Add Bluetooth examples

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

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;
+}