Fix #1434 - set will QoS in CONNECT message correctly, and rename qos -> will_qos in struct mg_mqtt_opts

examples/mqtt-client-aws-iot/main.c

@@ -80,7 +80,7 @@ static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
 
 int main(void) {
   struct mg_mgr mgr;
-  struct mg_mqtt_opts opts = {.qos = s_qos};
+  struct mg_mqtt_opts opts = {.clean = true};
   bool done = false;
   mg_mgr_init(&mgr);                               // Initialise event manager
   LOG(LL_INFO, ("Connecting to %s", s_url));       // Inform that we're starting

examples/mqtt-client/main.c

@@ -65,7 +65,8 @@ static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
 // Timer function - recreate client connection if it is closed
 static void timer_fn(void *arg) {
   struct mg_mgr *mgr = (struct mg_mgr *) arg;
-  struct mg_mqtt_opts opts = {.qos = s_qos,
+  struct mg_mqtt_opts opts = {.clean = true,
+                              .will_qos = s_qos,
                               .will_topic = mg_str(s_pub_topic),
                               .will_message = mg_str("goodbye")};
   if (s_conn == NULL) s_conn = mg_mqtt_connect(mgr, s_url, &opts, fn, NULL);

examples/mqtt-over-ws-client/main.c

@@ -28,7 +28,7 @@ static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
   } else if (ev == MG_EV_WS_OPEN) {
     // WS connection established. Perform MQTT login
     LOG(LL_INFO, ("Connected to WS. Logging in to MQTT..."));
-    struct mg_mqtt_opts opts = {.qos = 1,
+    struct mg_mqtt_opts opts = {.will_qos = 1,
                                 .will_topic = mg_str(s_topic),
                                 .will_message = mg_str("goodbye")};
     size_t len = c->send.len;