Add Bluetooth examples

Co-authored-by: Peter Harper <77111776+peterharperuk@users.noreply.github.com>

pico_w/wifi/iperf/CMakeLists.txt

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+add_executable(picow_iperf_server_background
+        picow_iperf.c
+        )
+target_compile_definitions(picow_iperf_server_background PRIVATE
+        WIFI_SSID=\"${WIFI_SSID}\"
+        WIFI_PASSWORD=\"${WIFI_PASSWORD}\"
+        )
+target_include_directories(picow_iperf_server_background PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+        ${CMAKE_CURRENT_LIST_DIR}/.. # for our common lwipopts
+        )
+target_link_libraries(picow_iperf_server_background
+        pico_cyw43_arch_lwip_threadsafe_background
+        pico_stdlib
+        pico_lwip_iperf
+        )
+pico_add_extra_outputs(picow_iperf_server_background)
+
+add_executable(picow_iperf_server_poll
+        picow_iperf.c
+        )
+target_compile_definitions(picow_iperf_server_poll PRIVATE
+        WIFI_SSID=\"${WIFI_SSID}\"
+        WIFI_PASSWORD=\"${WIFI_PASSWORD}\"
+        )
+target_include_directories(picow_iperf_server_poll PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+        ${CMAKE_CURRENT_LIST_DIR}/.. # for our common lwipopts
+        )
+target_link_libraries(picow_iperf_server_poll
+        pico_cyw43_arch_lwip_poll
+        pico_stdlib
+        pico_lwip_iperf
+        )
+pico_add_extra_outputs(picow_iperf_server_poll)
+

pico_w/wifi/iperf/lwipopts.h

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+#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"
+
+#endif

pico_w/wifi/iperf/picow_iperf.c

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+/**
+ * Copyright (c) 2022 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "pico/cyw43_arch.h"
+#include "pico/stdlib.h"
+
+#include "lwip/netif.h"
+#include "lwip/ip4_addr.h"
+#include "lwip/apps/lwiperf.h"
+
+#ifndef USE_LED
+#define USE_LED 1
+#endif
+
+#if CLIENT_TEST && !defined(IPERF_SERVER_IP)
+#error IPERF_SERVER_IP not defined
+#endif
+
+// 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);
+#if CYW43_USE_STATS
+    printf("packets in %u packets out %u\n", CYW43_STAT_GET(PACKET_IN_COUNT), CYW43_STAT_GET(PACKET_OUT_COUNT));
+#endif
+}
+
+int main() {
+    stdio_init_all();
+
+    if (cyw43_arch_init()) {
+        printf("failed to initialise\n");
+        return 1;
+    }
+    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");
+    }
+
+    cyw43_arch_lwip_begin();
+#if CLIENT_TEST
+    printf("\nReady, running iperf client\n");
+    ip_addr_t clientaddr;
+    ip4_addr_set_u32(&clientaddr, ipaddr_addr(xstr(IPERF_SERVER_IP)));
+    assert(lwiperf_start_tcp_client_default(&clientaddr, &iperf_report, NULL) != NULL);
+#else
+    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
+        static absolute_time_t led_time;
+        static int led_on = true;
+
+        // Invert the led
+        if (absolute_time_diff_us(get_absolute_time(), led_time) < 0) {
+            led_on = !led_on;
+            cyw43_gpio_set(&cyw43_state, 0, led_on);
+            led_time = make_timeout_time_ms(1000);
+
+            // Check we can read back the led value
+            bool actual_led_val = !led_on;
+            cyw43_gpio_get(&cyw43_state, 0, &actual_led_val);
+            assert(led_on == actual_led_val);
+        }
+#endif
+        // the following #ifdef is only here so this same example can be used in multiple modes;
+        // 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 interrupt) to check for Wi-Fi driver or lwIP work that needs to be done.
+        cyw43_arch_poll();
+        // 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)
+        // work you might be doing.
+        sleep_ms(1000);
+#endif
+    }
+
+    cyw43_arch_deinit();
+    return 0;
+}