Ajout de la fonction UDP beacon

picow_access_point.c

@@ -42,6 +42,51 @@ typedef struct TCP_CONNECT_STATE_T_ {
     ip_addr_t *gw;
 } TCP_CONNECT_STATE_T;
 
+
+
+#define UDP_PORT 47269
+#define BEACON_MSG_LEN_MAX 127
+#define BEACON_TARGET "192.168.4.16"
+#define BEACON_INTERVAL_MS 1000
+
+void run_udp_beacon() {
+    struct udp_pcb* pcb = udp_new();
+
+    ip_addr_t addr;
+    ipaddr_aton(BEACON_TARGET, &addr);
+
+    int counter = 0;
+    while (true) {
+        struct pbuf *p = pbuf_alloc(PBUF_TRANSPORT, BEACON_MSG_LEN_MAX+1, PBUF_RAM);
+        char *req = (char *)p->payload;
+        memset(req, 0, BEACON_MSG_LEN_MAX+1);
+        snprintf(req, BEACON_MSG_LEN_MAX, "counter:%d\n", counter);
+        err_t er = udp_sendto(pcb, p, &addr, UDP_PORT);
+        pbuf_free(p);
+        if (er != ERR_OK) {
+            printf("Failed to send UDP packet! error=%d\n", er);
+        } else {
+            printf("Sent packet %d\n", counter);
+            counter++;
+        }
+
+        // Note in practice for this simple UDP transmitter,
+        // the end result for both background and poll is the same
+
+#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 Wi-Fi driver or lwIP work that needs to be done.
+        cyw43_arch_poll();
+        sleep_ms(BEACON_INTERVAL_MS);
+#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(BEACON_INTERVAL_MS);
+#endif
+    }
+}
+
 static err_t tcp_close_client_connection(TCP_CONNECT_STATE_T *con_state, struct tcp_pcb *client_pcb, err_t close_err) {
     if (client_pcb) {
         assert(con_state && con_state->pcb == client_pcb);
@@ -333,6 +378,7 @@ int main() {
 
     state->complete = false;
     while(!state->complete) {
+        run_udp_beacon();
         // 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