EXAMPLE_COMMON_DIR}/picow_bt_example_poll.c
+        )
+target_link_libraries(picow_bt_example_cyw43_lwip_poll INTERFACE
+        picow_bt_example_cyw43_lwip
+        pico_cyw43_arch_lwip_poll
+        )
+
+# variant: btstack lwip | poll
+add_library(picow_bt_example_btstack_lwip_poll INTERFACE)
+target_sources(picow_bt_example_btstack_lwip_poll INTERFACE
+        ${BT_EXAMPLE_COMMON_DIR}/picow_bt_example_poll.c
+        )
+target_link_libraries(picow_bt_example_btstack_lwip_poll INTERFACE
+        picow_bt_example_no_cyw43_lwip
+        pico_cyw43_arch_poll
+        pico_lwip_nosys
+        pico_btstack_bnep_lwip
+        )
+target_include_directories(picow_bt_example_btstack_lwip_poll INTERFACE
+        ${CMAKE_CURRENT_LIST_DIR}/../wifi # for our common lwipopts
+        )
+
+# variant: no cyw43 lwip | background
+add_library(picow_bt_example_no_cyw43_lwip_background INTERFACE)
+target_sources(picow_bt_example_no_cyw43_lwip_background INTERFACE
+        ${BT_EXAMPLE_COMMON_DIR}/picow_bt_example_background.c
+        )
+target_link_libraries(picow_bt_example_no_cyw43_lwip_background INTERFACE
+        picow_bt_example_no_cyw43_lwip
+        pico_cyw43_arch_threadsafe_background
+        )
+
+# variant: cyw43 lwip | background
+add_library(picow_bt_example_cyw43_lwip_background INTERFACE)
+target_sources(picow_bt_example_cyw43_lwip_background INTERFACE
+        ${BT_EXAMPLE_COMMON_DIR}/picow_bt_example_background.c
+        )
+target_link_libraries(picow_bt_example_cyw43_lwip_background INTERFACE
+        picow_bt_example_cyw43_lwip
+        pico_cyw43_arch_lwip_threadsafe_background
+        )
+
+# variant: btstack lwip | background
+add_library(picow_bt_example_btstack_lwip_background INTERFACE)
+target_sources(picow_bt_example_btstack_lwip_background INTERFACE
+        ${BT_EXAMPLE_COMMON_DIR}/picow_bt_example_background.c
+        )
+target_link_libraries(picow_bt_example_btstack_lwip_background INTERFACE
+        picow_bt_example_no_cyw43_lwip
+        pico_cyw43_arch_threadsafe_background
+        pico_lwip_nosys
+        pico_btstack_bnep_lwip
+        )
+target_include_directories(picow_bt_example_btstack_lwip_background INTERFACE
+        ${CMAKE_CURRENT_LIST_DIR}/../wifi # for our common lwipopts
+        )
+
+if (FREERTOS_KERNEL_PATH OR DEFINED ENV{FREERTOS_KERNEL_PATH})
+include(FreeRTOS_Kernel_import.cmake)
+endif()
+
+if (TARGET FreeRTOS-Kernel)
+        # common freertos stuff
+        add_library(picow_bt_example_common_freertos INTERFACE)
+        target_sources(picow_bt_example_common_freertos INTERFACE
+                ${BT_EXAMPLE_COMMON_DIR}/picow_bt_example_freertos.c
+                )
+        target_link_libraries(picow_bt_example_common_freertos INTERFACE
+                picow_bt_example_common
+                FreeRTOS-Kernel-Heap4 # FreeRTOS kernel and dynamic heap
+                )
+        target_compile_definitions(picow_bt_example_common_freertos INTERFACE
+                CYW43_TASK_STACK_SIZE=1024
+                NO_SYS=0
+                )
+        target_include_directories(picow_bt_example_common_freertos INTERFACE
+                ${FREERTOS_KERNEL_PATH}/include
+                ${FREERTOS_KERNEL_PATH}/portable/ThirdParty/GCC/RP2040/include
+                )
+
+        # variant: no cyw43 lwip | freertos
+        add_library(picow_bt_example_no_cyw43_lwip_freertos INTERFACE)
+        target_link_libraries(picow_bt_example_no_cyw43_lwip_freertos INTERFACE
+                picow_bt_example_common_freertos
+                picow_bt_example_no_cyw43_lwip
+                pico_cyw43_arch_sys_freertos
+                )
+
+        # variant: cyw43 lwip | freertos
+        add_library(picow_bt_example_cyw43_lwip_freertos INTERFACE)
+        target_link_libraries(picow_bt_example_cyw43_lwip_freertos INTERFACE
+                picow_bt_example_common_freertos
+                picow_bt_example_cyw43_lwip
+                pico_cyw43_arch_lwip_sys_freertos
+                )
+        target_compile_definitions(picow_bt_example_cyw43_lwip_freertos INTERFACE
+                HAVE_LWIP=1 # stops btstack calling lwip_init
+                )
+
+        # variant: btstack lwip | freertos
+        add_library(picow_bt_example_btstack_lwip_freertos INTERFACE)
+        target_link_libraries(picow_bt_example_btstack_lwip_freertos INTERFACE
+                picow_bt_example_common_freertos
+                picow_bt_example_no_cyw43_lwip
+                pico_cyw43_arch_sys_freertos
+                pico_btstack_bnep_lwip_sys_freertos
+                pico_lwip_freertos
+                )
+        target_include_directories(picow_bt_example_btstack_lwip_freertos INTERFACE
+                ${CMAKE_CURRENT_LIST_DIR}/../wifi # for our common lwipopts
+                )
+        target_compile_definitions(picow_bt_example_btstack_lwip_freertos INTERFACE
+                HAVE_LWIP=1 # stops btstack calling lwip_init
+                )
+endif()
+
+# Common stuff for all examples. Pass the example name
+function(picow_bt_example_common NAME)
+        if (NOT TARGET picow_bt_example_common_${NAME})
+                add_library(picow_bt_example_common_${NAME} INTERFACE)
+                target_sources(picow_bt_example_common_${NAME} INTERFACE
+                        # actual example
+                        ${BTSTACK_EXAMPLE_PATH}/${NAME}.c
+                        )
+                if (EXISTS "${BTSTACK_EXAMPLE_PATH}/${NAME}.gatt")
+                        pico_btstack_make_gatt_header(picow_bt_example_common_${NAME} INTERFACE ${BTSTACK_EXAMPLE_PATH}/${NAME}.gatt)
+                endif()
+        endif()
+endfunction()
+
+# The type of example to build
+if(NOT DEFINED BTSTACK_EXAMPLE_TYPE)
+   set(BTSTACK_EXAMPLE_TYPE "background")
+endif()
+if ((NOT BTSTACK_EXAMPLE_TYPE STREQUAL "poll") AND
+    (NOT BTSTACK_EXAMPLE_TYPE STREQUAL "background") AND
+    (NOT BTSTACK_EXAMPLE_TYPE STREQUAL "freertos") AND
+    (NOT BTSTACK_EXAMPLE_TYPE STREQUAL "all"))
+        message(FATAL_ERROR "Unknown BTSTACK_EXAMPLE_TYPE '${BTSTACK_EXAMPLE_TYPE}'; valid options are 'poll', 'background', 'freertos' or 'all'")
+endif()
+set(BTSTACK_EXAMPLE_TYPE "${BTSTACK_EXAMPLE_TYPE}" CACHE INTERNAL "BT stack example type (poll|background|freertos|all)")
+
+# Add an poll example, pass btstack example name, target name, variant lib and extra libs
+function(picow_bt_example_poll NAME TARGET_NAME VARIANT_LIB)
+        if ("${BTSTACK_EXAMPLE_TYPE}" STREQUAL "poll" OR "${BTSTACK_EXAMPLE_TYPE}" STREQUAL "all")
+                picow_bt_example_common(${NAME})
+                add_executable(${TARGET_NAME}_poll)
+                target_link_libraries(${TARGET_NAME}_poll PRIVATE
+                        picow_bt_example_common_${NAME}
+                        ${VARIANT_LIB}
+                        ${ARGN} # extra libs
+                        )
+                pico_add_extra_outputs(${TARGET_NAME}_poll)
+                example_auto_set_url(${TARGET_NAME}_poll)
+        endif()
+endfunction()
+
+# Add an background example, pass btstack example name, target name, variant lib and extra libs
+function(picow_bt_example_background NAME TARGET_NAME VARIANT_LIB)
+        if ("${BTSTACK_EXAMPLE_TYPE}" STREQUAL "background" OR "${BTSTACK_EXAMPLE_TYPE}" STREQUAL "all")
+                picow_bt_example_common(${NAME})
+                add_executable(${TARGET_NAME}_background)
+                target_link_libraries(${TARGET_NAME}_background PRIVATE
+                        picow_bt_example_common_${NAME}
+                        ${VARIANT_LIB}
+                        ${ARGN} # extra libs
+                        )
+                pico_add_extra_outputs(${TARGET_NAME}_background)
+                example_auto_set_url(${TARGET_NAME}_background)
+        endif()
+endfunction()
+
+# Add a freertos example, pass btstack example name, target name, variant lib and extra libs
+function(picow_bt_example_freertos NAME TARGET_NAME VARIANT_LIB)
+        if ("${BTSTACK_EXAMPLE_TYPE}" STREQUAL "freertos" OR "${BTSTACK_EXAMPLE_TYPE}" STREQUAL "all")
+                if (TARGET FreeRTOS-Kernel)
+                        picow_bt_example_common(${NAME})
+                        add_executable(${TARGET_NAME}_freertos)
+                        target_link_libraries(${TARGET_NAME}_freertos PRIVATE
+                                picow_bt_example_common_${NAME}
+                                ${VARIANT_LIB}
+                                ${ARGN} # extra libs
+                                )
+                        pico_add_extra_outputs(${TARGET_NAME}_freertos)
+                        example_auto_set_url(${TARGET_NAME}_freertos)
+                endif()
+        endif()
+endfunction()
+
+# The default name of the bt example target
+function(picow_bt_example_target_name NAME RET)
+        SET(${RET} "picow_bt_example_${NAME}" PARENT_SCOPE)
+endfunction()
+
+# Make a btstack example, NAME should match source file in lib/btstack/example
+# Extra parameters indicate extra libraries to link to
+function(picow_bt_example NAME)
+        picow_bt_example_target_name(${NAME} TARGET_NAME)
+        picow_bt_example_poll(${NAME} ${TARGET_NAME} picow_bt_example_no_cyw43_lwip_poll ${ARGN})
+        picow_bt_example_background(${NAME} ${TARGET_NAME} picow_bt_example_no_cyw43_lwip_background ${ARGN})
+        picow_bt_example_freertos(${NAME} ${TARGET_NAME} picow_bt_example_no_cyw43_lwip_freertos ${ARGN})
+endfunction()
+
+# List of examples from btstack
+include(${BTSTACK_ROOT}/example/CMakeLists.txt)
+
+# Full list of bluetooth examples
+set(BTSTACK_EXAMPLES
+        ${EXAMPLES_GENERAL}
+        ${EXAMPLES_CLASSIC_ONLY}
+        ${EXAMPLES_LE_ONLY}
+        ${EXAMPLES_DUAL_MODE}
+        pan_lwip_http_server
+)
+
+# These examples run wifi and bt at the same time
+if (WIFI_SSID AND WIFI_PASSWORD)
+        list(APPEND BTSTACK_EXAMPLES
+                gatt_counter_with_wifi
+                gatt_streamer_server_with_wifi
+                #spp_streamer_with_wifi
+        )
+endif()
+
+# Extra examples that are not that interesting or a bit tricky to run
+# They are not built unless BTSTACK_EXAMPLES_ALL=1
+set(BTSTACK_EXAMPLES_ADDITIONAL
+        ancs_client_demo
+        att_delayed_response
+        avrcp_browsing_client
+        dut_mode_classic
+        gap_dedicated_bonding
+        gap_link_keys
+        le_credit_based_flow_control_mode_client
+        le_credit_based_flow_control_mode_server
+        le_mitm
+        led_counter
+        sdp_bnep_query
+        sdp_general_query
+        spp_flowcontrol
+        sdp_rfcomm_query
+        spp_and_gatt_counter
+        spp_and_gatt_streamer
+        hfp_ag_demo
+        hsp_ag_demo
+        hfp_hf_demo
+        hsp_hs_demo
+        mod_player
+        sine_player
+        ublox_spp_le_counter
+        nordic_spp_le_streamer
+        nordic_spp_le_counter
+        hog_boot_host_demo
+        gatt_battery_query
+        gatt_browser
+        gatt_device_information_query
+        le_streamer_client
+)
+
+# These examples will only be built if pico-extras exists
+set(BTSTACK_EXAMPLES_NEED_EXTRAS
+        a2dp_sink_demo
+        hfp_hf_demo
+        hfp_ag_demo
+        hsp_ag_demo
+        hsp_hs_demo
+        mod_player
+        sine_player
+)
+
+# Add examples
+set(BTSTACK_EXAMPLE_COUNT 0)
+list(REMOVE_DUPLICATES BTSTACK_EXAMPLES)
+foreach(NAME ${BTSTACK_EXAMPLES})
+        # Ignore if sub folder not found
+        if (NOT IS_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/${NAME})
+                continue()
+        endif()
+        # Ignore example if it needs pico-extras and pico-extras could not be found
+        if (NOT PICO_EXTRAS_PATH AND ${NAME} IN_LIST BTSTACK_EXAMPLES_NEED_EXTRAS)
+                continue()
+        endif()
+        # Ignore less interesting examples if BTSTACK_EXAMPLES_ALL=1 is not set
+        if (NOT BTSTACK_EXAMPLES_ALL AND ${NAME} IN_LIST BTSTACK_EXAMPLES_ADDITIONAL)
+                continue()
+        endif()
+        # add example
+        add_subdirectory(${NAME})
+        MATH(EXPR BTSTACK_EXAMPLE_COUNT "${BTSTACK_EXAMPLE_COUNT}+1")
+endforeach()
+message("Adding ${BTSTACK_EXAMPLE_COUNT} BTstack examples of type '${BTSTACK_EXAMPLE_TYPE}'")
+
+suppress_btstack_warnings()
--- a/pico_w/freertos/FreeRTOS_Kernel_import.cmake
+++ b/pico_w/freertos/FreeRTOS_Kernel_import.cmake
--- a/pico_w/bt/a2dp_sink_demo/CMakeLists.txt
+++ b/pico_w/bt/a2dp_sink_demo/CMakeLists.txt
@@ -0,0 +1,7 @@
+add_library(a2dp_sink_demo_pins INTERFACE)
+target_compile_definitions(a2dp_sink_demo_pins INTERFACE
+    PICO_AUDIO_I2S_DATA_PIN=9
+    PICO_AUDIO_I2S_CLOCK_PIN_BASE=10
+    )
+
+picow_bt_example(a2dp_sink_demo pico_btstack_sbc_decoder a2dp_sink_demo_pins)
--- a/pico_w/bt/a2dp_source_demo/CMakeLists.txt
+++ b/pico_w/bt/a2dp_source_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(a2dp_source_demo pico_btstack_hxcmod_player pico_btstack_sbc_encoder)
--- a/pico_w/bt/ancs_client_demo/CMakeLists.txt
+++ b/pico_w/bt/ancs_client_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(ancs_client_demo)
--- a/pico_w/bt/att_delayed_response/CMakeLists.txt
+++ b/pico_w/bt/att_delayed_response/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(att_delayed_response)
--- a/pico_w/bt/avrcp_browsing_client/CMakeLists.txt
+++ b/pico_w/bt/avrcp_browsing_client/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(avrcp_browsing_client)
--- a/pico_w/bt/btstack_audio_pico.c
+++ b/pico_w/bt/btstack_audio_pico.c
@@ -0,0 +1,208 @@
+/*
+ * Copyright (C) 2022 BlueKitchen GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ * 4. Any redistribution, use, or modification is done solely for
+ *    personal benefit and not for any commercial purpose or for
+ *    monetary gain.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
+ * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Please inquire about commercial licensing options at 
+ * contact@bluekitchen-gmbh.com
+ *
+ */
+
+#define BTSTACK_FILE__ "btstack_audio_pico.c"
+
+/*
+ *  btstack_audio_pico.c
+ *
+ *  Implementation of btstack_audio.h using pico_i2s
+ *
+ */
+
+#include "btstack_config.h"
+
+#include "btstack_debug.h"
+#include "btstack_audio.h"
+#include "btstack_run_loop.h"
+
+#include <stddef.h>
+#include <hardware/dma.h>
+
+#include "pico/audio_i2s.h"
+
+#define DRIVER_POLL_INTERVAL_MS          5
+#define SAMPLES_PER_BUFFER 512
+
+// client
+static void (*playback_callback)(int16_t * buffer, uint16_t num_samples);
+
+// timer to fill output ring buffer
+static btstack_timer_source_t  driver_timer_sink;
+
+
+static bool btstack_audio_pico_sink_active;
+
+// from pico-playground/audio/sine_wave/sine_wave.c
+
+static audio_format_t        btstack_audio_pico_audio_format;
+static audio_buffer_format_t btstack_audio_pico_producer_format;
+static audio_buffer_pool_t * btstack_audio_pico_audio_buffer_pool;
+static uint8_t               btstack_audio_pico_channel_count;
+
+static audio_buffer_pool_t *init_audio(uint32_t sample_frequency, uint8_t channel_count) {
+
+    // num channels requested by application
+    btstack_audio_pico_channel_count = channel_count;
+
+    // always use stereo
+    btstack_audio_pico_audio_format.format = AUDIO_BUFFER_FORMAT_PCM_S16;
+    btstack_audio_pico_audio_format.sample_freq = sample_frequency;
+    btstack_audio_pico_audio_format.channel_count = 2;
+
+    btstack_audio_pico_producer_format.format = &btstack_audio_pico_audio_format;
+    btstack_audio_pico_producer_format.sample_stride = 2 * 2;
+
+    audio_buffer_pool_t * producer_pool = audio_new_producer_pool(&btstack_audio_pico_producer_format, 3, SAMPLES_PER_BUFFER); // todo correct size
+
+    audio_i2s_config_t config;
+    config.data_pin       = PICO_AUDIO_I2S_DATA_PIN;
+    config.clock_pin_base = PICO_AUDIO_I2S_CLOCK_PIN_BASE;
+    config.dma_channel    = (int8_t) dma_claim_unused_channel(true);
+    config.pio_sm         = 0;
+
+    // audio_i2s_setup claims the channel again https://github.com/raspberrypi/pico-extras/issues/48
+    dma_channel_unclaim(config.dma_channel);
+    const audio_format_t * output_format = audio_i2s_setup(&btstack_audio_pico_audio_format, &config);
+    if (!output_format) {
+        panic("PicoAudio: Unable to open audio device.\n");
+    }
+
+    bool ok = audio_i2s_connect(producer_pool);
+    assert(ok);
+    (void)ok;
+
+    return producer_pool;
+}
+
+static void btstack_audio_pico_sink_fill_buffers(void){
+    while (true){
+        audio_buffer_t * audio_buffer = take_audio_buffer(btstack_audio_pico_audio_buffer_pool, false);
+        if (audio_buffer == NULL){
+            break;
+        }
+
+        int16_t * buffer16 = (int16_t *) audio_buffer->buffer->bytes;
+        (*playback_callback)(buffer16, audio_buffer->max_sample_count);
+
+        // duplicate samples for mono
+        if (btstack_audio_pico_channel_count == 1){
+            int16_t i;
+            for (i = SAMPLES_PER_BUFFER - 1 ; i >= 0; i--){
+                buffer16[2*i  ] = buffer16[i];
+                buffer16[2*i+1] = buffer16[i];
+            }
+        }
+
+        audio_buffer->sample_count = audio_buffer->max_sample_count;
+        give_audio_buffer(btstack_audio_pico_audio_buffer_pool, audio_buffer);
+    }
+}
+
+static void driver_timer_handler_sink(btstack_timer_source_t * ts){
+
+    // refill
+    btstack_audio_pico_sink_fill_buffers();
+
+    // re-set timer
+    btstack_run_loop_set_timer(ts, DRIVER_POLL_INTERVAL_MS);
+    btstack_run_loop_add_timer(ts);
+}
+
+static int btstack_audio_pico_sink_init(
+    uint8_t channels,
+    uint32_t samplerate, 
+    void (*playback)(int16_t * buffer, uint16_t num_samples)
+){
+    btstack_assert(playback != NULL);
+    btstack_assert(channels != 0);
+
+    playback_callback  = playback;
+
+    btstack_audio_pico_audio_buffer_pool = init_audio(samplerate, channels);
+
+    return 0;
+}
+
+static void btstack_audio_pico_sink_set_volume(uint8_t volume){
+    UNUSED(volume);
+}
+
+static void btstack_audio_pico_sink_start_stream(void){
+
+    // pre-fill HAL buffers
+    btstack_audio_pico_sink_fill_buffers();
+
+    // start timer
+    btstack_run_loop_set_timer_handler(&driver_timer_sink, &driver_timer_handler_sink);
+    btstack_run_loop_set_timer(&driver_timer_sink, DRIVER_POLL_INTERVAL_MS);
+    btstack_run_loop_add_timer(&driver_timer_sink);
+
+    // state
+    btstack_audio_pico_sink_active = true;
+
+    audio_i2s_set_enabled(true);
+}
+
+static void btstack_audio_pico_sink_stop_stream(void){
+
+    audio_i2s_set_enabled(false);
+
+    // stop timer
+    btstack_run_loop_remove_timer(&driver_timer_sink);
+    // state
+    btstack_audio_pico_sink_active = false;
+}
+
+static void btstack_audio_pico_sink_close(void){
+    // stop stream if needed
+    if (btstack_audio_pico_sink_active){
+        btstack_audio_pico_sink_stop_stream();
+    }
+}
+
+static const btstack_audio_sink_t btstack_audio_pico_sink = {
+    .init = &btstack_audio_pico_sink_init,
+    .set_volume = &btstack_audio_pico_sink_set_volume,
+    .start_stream = &btstack_audio_pico_sink_start_stream,
+    .stop_stream = &btstack_audio_pico_sink_stop_stream,
+    .close = &btstack_audio_pico_sink_close,
+};
+
+const btstack_audio_sink_t * btstack_audio_pico_sink_get_instance(void){
+    return &btstack_audio_pico_sink;
+}
--- a/pico_w/bt/config/FreeRTOSConfig.h
+++ b/pico_w/bt/config/FreeRTOSConfig.h
@@ -0,0 +1,143 @@
+/*
+ * FreeRTOS V202111.00
+ * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+#ifndef FREERTOS_CONFIG_H
+#define FREERTOS_CONFIG_H
+
+/*-----------------------------------------------------------
+ * Application specific definitions.
+ *
+ * These definitions should be adjusted for your particular hardware and
+ * application requirements.
+ *
+ * THESE PARAMETERS ARE DESCRIBED WITHIN THE 'CONFIGURATION' SECTION OF THE
+ * FreeRTOS API DOCUMENTATION AVAILABLE ON THE FreeRTOS.org WEB SITE.
+ *
+ * See http://www.freertos.org/a00110.html
+ *----------------------------------------------------------*/
+
+/* Scheduler Related */
+#define configUSE_PREEMPTION                    1
+#define configUSE_TICKLESS_IDLE                 0
+#define configUSE_IDLE_HOOK                     0
+#define configUSE_TICK_HOOK                     0
+#define configTICK_RATE_HZ                      ( ( TickType_t ) 1000 )
+#define configMAX_PRIORITIES                    32
+#define configMINIMAL_STACK_SIZE                ( configSTACK_DEPTH_TYPE ) 1024
+#define configUSE_16_BIT_TICKS                  0
+
+#define configIDLE_SHOULD_YIELD                 1
+
+/* Synchronization Related */
+#define configUSE_MUTEXES                       1
+#define configUSE_RECURSIVE_MUTEXES             1
+#define configUSE_APPLICATION_TASK_TAG          0
+#define configUSE_COUNTING_SEMAPHORES           1
+#define configQUEUE_REGISTRY_SIZE               8
+#define configUSE_QUEUE_SETS                    1
+#define configUSE_TIME_SLICING                  1
+#define configUSE_NEWLIB_REENTRANT              0
+// todo need this for lwip FreeRTOS sys_arch to compile
+#define configENABLE_BACKWARD_COMPATIBILITY     1
+#define configNUM_THREAD_LOCAL_STORAGE_POINTERS 5
+
+/* System */
+#define configSTACK_DEPTH_TYPE                  uint32_t
+#define configMESSAGE_BUFFER_LENGTH_TYPE        size_t
+
+/* Memory allocation related definitions. */
+#define configSUPPORT_STATIC_ALLOCATION         0
+#define configSUPPORT_DYNAMIC_ALLOCATION        1
+#define configTOTAL_HEAP_SIZE                   (128*1024)
+#define configAPPLICATION_ALLOCATED_HEAP        0
+
+/* Hook function related definitions. */
+#define configCHECK_FOR_STACK_OVERFLOW          0
+#define configUSE_MALLOC_FAILED_HOOK            0
+#define configUSE_DAEMON_TASK_STARTUP_HOOK      0
+
+/* Run time and task stats gathering related definitions. */
+#define configGENERATE_RUN_TIME_STATS           0
+#define configUSE_TRACE_FACILITY                1
+#define configUSE_STATS_FORMATTING_FUNCTIONS    0
+
+/* Co-routine related definitions. */
+#define configUSE_CO_ROUTINES                   0
+#define configMAX_CO_ROUTINE_PRIORITIES         1
+
+/* Software timer related definitions. */
+#define configUSE_TIMERS                        1
+#define configTIMER_TASK_PRIORITY               ( configMAX_PRIORITIES - 1 )
+#define configTIMER_QUEUE_LENGTH                10
+#define configTIMER_TASK_STACK_DEPTH            1024
+
+/* Interrupt nesting behaviour configuration. */
+/*
+#define configKERNEL_INTERRUPT_PRIORITY         [dependent of processor]
+#define configMAX_SYSCALL_INTERRUPT_PRIORITY    [dependent on processor and application]
+#define configMAX_API_CALL_INTERRUPT_PRIORITY   [dependent on processor and application]
+*/
+
+#if FREE_RTOS_KERNEL_SMP // set by the RP2040 SMP port of FreeRTOS
+/* SMP port only */
+#define configNUM_CORES                         2
+#define configTICK_CORE                         0
+#define configRUN_MULTIPLE_PRIORITIES           1
+#define configUSE_CORE_AFFINITY                 1
+#endif
+
+/* RP2040 specific */
+#define configSUPPORT_PICO_SYNC_INTEROP         1
+#define configSUPPORT_PICO_TIME_INTEROP         1
+
+#include <assert.h>
+/* Define to trap errors during development. */
+#define configASSERT(x)                         assert(x)
+
+/* Set the following definitions to 1 to include the API function, or zero
+to exclude the API function. */
+#define INCLUDE_vTaskPrioritySet                1
+#define INCLUDE_uxTaskPriorityGet               1
+#define INCLUDE_vTaskDelete                     1
+#define INCLUDE_vTaskSuspend                    1
+#define INCLUDE_vTaskDelayUntil                 1
+#define INCLUDE_vTaskDelay                      1
+#define INCLUDE_xTaskGetSchedulerState          1
+#define INCLUDE_xTaskGetCurrentTaskHandle       1
+#define INCLUDE_uxTaskGetStackHighWaterMark     1
+#define INCLUDE_xTaskGetIdleTaskHandle          1
+#define INCLUDE_eTaskGetState                   1
+#define INCLUDE_xTimerPendFunctionCall          1
+#define INCLUDE_xTaskAbortDelay                 1
+#define INCLUDE_xTaskGetHandle                  1
+#define INCLUDE_xTaskResumeFromISR              1
+#define INCLUDE_xQueueGetMutexHolder            1
+
+/* A header file that defines trace macro can be included here. */
+
+#endif /* FREERTOS_CONFIG_H */
+
--- a/pico_w/bt/config/btstack_config.h
+++ b/pico_w/bt/config/btstack_config.h
@@ -0,0 +1,77 @@
+#ifndef _PICO_BTSTACK_BTSTACK_CONFIG_H
+#define _PICO_BTSTACK_BTSTACK_CONFIG_H
+
+// BTstack features that can be enabled
+#define ENABLE_LE_PERIPHERAL
+#define ENABLE_LE_CENTRAL
+#define ENABLE_L2CAP_LE_CREDIT_BASED_FLOW_CONTROL_MODE
+#define ENABLE_LOG_INFO
+#define ENABLE_LOG_ERROR
+#define ENABLE_PRINTF_HEXDUMP
+#define ENABLE_SCO_OVER_HCI
+
+// BTstack configuration. buffers, sizes, ...
+#define HCI_OUTGOING_PRE_BUFFER_SIZE 4
+#define HCI_ACL_PAYLOAD_SIZE (1691 + 4)
+#define HCI_ACL_CHUNK_SIZE_ALIGNMENT 4
+#define MAX_NR_AVDTP_CONNECTIONS 1
+#define MAX_NR_AVDTP_STREAM_ENDPOINTS 1
+#define MAX_NR_AVRCP_CONNECTIONS 2
+#define MAX_NR_BNEP_CHANNELS 1
+#define MAX_NR_BNEP_SERVICES 1
+#define MAX_NR_BTSTACK_LINK_KEY_DB_MEMORY_ENTRIES  2
+#define MAX_NR_GATT_CLIENTS 1
+#define MAX_NR_HCI_CONNECTIONS 2
+#define MAX_NR_HID_HOST_CONNECTIONS 1
+#define MAX_NR_HIDS_CLIENTS 1
+#define MAX_NR_HFP_CONNECTIONS 1
+#define MAX_NR_L2CAP_CHANNELS  4
+#define MAX_NR_L2CAP_SERVICES  3
+#define MAX_NR_RFCOMM_CHANNELS 1
+#define MAX_NR_RFCOMM_MULTIPLEXERS 1
+#define MAX_NR_RFCOMM_SERVICES 1
+#define MAX_NR_SERVICE_RECORD_ITEMS 4
+#define MAX_NR_SM_LOOKUP_ENTRIES 3
+#define MAX_NR_WHITELIST_ENTRIES 16
+#define MAX_NR_LE_DEVICE_DB_ENTRIES 16
+
+// Limit number of ACL/SCO Buffer to use by stack to avoid cyw43 shared bus overrun
+#define MAX_NR_CONTROLLER_ACL_BUFFERS 3
+#define MAX_NR_CONTROLLER_SCO_PACKETS 3
+
+// Enable and configure HCI Controller to Host Flow Control to avoid cyw43 shared bus overrun
+#define ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
+#define HCI_HOST_ACL_PACKET_LEN 1024
+#define HCI_HOST_ACL_PACKET_NUM 3
+#define HCI_HOST_SCO_PACKET_LEN 120
+#define HCI_HOST_SCO_PACKET_NUM 3
+
+// Link Key DB and LE Device DB using TLV on top of Flash Sector interface
+#define NVM_NUM_DEVICE_DB_ENTRIES 16
+#define NVM_NUM_LINK_KEYS 16
+
+// We don't give btstack a malloc, so use a fixed-size ATT DB.
+#define MAX_ATT_DB_SIZE 512
+
+// BTstack HAL configuration
+#define HAVE_EMBEDDED_TIME_MS
+
+// map btstack_assert onto Pico SDK assert()
+#define HAVE_ASSERT
+
+// Some USB dongles take longer to respond to HCI reset (e.g. BCM20702A).
+#define HCI_RESET_RESEND_TIMEOUT_MS 1000
+
+#define ENABLE_SOFTWARE_AES128
+#define ENABLE_MICRO_ECC_FOR_LE_SECURE_CONNECTIONS
+
+#define HAVE_BTSTACK_STDIN
+
+// To get the audio demos working even with HCI dump at 115200, this truncates long ACL packetws
+//#define HCI_DUMP_STDOUT_MAX_SIZE_ACL 100
+
+#ifdef ENABLE_CLASSIC
+#define ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
+#endif
+
+#endif // MICROPY_INCLUDED_EXTMOD_BTSTACK_BTSTACK_CONFIG_H
--- a/pico_w/freertos/iperf/lwipopts.h
+++ b/pico_w/freertos/iperf/lwipopts.h
--- a/pico_w/bt/dut_mode_classic/CMakeLists.txt
+++ b/pico_w/bt/dut_mode_classic/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(dut_mode_classic)
--- a/pico_w/bt/gap_dedicated_bonding/CMakeLists.txt
+++ b/pico_w/bt/gap_dedicated_bonding/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gap_dedicated_bonding)
--- a/pico_w/bt/gap_inquiry/CMakeLists.txt
+++ b/pico_w/bt/gap_inquiry/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gap_inquiry)
--- a/pico_w/bt/gap_le_advertisements/CMakeLists.txt
+++ b/pico_w/bt/gap_le_advertisements/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gap_le_advertisements)
--- a/pico_w/bt/gap_link_keys/CMakeLists.txt
+++ b/pico_w/bt/gap_link_keys/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gap_link_keys)
--- a/pico_w/bt/gatt_battery_query/CMakeLists.txt
+++ b/pico_w/bt/gatt_battery_query/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gatt_battery_query)
--- a/pico_w/bt/gatt_browser/CMakeLists.txt
+++ b/pico_w/bt/gatt_browser/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gatt_browser)
--- a/pico_w/bt/gatt_counter/CMakeLists.txt
+++ b/pico_w/bt/gatt_counter/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gatt_counter)
--- a/pico_w/bt/gatt_counter_with_wifi/CMakeLists.txt
+++ b/pico_w/bt/gatt_counter_with_wifi/CMakeLists.txt
@@ -0,0 +1,6 @@
+set(NAME gatt_counter)
+picow_bt_example_target_name(${NAME}_with_wifi TARGET_NAME)
+
+picow_bt_example_poll(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_poll)
+picow_bt_example_background(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_background)
+picow_bt_example_freertos(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_freertos)
--- a/pico_w/bt/gatt_device_information_query/CMakeLists.txt
+++ b/pico_w/bt/gatt_device_information_query/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gatt_device_information_query)
--- a/pico_w/bt/gatt_heart_rate_client/CMakeLists.txt
+++ b/pico_w/bt/gatt_heart_rate_client/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gatt_heart_rate_client)
--- a/pico_w/bt/gatt_streamer_server/CMakeLists.txt
+++ b/pico_w/bt/gatt_streamer_server/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(gatt_streamer_server)
--- a/pico_w/bt/gatt_streamer_server_with_wifi/CMakeLists.txt
+++ b/pico_w/bt/gatt_streamer_server_with_wifi/CMakeLists.txt
@@ -0,0 +1,6 @@
+set(NAME gatt_streamer_server)
+picow_bt_example_target_name(${NAME}_with_wifi TARGET_NAME)
+
+picow_bt_example_poll(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_poll)
+picow_bt_example_background(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_background)
+picow_bt_example_freertos(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_freertos)
--- a/pico_w/bt/hfp_ag_demo/CMakeLists.txt
+++ b/pico_w/bt/hfp_ag_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hfp_ag_demo pico_btstack_sco_demo_util pico_btstack_sbc_encoder)
--- a/pico_w/bt/hfp_hf_demo/CMakeLists.txt
+++ b/pico_w/bt/hfp_hf_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hfp_hf_demo pico_btstack_sco_demo_util pico_btstack_sbc_encoder)
--- a/pico_w/bt/hid_host_demo/CMakeLists.txt
+++ b/pico_w/bt/hid_host_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hid_host_demo)
--- a/pico_w/bt/hid_keyboard_demo/CMakeLists.txt
+++ b/pico_w/bt/hid_keyboard_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hid_keyboard_demo)
--- a/pico_w/bt/hid_mouse_demo/CMakeLists.txt
+++ b/pico_w/bt/hid_mouse_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hid_mouse_demo)
--- a/pico_w/bt/hog_boot_host_demo/CMakeLists.txt
+++ b/pico_w/bt/hog_boot_host_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hog_boot_host_demo)
--- a/pico_w/bt/hog_host_demo/CMakeLists.txt
+++ b/pico_w/bt/hog_host_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hog_host_demo)
--- a/pico_w/bt/hog_keyboard_demo/CMakeLists.txt
+++ b/pico_w/bt/hog_keyboard_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hog_keyboard_demo)
--- a/pico_w/bt/hog_mouse_demo/CMakeLists.txt
+++ b/pico_w/bt/hog_mouse_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hog_mouse_demo)
--- a/pico_w/bt/hsp_ag_demo/CMakeLists.txt
+++ b/pico_w/bt/hsp_ag_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hsp_ag_demo pico_btstack_sco_demo_util pico_btstack_sbc_encoder)
--- a/pico_w/bt/hsp_hs_demo/CMakeLists.txt
+++ b/pico_w/bt/hsp_hs_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(hsp_hs_demo pico_btstack_sco_demo_util pico_btstack_sbc_encoder)
--- a/pico_w/bt/le_credit_based_flow_control_mode_client/CMakeLists.txt
+++ b/pico_w/bt/le_credit_based_flow_control_mode_client/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(le_credit_based_flow_control_mode_client)
--- a/pico_w/bt/le_credit_based_flow_control_mode_server/CMakeLists.txt
+++ b/pico_w/bt/le_credit_based_flow_control_mode_server/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(le_credit_based_flow_control_mode_server)
--- a/pico_w/bt/le_mitm/CMakeLists.txt
+++ b/pico_w/bt/le_mitm/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(le_mitm)
--- a/pico_w/bt/le_streamer_client/CMakeLists.txt
+++ b/pico_w/bt/le_streamer_client/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(le_streamer_client)
--- a/pico_w/bt/led_counter/CMakeLists.txt
+++ b/pico_w/bt/led_counter/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(led_counter)
--- a/pico_w/bt/mod_player/CMakeLists.txt
+++ b/pico_w/bt/mod_player/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(mod_player pico_btstack_hxcmod_player)
--- a/pico_w/bt/nordic_spp_le_counter/CMakeLists.txt
+++ b/pico_w/bt/nordic_spp_le_counter/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(nordic_spp_le_counter)
--- a/pico_w/bt/nordic_spp_le_streamer/CMakeLists.txt
+++ b/pico_w/bt/nordic_spp_le_streamer/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(nordic_spp_le_streamer)
--- a/pico_w/bt/pan_lwip_http_server/CMakeLists.txt
+++ b/pico_w/bt/pan_lwip_http_server/CMakeLists.txt
@@ -0,0 +1,13 @@
+add_library(pan_lwip_dhserver INTERFACE)
+target_sources(pan_lwip_dhserver INTERFACE
+    ${BTSTACK_3RD_PARTY_PATH}/lwip/dhcp-server/dhserver.c
+)
+target_include_directories(pan_lwip_dhserver INTERFACE
+    ${BTSTACK_3RD_PARTY_PATH}/lwip/dhcp-server
+)
+
+picow_bt_example_target_name(pan_lwip_http_server TARGET_NAME)
+
+picow_bt_example_poll(pan_lwip_http_server ${TARGET_NAME} picow_bt_example_btstack_lwip_poll pan_lwip_dhserver pico_lwip_http)
+picow_bt_example_background(pan_lwip_http_server ${TARGET_NAME} picow_bt_example_btstack_lwip_background pan_lwip_dhserver pico_lwip_http)
+picow_bt_example_freertos(pan_lwip_http_server ${TARGET_NAME} picow_bt_example_btstack_lwip_freertos pan_lwip_dhserver pico_lwip_http)
--- a/pico_w/bt/pbap_client_demo/CMakeLists.txt
+++ b/pico_w/bt/pbap_client_demo/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(pbap_client_demo)
--- a/pico_w/bt/picow_bt_example_background.c
+++ b/pico_w/bt/picow_bt_example_background.c
@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "btstack_run_loop.h"
+#include "pico/stdlib.h"
+#include "picow_bt_example_common.h"
+
+int main() {
+    stdio_init_all();
+
+    int res = picow_bt_example_init();
+    if (res){
+        return -1;
+    }
+
+    picow_bt_example_main();
+    btstack_run_loop_execute();
+}
--- a/pico_w/bt/picow_bt_example_common.c
+++ b/pico_w/bt/picow_bt_example_common.c
@@ -0,0 +1,101 @@
+/**
+ * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "btstack_audio.h"
+#include "btstack_event.h"
+#include "hal_led.h"
+#include "pico/cyw43_arch.h"
+#include "pico/stdlib.h"
+
+#if defined(WIFI_SSID) && defined(WIFI_PASSWORD)
+#define TEST_BTWIFI 1
+#endif
+
+#if TEST_BTWIFI
+#include "lwip/ip4_addr.h"
+#include "lwip/apps/lwiperf.h"
+#endif
+
+// Start the btstack example
+int btstack_main(int argc, const char * argv[]);
+
+#if TEST_AUDIO
+const btstack_audio_sink_t * btstack_audio_pico_sink_get_instance(void);
+#endif
+
+static btstack_packet_callback_registration_t hci_event_callback_registration;
+
+static int led_state = 0;
+
+void hal_led_toggle(void){
+    led_state = 1 - led_state;
+    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, led_state);
+}
+
+static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
+    UNUSED(size);
+    UNUSED(channel);
+    bd_addr_t local_addr;
+    if (packet_type != HCI_EVENT_PACKET) return;
+    switch(hci_event_packet_get_type(packet)){
+        case BTSTACK_EVENT_STATE:
+            if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) return;
+            gap_local_bd_addr(local_addr);
+            printf("BTstack up and running on %s.\n", bd_addr_to_str(local_addr));
+            break;
+        default:
+            break;
+    }
+}
+
+#if TEST_BTWIFI
+static void iperf_report(void *arg, enum lwiperf_report_type report_type,
+                         const ip_addr_t *local_addr, u16_t local_port, const ip_addr_t *remote_addr, u16_t remote_port,
+                         u32_t bytes_transferred, u32_t ms_duration, u32_t bandwidth_kbitpsec) {
+    static uint32_t total_iperf_megabytes = 0;
+    uint32_t mbytes = bytes_transferred / 1024 / 1024;
+    float mbits = bandwidth_kbitpsec / 1000.0;
+    total_iperf_megabytes += mbytes;
+    printf("Completed iperf transfer of %d MBytes @ %.1f Mbits/sec\n", mbytes, mbits);
+    printf("Total iperf megabytes since start %d Mbytes\n", total_iperf_megabytes);
+}
+#endif
+
+int picow_bt_example_init(void) {
+    // initialize CYW43 driver architecture (will enable BT if/because CYW43_ENABLE_BLUETOOTH == 1)
+    if (cyw43_arch_init()) {
+        printf("failed to initialise cyw43_arch\n");
+        return -1;
+    }
+
+    // inform about BTstack state
+    hci_event_callback_registration.callback = &packet_handler;
+    hci_add_event_handler(&hci_event_callback_registration);
+
+    // setup i2s audio for sink
+#if TEST_AUDIO
+    btstack_audio_sink_set_instance(btstack_audio_pico_sink_get_instance());
+#endif
+    return 0;
+}
+
+void picow_bt_example_main(void) {
+
+    btstack_main(0, NULL);
+
+#if TEST_BTWIFI
+    uint32_t start_ms = to_ms_since_boot(get_absolute_time());
+    cyw43_arch_enable_sta_mode();
+    printf("Connecting to WiFi \"%s\"...\n", WIFI_SSID);
+    if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASSWORD, CYW43_AUTH_WPA2_AES_PSK, 30000)) {
+        panic("failed to connect");
+    } else {
+        printf("Connected in %lus.\n", (to_ms_since_boot(get_absolute_time()) - start_ms) / 1000);
+    }
+    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    lwiperf_start_tcp_server_default(&iperf_report, NULL);
+#endif
+}
--- a/pico_w/bt/picow_bt_example_common.h
+++ b/pico_w/bt/picow_bt_example_common.h
@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * \brief Initialise BTstack example with cyw43
+ *
+ * \return 0 if ok
+ */
+int picow_bt_example_init(void);
+
+/*
+ * \brief Run the BTstack example
+ *
+ */
+void picow_bt_example_main(void);
--- a/pico_w/bt/picow_bt_example_freertos.c
+++ b/pico_w/bt/picow_bt_example_freertos.c
@@ -0,0 +1,112 @@
+/**
+ * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/btstack_init.h"
+#include "FreeRTOS.h"
+#include "task.h"
+
+#include "picow_bt_example_common.h"
+
+#if HAVE_LWIP
+#include "pico/lwip_freertos.h"
+#include "pico/cyw43_arch.h"
+#endif
+
+#ifndef RUN_FREERTOS_ON_CORE
+#define RUN_FREERTOS_ON_CORE 0
+#endif
+
+#define TEST_TASK_PRIORITY				( tskIDLE_PRIORITY + 2UL )
+#define BLINK_TASK_PRIORITY				( tskIDLE_PRIORITY + 1UL )
+
+#ifdef TEST_BLINK_TASK
+void blink_task(__unused void *params) {
+    printf("blink_task starts\n");
+    while (true) {
+#if 0 && configNUM_CORES > 1
+        static int last_core_id;
+        if (portGET_CORE_ID() != last_core_id) {
+            last_core_id = portGET_CORE_ID();
+            printf("blinking now from core %d\n", last_core_id);
+        }
+#endif
+        hal_led_toggle();
+        vTaskDelay(200);
+    }
+}
+#endif
+
+void main_task(__unused void *params) {
+
+    int res = picow_bt_example_init();
+    if (res){
+        return;
+    }
+
+// If we're using lwip but not via cyw43 (e.g. pan) we have to call this
+#if HAVE_LWIP && !CYW43_LWIP
+    lwip_freertos_init(cyw43_arch_async_context());
+#endif
+
+    picow_bt_example_main();
+
+#ifdef TEST_BLINK_TASK
+    xTaskCreate(blink_task, "BlinkThread", configMINIMAL_STACK_SIZE, NULL, BLINK_TASK_PRIORITY, NULL);
+#endif
+
+    while(true) {
+        vTaskDelay(1000);
+    }
+
+    pico_btstack_deinit();
+
+#if HAVE_LWIP && !CYW43_LWIP
+    lwip_freertos_deinit(cyw43_arch_async_context());
+#endif
+}
+
+void vLaunch( void) {
+    TaskHandle_t task;
+    xTaskCreate(main_task, "TestMainThread", 1024, NULL, TEST_TASK_PRIORITY, &task);
+
+#if NO_SYS && configUSE_CORE_AFFINITY && configNUM_CORES > 1
+    // we must bind the main task to one core (well at least while the init is called)
+    // (note we only do this in NO_SYS mode, because cyw43_arch_freertos
+    // takes care of it otherwise)
+    vTaskCoreAffinitySet(task, 1);
+#endif
+
+    /* Start the tasks and timer running. */
+    vTaskStartScheduler();
+}
+
+int main()
+{
+    stdio_init_all();
+
+    /* Configure the hardware ready to run the demo. */
+    const char *rtos_name;
+#if ( portSUPPORT_SMP == 1 )
+    rtos_name = "FreeRTOS SMP";
+#else
+    rtos_name = "FreeRTOS";
+#endif
+
+#if ( portSUPPORT_SMP == 1 ) && ( configNUM_CORES == 2 )
+    printf("Starting %s on both cores:\n", rtos_name);
+    vLaunch();
+#elif ( RUN_FREE_RTOS_ON_CORE == 1 )
+    printf("Starting %s on core 1:\n", rtos_name);
+    multicore_launch_core1(vLaunch);
+    while (true);
+#else
+    printf("Starting %s on core 0:\n", rtos_name);
+    vLaunch();
+#endif
+    return 0;
+}
--- a/pico_w/bt/picow_bt_example_poll.c
+++ b/pico_w/bt/picow_bt_example_poll.c
@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "btstack_run_loop.h"
+#include "pico/stdlib.h"
+#include "picow_bt_example_common.h"
+
+int main() {
+    stdio_init_all();
+
+    int res = picow_bt_example_init();
+    if (res){
+        return -1;
+    }
+
+    picow_bt_example_main();
+    btstack_run_loop_execute();
+}
--- a/pico_w/bt/sdp_bnep_query/CMakeLists.txt
+++ b/pico_w/bt/sdp_bnep_query/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(sdp_bnep_query)
--- a/pico_w/bt/sdp_general_query/CMakeLists.txt
+++ b/pico_w/bt/sdp_general_query/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(sdp_general_query)
--- a/pico_w/bt/sdp_rfcomm_query/CMakeLists.txt
+++ b/pico_w/bt/sdp_rfcomm_query/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(sdp_rfcomm_query)
--- a/pico_w/bt/sine_player/CMakeLists.txt
+++ b/pico_w/bt/sine_player/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(sine_player)
--- a/pico_w/bt/sm_pairing_central/CMakeLists.txt
+++ b/pico_w/bt/sm_pairing_central/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(sm_pairing_central)
--- a/pico_w/bt/sm_pairing_peripheral/CMakeLists.txt
+++ b/pico_w/bt/sm_pairing_peripheral/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(sm_pairing_peripheral)
--- a/pico_w/bt/spp_and_gatt_counter/CMakeLists.txt
+++ b/pico_w/bt/spp_and_gatt_counter/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(spp_and_gatt_counter)
--- a/pico_w/bt/spp_and_gatt_streamer/CMakeLists.txt
+++ b/pico_w/bt/spp_and_gatt_streamer/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(spp_and_gatt_streamer)
--- a/pico_w/bt/spp_counter/CMakeLists.txt
+++ b/pico_w/bt/spp_counter/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(spp_counter)
--- a/pico_w/bt/spp_flowcontrol/CMakeLists.txt
+++ b/pico_w/bt/spp_flowcontrol/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(spp_flowcontrol)
--- a/pico_w/bt/spp_streamer/CMakeLists.txt
+++ b/pico_w/bt/spp_streamer/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(spp_streamer)
--- a/pico_w/bt/spp_streamer_client/CMakeLists.txt
+++ b/pico_w/bt/spp_streamer_client/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(spp_streamer_client)
--- a/pico_w/bt/spp_streamer_with_wifi/CMakeLists.txt
+++ b/pico_w/bt/spp_streamer_with_wifi/CMakeLists.txt
@@ -0,0 +1,6 @@
+set(NAME spp_streamer)
+picow_bt_example_target_name(${NAME}_with_wifi TARGET_NAME)
+
+picow_bt_example_poll(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_poll)
+picow_bt_example_background(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_background)
+picow_bt_example_freertos(${NAME} ${TARGET_NAME} picow_bt_example_cyw43_lwip_freertos)
--- a/pico_w/bt/standalone/CMakeLists.txt
+++ b/pico_w/bt/standalone/CMakeLists.txt
@@ -0,0 +1,68 @@
+# Standalone example that reads from the on board temperature sensor and sends notifications via BLE
+# Flashes slowly each second to show it's running
+add_executable(picow_ble_temp_sensor
+    server.c server_common.c
+    )
+target_link_libraries(picow_ble_temp_sensor
+    pico_stdlib
+    pico_btstack_ble
+    pico_btstack_cyw43
+    pico_cyw43_arch_none
+    hardware_adc
+    )
+target_include_directories(picow_ble_temp_sensor PRIVATE
+    ${CMAKE_CURRENT_LIST_DIR} # For btstack config
+    )
+pico_btstack_make_gatt_header(picow_ble_temp_sensor PRIVATE "${CMAKE_CURRENT_LIST_DIR}/temp_sensor.gatt")
+
+pico_add_extra_outputs(picow_ble_temp_sensor)
+example_auto_set_url(picow_ble_temp_sensor)
+
+# Standalone example that connects to picow_ble_temp_sensor and reads the temperature 
+# Flahes once quickly each second when it's running but not connected to another device
+# Flashes twice quickly each second when connected to another device and reading it's temperature
+add_executable(picow_ble_temp_reader
+    client.c
+    )
+target_link_libraries(picow_ble_temp_reader
+    pico_stdlib
+    pico_btstack_ble
+    pico_btstack_cyw43
+    pico_cyw43_arch_none
+    hardware_adc
+    )
+target_include_directories(picow_ble_temp_reader PRIVATE
+    ${CMAKE_CURRENT_LIST_DIR} # For btstack config
+    )
+target_compile_definitions(picow_ble_temp_reader PRIVATE
+    RUNNING_AS_CLIENT=1
+)
+
+pico_add_extra_outputs(picow_ble_temp_reader)
+example_auto_set_url(picow_ble_temp_reader)
+
+if (WIFI_SSID AND WIFI_PASSWORD)
+    # Another version of the sensor example, but this time also runs iperf over wifi
+    add_executable(picow_ble_temp_sensor_with_wifi
+        server_with_wifi.c server_common.c
+        )
+    target_link_libraries(picow_ble_temp_sensor_with_wifi
+        pico_stdlib
+        pico_btstack_ble
+        pico_btstack_cyw43
+        pico_cyw43_arch_lwip_threadsafe_background
+        pico_lwip_iperf
+        hardware_adc
+        )
+    target_include_directories(picow_ble_temp_sensor_with_wifi PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR} # For btstack config
+        )
+    target_compile_definitions(picow_ble_temp_sensor_with_wifi PRIVATE
+        WIFI_SSID=\"${WIFI_SSID}\"
+        WIFI_PASSWORD=\"${WIFI_PASSWORD}\"
+        )
+    pico_btstack_make_gatt_header(picow_ble_temp_sensor_with_wifi PRIVATE "${CMAKE_CURRENT_LIST_DIR}/temp_sensor.gatt")
+
+    pico_add_extra_outputs(picow_ble_temp_sensor_with_wifi)
+    example_auto_set_url(picow_ble_temp_sensor_with_wifi)
+endif()
--- a/pico_w/bt/standalone/btstack_config.h
+++ b/pico_w/bt/standalone/btstack_config.h
@@ -0,0 +1,58 @@
+#ifndef _PICO_BTSTACK_BTSTACK_CONFIG_H
+#define _PICO_BTSTACK_BTSTACK_CONFIG_H
+
+#ifndef ENABLE_BLE
+#error Please link to pico_btstack_ble
+#endif
+
+// BTstack features that can be enabled
+#define ENABLE_LE_PERIPHERAL
+#define ENABLE_LOG_INFO
+#define ENABLE_LOG_ERROR
+#define ENABLE_PRINTF_HEXDUMP
+
+// for the client
+#if RUNNING_AS_CLIENT
+#define ENABLE_LE_CENTRAL
+#define MAX_NR_GATT_CLIENTS 1
+#else
+#define MAX_NR_GATT_CLIENTS 0
+#endif
+
+// BTstack configuration. buffers, sizes, ...
+#define HCI_OUTGOING_PRE_BUFFER_SIZE 4
+#define HCI_ACL_PAYLOAD_SIZE (255 + 4)
+#define HCI_ACL_CHUNK_SIZE_ALIGNMENT 4
+#define MAX_NR_HCI_CONNECTIONS 1
+#define MAX_NR_SM_LOOKUP_ENTRIES 3
+#define MAX_NR_WHITELIST_ENTRIES 16
+#define MAX_NR_LE_DEVICE_DB_ENTRIES 16
+
+// Limit number of ACL/SCO Buffer to use by stack to avoid cyw43 shared bus overrun
+#define MAX_NR_CONTROLLER_ACL_BUFFERS 3
+#define MAX_NR_CONTROLLER_SCO_PACKETS 3
+
+// Enable and configure HCI Controller to Host Flow Control to avoid cyw43 shared bus overrun
+#define ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
+#define HCI_HOST_ACL_PACKET_LEN (255+4)
+#define HCI_HOST_ACL_PACKET_NUM 3
+#define HCI_HOST_SCO_PACKET_LEN 120
+#define HCI_HOST_SCO_PACKET_NUM 3
+
+// Link Key DB and LE Device DB using TLV on top of Flash Sector interface
+#define NVM_NUM_DEVICE_DB_ENTRIES 16
+#define NVM_NUM_LINK_KEYS 16
+
+// We don't give btstack a malloc, so use a fixed-size ATT DB.
+#define MAX_ATT_DB_SIZE 512
+
+// BTstack HAL configuration
+#define HAVE_EMBEDDED_TIME_MS
+// map btstack_assert onto Pico SDK assert()
+#define HAVE_ASSERT
+// Some USB dongles take longer to respond to HCI reset (e.g. BCM20702A).
+#define HCI_RESET_RESEND_TIMEOUT_MS 1000
+#define ENABLE_SOFTWARE_AES128
+#define ENABLE_MICRO_ECC_FOR_LE_SECURE_CONNECTIONS
+
+#endif // MICROPY_INCLUDED_EXTMOD_BTSTACK_BTSTACK_CONFIG_H
--- a/pico_w/bt/standalone/client.c
+++ b/pico_w/bt/standalone/client.c
@@ -0,0 +1,273 @@
+/**
+ * Copyright (c) 2023 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "btstack.h"
+#include "pico/cyw43_arch.h"
+#include "pico/stdlib.h"
+
+#if 0
+#define DEBUG_LOG(...) printf(__VA_ARGS__)
+#else
+#define DEBUG_LOG(...)
+#endif
+
+#define LED_QUICK_FLASH_DELAY_MS 100
+#define LED_SLOW_FLASH_DELAY_MS 1000
+
+typedef enum {
+    TC_OFF,
+    TC_IDLE,
+    TC_W4_SCAN_RESULT,
+    TC_W4_CONNECT,
+    TC_W4_SERVICE_RESULT,
+    TC_W4_CHARACTERISTIC_RESULT,
+    TC_W4_ENABLE_NOTIFICATIONS_COMPLETE,
+    TC_W4_READY
+} gc_state_t;
+
+static btstack_packet_callback_registration_t hci_event_callback_registration;
+static gc_state_t state = TC_OFF;
+static bd_addr_t server_addr;
+static bd_addr_type_t server_addr_type;
+static hci_con_handle_t connection_handle;
+static gatt_client_service_t server_service;
+static gatt_client_characteristic_t server_characteristic;
+static bool listener_registered;
+static gatt_client_notification_t notification_listener;
+static btstack_timer_source_t heartbeat;
+
+static void client_start(void){
+    DEBUG_LOG("Start scanning!\n");
+    state = TC_W4_SCAN_RESULT;
+    gap_set_scan_parameters(0,0x0030, 0x0030);
+    gap_start_scan();
+}
+
+static bool advertisement_report_contains_service(uint16_t service, uint8_t *advertisement_report){
+    // get advertisement from report event
+    const uint8_t * adv_data = gap_event_advertising_report_get_data(advertisement_report);
+    uint8_t adv_len  = gap_event_advertising_report_get_data_length(advertisement_report);
+
+    // iterate over advertisement data
+    ad_context_t context;
+    for (ad_iterator_init(&context, adv_len, adv_data) ; ad_iterator_has_more(&context) ; ad_iterator_next(&context)){
+        uint8_t data_type = ad_iterator_get_data_type(&context);
+        uint8_t data_size = ad_iterator_get_data_len(&context);
+        const uint8_t * data = ad_iterator_get_data(&context);
+        switch (data_type){
+            case BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS:
+                for (int i = 0; i < data_size; i += 2) {
+                    uint16_t type = little_endian_read_16(data, i);
+                    if (type == service) return true;
+                }
+            default:
+                break;
+        }
+    }
+    return false;
+}
+
+static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
+    UNUSED(packet_type);
+    UNUSED(channel);
+    UNUSED(size);
+
+    uint8_t att_status;
+    switch(state){
+        case TC_W4_SERVICE_RESULT:
+            switch(hci_event_packet_get_type(packet)) {
+                case GATT_EVENT_SERVICE_QUERY_RESULT:
+                    // store service (we expect only one)
+                    DEBUG_LOG("Storing service\n");
+                    gatt_event_service_query_result_get_service(packet, &server_service);
+                    break;
+                case GATT_EVENT_QUERY_COMPLETE:
+                    att_status = gatt_event_query_complete_get_att_status(packet);
+                    if (att_status != ATT_ERROR_SUCCESS){
+                        printf("SERVICE_QUERY_RESULT, ATT Error 0x%02x.\n", att_status);
+                        gap_disconnect(connection_handle);
+                        break;  
+                    } 
+                    // service query complete, look for characteristic
+                    state = TC_W4_CHARACTERISTIC_RESULT;
+                    DEBUG_LOG("Search for env sensing characteristic.\n");
+                    gatt_client_discover_characteristics_for_service_by_uuid16(handle_gatt_client_event, connection_handle, &server_service, ORG_BLUETOOTH_CHARACTERISTIC_TEMPERATURE);
+                    break;
+                default:
+                    break;
+            }
+            break;
+        case TC_W4_CHARACTERISTIC_RESULT:
+            switch(hci_event_packet_get_type(packet)) {
+                case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT:
+                    DEBUG_LOG("Storing characteristic\n");
+                    gatt_event_characteristic_query_result_get_characteristic(packet, &server_characteristic);
+                    break;
+                case GATT_EVENT_QUERY_COMPLETE:
+                    att_status = gatt_event_query_complete_get_att_status(packet);
+                    if (att_status != ATT_ERROR_SUCCESS){
+                        printf("CHARACTERISTIC_QUERY_RESULT, ATT Error 0x%02x.\n", att_status);
+                        gap_disconnect(connection_handle);
+                        break;  
+                    } 
+                    // register handler for notifications
+                    listener_registered = true;
+                    gatt_client_listen_for_characteristic_value_updates(&notification_listener, handle_gatt_client_event, connection_handle, &server_characteristic);
+                    // enable notifications
+                    DEBUG_LOG("Enable notify on characteristic.\n");
+                    state = TC_W4_ENABLE_NOTIFICATIONS_COMPLETE;
+                    gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle,
+                        &server_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION);
+                    break;
+                default:
+                    break;
+            }
+            break;
+        case TC_W4_ENABLE_NOTIFICATIONS_COMPLETE:
+            switch(hci_event_packet_get_type(packet)) {
+                case GATT_EVENT_QUERY_COMPLETE:
+                    DEBUG_LOG("Notifications enabled, ATT status 0x%02x\n", gatt_event_query_complete_get_att_status(packet));
+                    if (gatt_event_query_complete_get_att_status(packet) != ATT_ERROR_SUCCESS) break;
+                    state = TC_W4_READY;
+                    break;
+                default:
+                    break;
+            }
+            break;
+        case TC_W4_READY:
+            switch(hci_event_packet_get_type(packet)) {
+                case GATT_EVENT_NOTIFICATION: {
+                    uint16_t value_length = gatt_event_notification_get_value_length(packet);
+                    const uint8_t *value = gatt_event_notification_get_value(packet);
+                    DEBUG_LOG("Indication value len %d\n", value_length);
+                    if (value_length == 2) {
+                        float temp = little_endian_read_16(value, 0);
+                        printf("read temp %.2f degc\n", temp / 100);
+                    } else {
+                        printf("Unexpected length %d\n", value_length);
+                    }
+                    break;
+                }
+                default:
+                    printf("Unknown packet type 0x%02x\n", hci_event_packet_get_type(packet));
+                    break;
+            }
+            break;
+        default:
+            printf("error\n");
+            break;
+    }
+}
+
+static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
+    UNUSED(size);
+    UNUSED(channel);
+    bd_addr_t local_addr;
+    if (packet_type != HCI_EVENT_PACKET) return;
+
+    uint8_t event_type = hci_event_packet_get_type(packet);
+    switch(event_type){
+        case BTSTACK_EVENT_STATE:
+            if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING) {
+                gap_local_bd_addr(local_addr);
+                printf("BTstack up and running on %s.\n", bd_addr_to_str(local_addr));
+                client_start();
+            } else {
+                state = TC_OFF;
+            }
+            break;
+        case GAP_EVENT_ADVERTISING_REPORT:
+            if (state != TC_W4_SCAN_RESULT) return;
+            // check name in advertisement
+            if (!advertisement_report_contains_service(ORG_BLUETOOTH_SERVICE_ENVIRONMENTAL_SENSING, packet)) return;
+            // store address and type
+            gap_event_advertising_report_get_address(packet, server_addr);
+            server_addr_type = gap_event_advertising_report_get_address_type(packet);
+            // stop scanning, and connect to the device
+            state = TC_W4_CONNECT;
+            gap_stop_scan();
+            printf("Connecting to device with addr %s.\n", bd_addr_to_str(server_addr));
+            gap_connect(server_addr, server_addr_type);
+            break;
+        case HCI_EVENT_LE_META:
+            // wait for connection complete
+            switch (hci_event_le_meta_get_subevent_code(packet)) {
+                case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
+                    if (state != TC_W4_CONNECT) return;
+                    connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet);
+                    // initialize gatt client context with handle, and add it to the list of active clients
+                    // query primary services
+                    DEBUG_LOG("Search for env sensing service.\n");
+                    state = TC_W4_SERVICE_RESULT;
+                    gatt_client_discover_primary_services_by_uuid16(handle_gatt_client_event, connection_handle, ORG_BLUETOOTH_SERVICE_ENVIRONMENTAL_SENSING);
+                    break;
+                default:
+                    break;
+            }
+            break;
+        case HCI_EVENT_DISCONNECTION_COMPLETE:
+            // unregister listener
+            connection_handle = HCI_CON_HANDLE_INVALID;
+            if (listener_registered){
+                listener_registered = false;
+                gatt_client_stop_listening_for_characteristic_value_updates(&notification_listener);
+            }
+            printf("Disconnected %s\n", bd_addr_to_str(server_addr));
+            if (state == TC_OFF) break;
+            client_start();
+            break;
+        default:
+            break;
+    }
+}
+
+static void heartbeat_handler(struct btstack_timer_source *ts) {
+    // Invert the led
+    static bool quick_flash;
+    static bool led_on = true;
+
+    led_on = !led_on;
+    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, led_on);
+    if (listener_registered && led_on) {
+        quick_flash = !quick_flash;
+    } else if (!listener_registered) {
+        quick_flash = false;
+    }
+
+    // Restart timer
+    btstack_run_loop_set_timer(ts, (led_on || quick_flash) ? LED_QUICK_FLASH_DELAY_MS : LED_SLOW_FLASH_DELAY_MS);
+    btstack_run_loop_add_timer(ts);
+}
+
+int main() {
+    stdio_init_all();
+
+    // initialize CYW43 driver architecture (will enable BT if/because CYW43_ENABLE_BLUETOOTH == 1)
+    if (cyw43_arch_init()) {
+        printf("failed to initialise cyw43_arch\n");
+        return -1;
+    }
+
+    l2cap_init();
+    sm_init();
+    sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);
+    gatt_client_init();
+
+    hci_event_callback_registration.callback = &hci_event_handler;
+    hci_add_event_handler(&hci_event_callback_registration);
+
+    // set one-shot btstack timer
+    heartbeat.process = &heartbeat_handler;
+    btstack_run_loop_set_timer(&heartbeat, LED_SLOW_FLASH_DELAY_MS);
+    btstack_run_loop_add_timer(&heartbeat);
+
+    // turn on!
+    hci_power_control(HCI_POWER_ON);
+
+    btstack_run_loop_execute();
+    return 0;
+}
--- a/pico_w/bt/standalone/lwipopts.h
+++ b/pico_w/bt/standalone/lwipopts.h
@@ -0,0 +1,76 @@
+#ifndef _LWIPOPTS_H
+#define _LWIPOPTS_H
+
+// see https://www.nongnu.org/lwip/2_1_x/group__lwip__opts.html for details
+
+#define NO_SYS                      1
+#define LWIP_SOCKET                 0
+#define MEM_LIBC_MALLOC             0
+#define MEM_ALIGNMENT               4
+#define MEM_SIZE                    4000
+#define MEMP_NUM_TCP_SEG            32
+#define MEMP_NUM_ARP_QUEUE          10
+#define PBUF_POOL_SIZE              24
+#define LWIP_ARP                    1
+#define LWIP_ETHERNET               1
+#define LWIP_ICMP                   1
+#define LWIP_RAW                    1
+#define TCP_WND                     (8 * TCP_MSS)
+#define TCP_MSS                     1460
+#define TCP_SND_BUF                 (8 * TCP_MSS)
+#define TCP_SND_QUEUELEN            ((4 * (TCP_SND_BUF) + (TCP_MSS - 1)) / (TCP_MSS))
+#define LWIP_NETIF_STATUS_CALLBACK  1
+#define LWIP_NETIF_LINK_CALLBACK    1
+#define LWIP_NETIF_HOSTNAME         1
+#define LWIP_NETCONN                0
+#define MEM_STATS                   0
+#define SYS_STATS                   0
+#define MEMP_STATS                  0
+#define LINK_STATS                  0
+#define LWIP_CHKSUM_ALGORITHM       3
+#define LWIP_DHCP                   1
+#define LWIP_IPV4                   1
+#define LWIP_TCP                    1
+#define LWIP_UDP                    1
+#define LWIP_DNS                    1
+#define LWIP_TCP_KEEPALIVE          1
+#define LWIP_NETIF_TX_SINGLE_PBUF   1
+#define DHCP_DOES_ARP_CHECK         0
+#define LWIP_DHCP_DOES_ACD_CHECK    0
+
+#ifndef NDEBUG
+#define LWIP_DEBUG                  1
+#define LWIP_STATS                  1
+#define LWIP_STATS_DISPLAY          1
+#endif
+
+#define ETHARP_DEBUG                LWIP_DBG_OFF
+#define NETIF_DEBUG                 LWIP_DBG_OFF
+#define PBUF_DEBUG                  LWIP_DBG_OFF
+#define API_LIB_DEBUG               LWIP_DBG_OFF
+#define API_MSG_DEBUG               LWIP_DBG_OFF
+#define SOCKETS_DEBUG               LWIP_DBG_OFF
+#define ICMP_DEBUG                  LWIP_DBG_OFF
+#define INET_DEBUG                  LWIP_DBG_OFF
+#define IP_DEBUG                    LWIP_DBG_OFF
+#define IP_REASS_DEBUG              LWIP_DBG_OFF
+#define RAW_DEBUG                   LWIP_DBG_OFF
+#define MEM_DEBUG                   LWIP_DBG_OFF
+#define MEMP_DEBUG                  LWIP_DBG_OFF
+#define SYS_DEBUG                   LWIP_DBG_OFF
+#define TCP_DEBUG                   LWIP_DBG_OFF
+#define TCP_INPUT_DEBUG             LWIP_DBG_OFF
+#define TCP_OUTPUT_DEBUG            LWIP_DBG_OFF
+#define TCP_RTO_DEBUG               LWIP_DBG_OFF
+#define TCP_CWND_DEBUG              LWIP_DBG_OFF
+#define TCP_WND_DEBUG               LWIP_DBG_OFF
+#define TCP_FR_DEBUG                LWIP_DBG_OFF
+#define TCP_QLEN_DEBUG              LWIP_DBG_OFF
+#define TCP_RST_DEBUG               LWIP_DBG_OFF
+#define UDP_DEBUG                   LWIP_DBG_OFF
+#define TCPIP_DEBUG                 LWIP_DBG_OFF
+#define PPP_DEBUG                   LWIP_DBG_OFF
+#define SLIP_DEBUG                  LWIP_DBG_OFF
+#define DHCP_DEBUG                  LWIP_DBG_OFF
+
+#endif /* __LWIPOPTS_H__ */
--- a/pico_w/bt/standalone/server.c
+++ b/pico_w/bt/standalone/server.c
@@ -0,0 +1,79 @@
+/**
+ * Copyright (c) 2023 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "btstack.h"
+#include "pico/cyw43_arch.h"
+#include "pico/btstack_cyw43.h"
+#include "hardware/adc.h"
+#include "pico/stdlib.h"
+
+#include "server_common.h"
+
+#define HEARTBEAT_PERIOD_MS 1000
+
+static btstack_timer_source_t heartbeat;
+static btstack_packet_callback_registration_t hci_event_callback_registration;
+
+static void heartbeat_handler(struct btstack_timer_source *ts) {
+    static uint32_t counter = 0;
+    counter++;
+
+    // Update the temp every 10s
+    if (counter % 10 == 0) {
+        poll_temp();
+        if (le_notification_enabled) {
+            att_server_request_can_send_now_event(con_handle);
+        }
+    }
+
+    // Invert the led
+    static int led_on = true;
+    led_on = !led_on;
+    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, led_on);
+
+    // Restart timer
+    btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS);
+    btstack_run_loop_add_timer(ts);
+}
+
+int main() {
+    stdio_init_all();
+
+    // initialize CYW43 driver architecture (will enable BT if/because CYW43_ENABLE_BLUETOOTH == 1)
+    if (cyw43_arch_init()) {
+        printf("failed to initialise cyw43_arch\n");
+        return -1;
+    }
+
+    // Initialise adc for the temp sensor
+    adc_init();
+    adc_select_input(ADC_CHANNEL_TEMPSENSOR);
+    adc_set_temp_sensor_enabled(true);
+
+    l2cap_init();
+    sm_init();
+
+    att_server_init(profile_data, att_read_callback, att_write_callback);    
+
+    // inform about BTstack state
+    hci_event_callback_registration.callback = &packet_handler;
+    hci_add_event_handler(&hci_event_callback_registration);
+
+    // register for ATT event
+    att_server_register_packet_handler(packet_handler);
+
+    // set one-shot btstack timer
+    heartbeat.process = &heartbeat_handler;
+    btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS);
+    btstack_run_loop_add_timer(&heartbeat);
+
+    // turn on bluetooth!
+    hci_power_control(HCI_POWER_ON);
+
+    btstack_run_loop_execute();
+    return 0;
+}
--- a/pico_w/bt/standalone/server_common.c
+++ b/pico_w/bt/standalone/server_common.c
@@ -0,0 +1,106 @@
+/**
+ * Copyright (c) 2023 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "btstack.h"
+#include "hardware/adc.h"
+
+#include "temp_sensor.h"
+#include "server_common.h"
+
+#define APP_AD_FLAGS 0x06
+static uint8_t adv_data[] = {
+    // Flags general discoverable
+    0x02, BLUETOOTH_DATA_TYPE_FLAGS, APP_AD_FLAGS,
+    // Name
+    0x17, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'P', 'i', 'c', 'o', ' ', '0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0', ':', '0', '0',
+    0x03, BLUETOOTH_DATA_TYPE_COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, 0x1a, 0x18,
+};
+static const uint8_t adv_data_len = sizeof(adv_data);
+
+int le_notification_enabled;
+hci_con_handle_t con_handle;
+uint16_t current_temp;
+
+void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
+    UNUSED(size);
+    UNUSED(channel);
+    bd_addr_t local_addr;
+    if (packet_type != HCI_EVENT_PACKET) return;
+
+    uint8_t event_type = hci_event_packet_get_type(packet);
+    switch(event_type){
+        case BTSTACK_EVENT_STATE:
+            if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) return;
+            gap_local_bd_addr(local_addr);
+            printf("BTstack up and running on %s.\n", bd_addr_to_str(local_addr));
+
+            // setup advertisements
+            uint16_t adv_int_min = 800;
+            uint16_t adv_int_max = 800;
+            uint8_t adv_type = 0;
+            bd_addr_t null_addr;
+            memset(null_addr, 0, 6);
+            gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00);
+            assert(adv_data_len <= 31); // ble limitation
+            gap_advertisements_set_data(adv_data_len, (uint8_t*) adv_data);
+            gap_advertisements_enable(1);
+
+            poll_temp();
+
+            break;
+        case HCI_EVENT_DISCONNECTION_COMPLETE:
+            le_notification_enabled = 0;
+            break;
+        case ATT_EVENT_CAN_SEND_NOW:
+            att_server_notify(con_handle, ATT_CHARACTERISTIC_ORG_BLUETOOTH_CHARACTERISTIC_TEMPERATURE_01_VALUE_HANDLE, (uint8_t*)&current_temp, sizeof(current_temp));
+            break;
+        default:
+            break;
+    }
+}
+
+uint16_t att_read_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size) {
+    UNUSED(connection_handle);
+
+    if (att_handle == ATT_CHARACTERISTIC_ORG_BLUETOOTH_CHARACTERISTIC_TEMPERATURE_01_VALUE_HANDLE){
+        return att_read_callback_handle_blob((const uint8_t *)&current_temp, sizeof(current_temp), offset, buffer, buffer_size);
+    }
+    return 0;
+}
+
+int att_write_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size) {
+    UNUSED(transaction_mode);
+    UNUSED(offset);
+    UNUSED(buffer_size);
+    
+    if (att_handle != ATT_CHARACTERISTIC_ORG_BLUETOOTH_CHARACTERISTIC_TEMPERATURE_01_CLIENT_CONFIGURATION_HANDLE) return 0;
+    le_notification_enabled = little_endian_read_16(buffer, 0) == GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION;
+    con_handle = connection_handle;
+    if (le_notification_enabled) {
+        att_server_request_can_send_now_event(con_handle);
+    }
+    return 0;
+}
+
+void poll_temp(void) {
+    adc_select_input(ADC_CHANNEL_TEMPSENSOR);
+    uint32_t raw32 = adc_read();
+    const uint32_t bits = 12;
+
+    // Scale raw reading to 16 bit value using a Taylor expansion (for 8 <= bits <= 16)
+    uint16_t raw16 = raw32 << (16 - bits) | raw32 >> (2 * bits - 16);
+
+    // ref https://github.com/raspberrypi/pico-micropython-examples/blob/master/adc/temperature.py
+    const float conversion_factor = 3.3 / (65535);
+    float reading = raw16 * conversion_factor;
+    
+    // The temperature sensor measures the Vbe voltage of a biased bipolar diode, connected to the fifth ADC channel
+    // Typically, Vbe = 0.706V at 27 degrees C, with a slope of -1.721mV (0.001721) per degree. 
+    float deg_c = 27 - (reading - 0.706) / 0.001721;
+    current_temp = deg_c * 100;
+    printf("Write temp %.2f degc\n", deg_c);
+ }
--- a/pico_w/bt/standalone/server_common.h
+++ b/pico_w/bt/standalone/server_common.h
@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) 2023 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef SERVER_COMMON_H_
+#define SERVER_COMMON_H_
+
+#define ADC_CHANNEL_TEMPSENSOR 4
+
+extern int le_notification_enabled;
+extern hci_con_handle_t con_handle;
+extern uint16_t current_temp;
+extern uint8_t const profile_data[];
+
+void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
+uint16_t att_read_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size);
+int att_write_callback(hci_con_handle_t connection_handle, uint16_t att_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size);
+void poll_temp(void);
+
+#endif
--- a/pico_w/bt/standalone/server_with_wifi.c
+++ b/pico_w/bt/standalone/server_with_wifi.c
@@ -0,0 +1,117 @@
+/**
+ * Copyright (c) 2023 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "btstack.h"
+#include "pico/cyw43_arch.h"
+#include "pico/stdlib.h"
+#include "hardware/adc.h"
+
+#include "lwip/netif.h"
+#include "lwip/ip4_addr.h"
+#include "lwip/apps/lwiperf.h"
+
+#include "server_common.h"
+
+#define HEARTBEAT_PERIOD_MS 1000
+
+static void heartbeat_handler(async_context_t *context, async_at_time_worker_t *worker);
+
+static async_at_time_worker_t heartbeat_worker = { .do_work = heartbeat_handler };
+static btstack_packet_callback_registration_t hci_event_callback_registration;
+
+static void heartbeat_handler(async_context_t *context, async_at_time_worker_t *worker) {
+    static uint32_t counter = 0;
+    counter++;
+
+    // Update the temp every 10s
+    if (counter % 10 == 0) {
+        poll_temp();
+        if (le_notification_enabled) {
+            att_server_request_can_send_now_event(con_handle);
+        }
+    }
+
+    // Invert the led
+    static int led_on = true;
+    led_on = !led_on;
+    cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, led_on);
+
+    // Restart timer
+    async_context_add_at_time_worker_in_ms(context, &heartbeat_worker, HEARTBEAT_PERIOD_MS);
+}
+
+// Report IP results and exit
+static void iperf_report(void *arg, enum lwiperf_report_type report_type,
+                         const ip_addr_t *local_addr, u16_t local_port, const ip_addr_t *remote_addr, u16_t remote_port,
+                         u32_t bytes_transferred, u32_t ms_duration, u32_t bandwidth_kbitpsec) {
+    static uint32_t total_iperf_megabytes = 0;
+    uint32_t mbytes = bytes_transferred / 1024 / 1024;
+    float mbits = bandwidth_kbitpsec / 1000.0;
+
+    total_iperf_megabytes += mbytes;
+
+    printf("Completed iperf transfer of %d MBytes @ %.1f Mbits/sec\n", mbytes, mbits);
+    printf("Total iperf megabytes since start %d Mbytes\n", total_iperf_megabytes);
+}
+
+int main() {
+    stdio_init_all();
+
+    // initialize CYW43 architecture
+    //   - will enable BT if CYW43_ENABLE_BLUETOOTH == 1
+    //   - will enable lwIP if CYW43_LWIP == 1
+    if (cyw43_arch_init()) {
+        printf("failed to initialise cyw43_arch\n");
+        return -1;
+    }
+
+    // Initialise adc for the temp sensor
+    adc_init();
+    adc_select_input(ADC_CHANNEL_TEMPSENSOR);
+    adc_set_temp_sensor_enabled(true);
+
+    l2cap_init();
+    sm_init();
+    att_server_init(profile_data, att_read_callback, att_write_callback);    
+
+    // inform about BTstack state
+    hci_event_callback_registration.callback = &packet_handler;
+    hci_add_event_handler(&hci_event_callback_registration);
+
+    // register for ATT event
+    att_server_register_packet_handler(packet_handler);
+
+    // set one-shot btstack timer
+    async_context_add_at_time_worker_in_ms(cyw43_arch_async_context(), &heartbeat_worker, HEARTBEAT_PERIOD_MS);
+
+    // Connect to Wi-Fi
+    cyw43_arch_enable_sta_mode();
+    printf("Connecting to Wi-Fi...\n");
+    if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASSWORD, CYW43_AUTH_WPA2_AES_PSK, 30000)) {
+        printf("failed to connect.\n");
+        return 1;
+    } else {
+        printf("Connected.\n");
+    }
+
+    // setup iperf
+    cyw43_arch_lwip_begin();
+    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
+    lwiperf_start_tcp_server_default(&iperf_report, NULL);
+    cyw43_arch_lwip_end();
+
+    // turn on bluetooth!
+    hci_power_control(HCI_POWER_ON);
+
+    // For threadsafe background we can just enter a loop
+    while(true) {
+        sleep_ms(1000);
+    }
+
+    cyw43_arch_deinit();
+    return 0;
+}
--- a/pico_w/bt/standalone/temp_sensor.gatt
+++ b/pico_w/bt/standalone/temp_sensor.gatt
@@ -0,0 +1,8 @@
+PRIMARY_SERVICE, GAP_SERVICE
+CHARACTERISTIC, GAP_DEVICE_NAME, READ, "picow_temp"
+
+PRIMARY_SERVICE, GATT_SERVICE
+CHARACTERISTIC, GATT_DATABASE_HASH, READ,
+
+PRIMARY_SERVICE, ORG_BLUETOOTH_SERVICE_ENVIRONMENTAL_SENSING
+CHARACTERISTIC, ORG_BLUETOOTH_CHARACTERISTIC_TEMPERATURE, READ | NOTIFY | INDICATE | DYNAMIC,
--- a/pico_w/bt/ublox_spp_le_counter/CMakeLists.txt
+++ b/pico_w/bt/ublox_spp_le_counter/CMakeLists.txt
@@ -0,0 +1 @@
+picow_bt_example(ublox_spp_le_counter)
--- a/pico_w/wifi/CMakeLists.txt
+++ b/pico_w/wifi/CMakeLists.txt
@@ -0,0 +1,25 @@
+set(WIFI_SSID "${WIFI_SSID}" CACHE INTERNAL "WiFi SSID for examples")
+set(WIFI_PASSWORD "${WIFI_PASSWORD}" CACHE INTERNAL "WiFi password for examples")
+
+add_subdirectory(blink)
+add_subdirectory(wifi_scan)
+add_subdirectory(access_point)
+
+if ("${WIFI_SSID}" STREQUAL "")
+    message("Skipping some Pico W examples as WIFI_SSID is not defined")
+elseif ("${WIFI_PASSWORD}" STREQUAL "")
+    message("Skipping some Pico W examples as WIFI_PASSWORD is not defined")
+else()
+    add_subdirectory(iperf)
+    add_subdirectory(ntp_client)
+    add_subdirectory(tcp_client)
+    add_subdirectory(tcp_server)
+    add_subdirectory(freertos)
+    add_subdirectory(udp_beacon)
+
+    if (NOT PICO_MBEDTLS_PATH)
+        message("Skipping tls examples as PICO_MBEDTLS_PATH is not defined")
+    else()
+        add_subdirectory(tls_client)
+    endif()
+endif()
--- a/pico_w/wifi/access_point/CMakeLists.txt
+++ b/pico_w/wifi/access_point/CMakeLists.txt
--- a/pico_w/wifi/access_point/dhcpserver/LICENSE
+++ b/pico_w/wifi/access_point/dhcpserver/LICENSE
--- a/pico_w/wifi/access_point/dhcpserver/dhcpserver.c
+++ b/pico_w/wifi/access_point/dhcpserver/dhcpserver.c
--- a/pico_w/wifi/access_point/dhcpserver/dhcpserver.h
+++ b/pico_w/wifi/access_point/dhcpserver/dhcpserver.h
--- a/pico_w/wifi/access_point/dnsserver/dnsserver.c
+++ b/pico_w/wifi/access_point/dnsserver/dnsserver.c
--- a/pico_w/wifi/access_point/dnsserver/dnsserver.h
+++ b/pico_w/wifi/access_point/dnsserver/dnsserver.h
--- a/pico_w/wifi/access_point/lwipopts.h
+++ b/pico_w/wifi/access_point/lwipopts.h
--- a/pico_w/wifi/access_point/picow_access_point.c
+++ b/pico_w/wifi/access_point/picow_access_point.c
@@ -311,11 +311,13 @@ int main() {
        // you do not need it in your code
 #if PICO_CYW43_ARCH_POLL
        // if you are using pico_cyw43_arch_poll, then you must poll periodically from your
-        // main loop (not from a timer) to check for WiFi driver or lwIP work that needs to be done.
+        // main loop (not from a timer interrupt) to check for Wi-Fi driver or lwIP work that needs to be done.
        cyw43_arch_poll();
-        sleep_ms(1);
+        // you can poll as often as you like, however if you have nothing else to do you can
+        // choose to sleep until either a specified time, or cyw43_arch_poll() has work to do:
+        cyw43_arch_wait_for_work_until(make_timeout_time_ms(1000));
 #else
-        // if you are not using pico_cyw43_arch_poll, then WiFI driver and lwIP work
+        // if you are not using pico_cyw43_arch_poll, then Wi-FI driver and lwIP work
        // is done via interrupt in the background. This sleep is just an example of some (blocking)
        // work you might be doing.
        sleep_ms(1000);
--- a/pico_w/wifi/blink/CMakeLists.txt
+++ b/pico_w/wifi/blink/CMakeLists.txt
--- a/pico_w/wifi/blink/picow_blink.c
+++ b/pico_w/wifi/blink/picow_blink.c
@@ -10,7 +10,7 @@
 int main() {
    stdio_init_all();
    if (cyw43_arch_init()) {
-        printf("WiFi init failed");
+        printf("Wi-Fi init failed");
        return -1;
    }
    while (true) {
--- a/pico_w/wifi/freertos/CMakeLists.txt
+++ b/pico_w/wifi/freertos/CMakeLists.txt
--- a/pico_w/wifi/freertos/FreeRTOS_Kernel_import.cmake
+++ b/pico_w/wifi/freertos/FreeRTOS_Kernel_import.cmake
@@ -0,0 +1,62 @@
+# This is a copy of <FREERTOS_KERNEL_PATH>/portable/ThirdParty/GCC/RP2040/FREERTOS_KERNEL_import.cmake
+
+# This can be dropped into an external project to help locate the FreeRTOS kernel
+# It should be include()ed prior to project(). Alternatively this file may
+# or the CMakeLists.txt in this directory may be included or added via add_subdirectory
+# respectively.
+
+if (DEFINED ENV{FREERTOS_KERNEL_PATH} AND (NOT FREERTOS_KERNEL_PATH))
+    set(FREERTOS_KERNEL_PATH $ENV{FREERTOS_KERNEL_PATH})
+    message("Using FREERTOS_KERNEL_PATH from environment ('${FREERTOS_KERNEL_PATH}')")
+endif ()
+
+set(FREERTOS_KERNEL_RP2040_RELATIVE_PATH "portable/ThirdParty/GCC/RP2040")
+# undo the above
+set(FREERTOS_KERNEL_RP2040_BACK_PATH "../../../..")
+
+if (NOT FREERTOS_KERNEL_PATH)
+    # check if we are inside the FreeRTOS kernel tree (i.e. this file has been included directly)
+    get_filename_component(_ACTUAL_PATH ${CMAKE_CURRENT_LIST_DIR} REALPATH)
+    get_filename_component(_POSSIBLE_PATH ${CMAKE_CURRENT_LIST_DIR}/${FREERTOS_KERNEL_RP2040_BACK_PATH}/${FREERTOS_KERNEL_RP2040_RELATIVE_PATH} REALPATH)
+    if (_ACTUAL_PATH STREQUAL _POSSIBLE_PATH)
+        get_filename_component(FREERTOS_KERNEL_PATH ${CMAKE_CURRENT_LIST_DIR}/${FREERTOS_KERNEL_RP2040_BACK_PATH} REALPATH)
+    endif()
+    if (_ACTUAL_PATH STREQUAL _POSSIBLE_PATH)
+        get_filename_component(FREERTOS_KERNEL_PATH ${CMAKE_CURRENT_LIST_DIR}/${FREERTOS_KERNEL_RP2040_BACK_PATH} REALPATH)
+        message("Setting FREERTOS_KERNEL_PATH to ${FREERTOS_KERNEL_PATH} based on location of FreeRTOS-Kernel-import.cmake")
+    elseif (PICO_SDK_PATH AND EXISTS "${PICO_SDK_PATH}/../FreeRTOS-Kernel")
+        set(FREERTOS_KERNEL_PATH ${PICO_SDK_PATH}/../FreeRTOS-Kernel)
+        message("Defaulting FREERTOS_KERNEL_PATH as sibling of PICO_SDK_PATH: ${FREERTOS_KERNEL_PATH}")
+    endif()
+endif ()
+
+if (NOT FREERTOS_KERNEL_PATH)
+    foreach(POSSIBLE_SUFFIX Source FreeRTOS-Kernel FreeRTOS/Source)
+        # check if FreeRTOS-Kernel exists under directory that included us
+        set(SEARCH_ROOT ${CMAKE_CURRENT_SOURCE_DIR}})
+        set(SEARCH_ROOT ../../../..)
+        get_filename_component(_POSSIBLE_PATH ${SEARCH_ROOT}/${POSSIBLE_SUFFIX} REALPATH)
+        if (EXISTS ${_POSSIBLE_PATH}/${FREERTOS_KERNEL_RP2040_RELATIVE_PATH}/CMakeLists.txt)
+            get_filename_component(FREERTOS_KERNEL_PATH ${_POSSIBLE_PATH} REALPATH)
+            message("Setting FREERTOS_KERNEL_PATH to '${FREERTOS_KERNEL_PATH}' found relative to enclosing project")
+            break()
+        endif()
+    endforeach()
+endif()
+
+if (NOT FREERTOS_KERNEL_PATH)
+    message(FATAL_ERROR "FreeRTOS location was not specified. Please set FREERTOS_KERNEL_PATH.")
+endif()
+
+set(FREERTOS_KERNEL_PATH "${FREERTOS_KERNEL_PATH}" CACHE PATH "Path to the FreeRTOS Kernel")
+
+get_filename_component(FREERTOS_KERNEL_PATH "${FREERTOS_KERNEL_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${FREERTOS_KERNEL_PATH})
+    message(FATAL_ERROR "Directory '${FREERTOS_KERNEL_PATH}' not found")
+endif()
+if (NOT EXISTS ${FREERTOS_KERNEL_PATH}/${FREERTOS_KERNEL_RP2040_RELATIVE_PATH}/CMakeLists.txt)
+    message(FATAL_ERROR "Directory '${FREERTOS_KERNEL_PATH}' does not contain an RP2040 port here: ${FREERTOS_KERNEL_RP2040_RELATIVE_PATH}")
+endif()
+set(FREERTOS_KERNEL_PATH ${FREERTOS_KERNEL_PATH} CACHE PATH "Path to the FreeRTOS_KERNEL" FORCE)
+
+add_subdirectory(${FREERTOS_KERNEL_PATH}/${FREERTOS_KERNEL_RP2040_RELATIVE_PATH} FREERTOS_KERNEL)
--- a/pico_w/wifi/freertos/iperf/CMakeLists.txt
+++ b/pico_w/wifi/freertos/iperf/CMakeLists.txt
--- a/pico_w/wifi/freertos/iperf/FreeRTOSConfig.h
+++ b/pico_w/wifi/freertos/iperf/FreeRTOSConfig.h
--- a/pico_w/wifi/freertos/iperf/lwipopts.h
+++ b/pico_w/wifi/freertos/iperf/lwipopts.h
--- a/pico_w/wifi/freertos/iperf/picow_freertos_iperf.c
+++ b/pico_w/wifi/freertos/iperf/picow_freertos_iperf.c
@@ -62,7 +62,7 @@ void main_task(__unused void *params) {
        return;
    }
    cyw43_arch_enable_sta_mode();
-    printf("Connecting to WiFi...\n");
+    printf("Connecting to Wi-Fi...\n");
    if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASSWORD, CYW43_AUTH_WPA2_AES_PSK, 30000)) {
        printf("failed to connect.\n");
        exit(1);
@@ -72,6 +72,7 @@ void main_task(__unused void *params) {

    xTaskCreate(blink_task, "BlinkThread", configMINIMAL_STACK_SIZE, NULL, BLINK_TASK_PRIORITY, NULL);

+    cyw43_arch_lwip_begin();
 #if CLIENT_TEST
    printf("\nReady, running iperf client\n");
    ip_addr_t clientaddr;
@@ -81,10 +82,11 @@ void main_task(__unused void *params) {
    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
    lwiperf_start_tcp_server_default(&iperf_report, NULL);
 #endif
+    cyw43_arch_lwip_end();

    while(true) {
        // not much to do as LED is in another task, and we're using RAW (callback) lwIP API
-        vTaskDelay(100);
+        vTaskDelay(10000);
    }

    cyw43_arch_deinit();
--- a/pico_w/wifi/freertos/ping/CMakeLists.txt
+++ b/pico_w/wifi/freertos/ping/CMakeLists.txt
--- a/pico_w/wifi/freertos/ping/FreeRTOSConfig.h
+++ b/pico_w/wifi/freertos/ping/FreeRTOSConfig.h
--- a/pico_w/wifi/freertos/ping/lwipopts.h
+++ b/pico_w/wifi/freertos/ping/lwipopts.h
@@ -0,0 +1,21 @@
+#ifndef _LWIPOPTS_H
+#define _LWIPOPTS_H
+
+// Generally you would define your own explicit list of lwIP options
+// (see https://www.nongnu.org/lwip/2_1_x/group__lwip__opts.html)
+//
+// This example uses a common include to avoid repetition
+#include "lwipopts_examples_common.h"
+
+#if !NO_SYS
+#define TCPIP_THREAD_STACKSIZE 1024
+#define DEFAULT_THREAD_STACKSIZE 1024
+#define DEFAULT_RAW_RECVMBOX_SIZE 8
+#define TCPIP_MBOX_SIZE 8
+#define LWIP_TIMEVAL_PRIVATE 0
+
+// not necessary, can be done either way
+#define LWIP_TCPIP_CORE_LOCKING_INPUT 1
+#endif
+
+#endif
--- a/pico_w/wifi/freertos/ping/picow_freertos_ping.c
+++ b/pico_w/wifi/freertos/ping/picow_freertos_ping.c
@@ -28,7 +28,7 @@ void main_task(__unused void *params) {
        return;
    }
    cyw43_arch_enable_sta_mode();
-    printf("Connecting to WiFi...\n");
+    printf("Connecting to Wi-Fi...\n");
    if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASSWORD, CYW43_AUTH_WPA2_AES_PSK, 30000)) {
        printf("failed to connect.\n");
        exit(1);
--- a/pico_w/wifi/iperf/CMakeLists.txt
+++ b/pico_w/wifi/iperf/CMakeLists.txt
@@ -14,7 +14,6 @@ target_link_libraries(picow_iperf_server_background
        pico_stdlib
        pico_lwip_iperf
        )
-
 pico_add_extra_outputs(picow_iperf_server_background)

 add_executable(picow_iperf_server_poll
--- a/pico_w/wifi/iperf/lwipopts.h
+++ b/pico_w/wifi/iperf/lwipopts.h
--- a/pico_w/wifi/iperf/picow_iperf.c
+++ b/pico_w/wifi/iperf/picow_iperf.c
@@ -44,7 +44,7 @@ int main() {
        return 1;
    }
    cyw43_arch_enable_sta_mode();
-    printf("Connecting to WiFi...\n");
+    printf("Connecting to Wi-Fi...\n");
    if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASSWORD, CYW43_AUTH_WPA2_AES_PSK, 30000)) {
        printf("failed to connect.\n");
        return 1;
@@ -52,6 +52,7 @@ int main() {
        printf("Connected.\n");
    }

+    cyw43_arch_lwip_begin();
 #if CLIENT_TEST
    printf("\nReady, running iperf client\n");
    ip_addr_t clientaddr;
@@ -61,6 +62,7 @@ int main() {
    printf("\nReady, running iperf server at %s\n", ip4addr_ntoa(netif_ip4_addr(netif_list)));
    lwiperf_start_tcp_server_default(&iperf_report, NULL);
 #endif
+    cyw43_arch_lwip_end();

    while(true) {
 #if USE_LED
@@ -83,9 +85,11 @@ int main() {
        // you do not need it in your code
 #if PICO_CYW43_ARCH_POLL
        // if you are using pico_cyw43_arch_poll, then you must poll periodically from your
-        // main loop (not from a timer) to check for WiFi driver or lwIP work that needs to be done.
+        // main loop (not from a timer interrupt) to check for Wi-Fi driver or lwIP work that needs to be done.
        cyw43_arch_poll();
-        sleep_ms(1);
+        // you can poll as often as you like, however if you have nothing else to do you can
+        // choose to sleep until either a specified time, or cyw43_arch_poll() has work to do:
+        cyw43_arch_wait_for_work_until(led_time);
 #else
        // if you are not using pico_cyw43_arch_poll, then WiFI driver and lwIP work
        // is done via interrupt in the background. This sleep is just an example of some (blocking)
--- a/pico_w/wifi/lwipopts_examples_common.h
+++ b/pico_w/wifi/lwipopts_examples_common.h
--- a/pico_w/wifi/ntp_client/CMakeLists.txt
+++ b/pico_w/wifi/ntp_client/CMakeLists.txt
--- a/Show More
+++ b/Show More
				`@@ -0,0 +1 @@`
				`picow_bt_example(a2dp_source_demo pico_btstack_hxcmod_player pico_btstack_sbc_encoder)`
				`@@ -0,0 +1 @@`
				`picow_bt_example(gatt_device_information_query)`
				`@@ -0,0 +1 @@`
				`picow_bt_example(hfp_ag_demo pico_btstack_sco_demo_util pico_btstack_sbc_encoder)`
				`@@ -0,0 +1 @@`
				`picow_bt_example(hfp_hf_demo pico_btstack_sco_demo_util pico_btstack_sbc_encoder)`
				`@@ -0,0 +1 @@`
				`picow_bt_example(hsp_ag_demo pico_btstack_sco_demo_util pico_btstack_sbc_encoder)`
				`@@ -0,0 +1 @@`
				`picow_bt_example(hsp_hs_demo pico_btstack_sco_demo_util pico_btstack_sbc_encoder)`
				`@@ -0,0 +1 @@`
				`picow_bt_example(le_credit_based_flow_control_mode_client)`
				`@@ -0,0 +1 @@`
				`picow_bt_example(mod_player pico_btstack_hxcmod_player)`