First start of MQTT buttons

src/widget.c

@@ -81,6 +81,8 @@ struct widget_t *widget_create_from_json(const char *json) {
   widget->type=type;
   widget->label=label;
   widget->img=img;
+
+  // Load widget-specific attributes
   if (type == WIDGET_TYPE_LOADSCREEN) {
     if (json_scanf(json, strlen(json), "{screen:%Q}", &screen) != 1) {
       LOG(LL_WARN, ("Widget '%s' is of type LOADSCREEN but does not have attribute 'screen'", widget->name));
@@ -88,6 +90,22 @@ struct widget_t *widget_create_from_json(const char *json) {
       if (widget->user_data) free(widget->user_data);
       widget->user_data = screen;
     }
+  } else if (type == WIDGET_TYPE_MQTT_BUTTON) {
+    void *h = NULL;
+    char *mqtt = NULL;
+    struct json_token val;
+    int idx;
+
+    if (json_scanf(json, strlen(json), "{mqtt:%Q}", &mqtt) != 1) {
+      LOG(LL_WARN, ("Widget '%s' is of type MQTT_BUTTON but does not have attribute 'mqtt'", widget->name));
+    } else {
+      while ((h = json_next_elem(json, strlen(json), h, ".mqtt", &idx, &val)) != NULL) {
+        LOG(LL_INFO, ("[%d]: [%.*s]", idx, val.len, val.ptr));
+        if (val.len>0 && val.ptr) {
+        }
+      }
+      if(mqtt) free(mqtt);
+    }
   }
 
   return widget;

src/widget_default.c

@@ -78,6 +78,7 @@ void screen_add_default_widgets(struct screen_t *screen) {
 
 static void widget_default_loadscreen(struct widget_t *w, void *ev_data) {
   struct screen_t *new_screen;
+  char *new_screen_fn;
 
   if (!w)
     return;
@@ -86,8 +87,12 @@ static void widget_default_loadscreen(struct widget_t *w, void *ev_data) {
     return;
   }
 
+  new_screen_fn=strdup(w->user_data);
+
+  screen_destroy(&s_screen);
+  new_screen = screen_create_from_file(new_screen_fn, widget_default_ev, NULL);
+  free(new_screen_fn);
 
-  new_screen = screen_create_from_file(w->user_data, widget_default_ev, NULL);
   if (!new_screen) {
     LOG(LL_ERROR, ("Could not load screen"));
     return;
@@ -95,7 +100,6 @@ static void widget_default_loadscreen(struct widget_t *w, void *ev_data) {
   screen_add_default_widgets(new_screen);
 
   LOG(LL_INFO, ("Navigating to new screen '%s' which has %d widgets", new_screen->name, screen_get_num_widgets(new_screen)));
-  screen_destroy(&s_screen);
   s_screen = new_screen;
   screen_widget_broadcast(s_screen, EV_WIDGET_DRAW, NULL);
 
@@ -109,7 +113,7 @@ void widget_default_ev(int ev, struct widget_t *w, void *ev_data) {
     return;
   widget_ev_to_str(ev, evname, sizeof(evname)-1);
 
-  LOG(LL_INFO, ("Event %s received for widget '%s'", evname, w->name));
+  LOG(LL_DEBUG, ("Event %s received for widget '%s'", evname, w->name));
 
   switch(ev) {
     case EV_WIDGET_CREATE:

src/widget_network.c

@@ -7,6 +7,9 @@ static mgos_timer_id recv_timer = 0;
 static struct widget_t *widget_network = NULL;
 
 static void widget_network_render(struct widget_t *w, void *ev_data) {
+  if (!w)
+    return;
+
   mgos_ili9341_set_window(w->x, w->y, w->x+w->w-1, w->y+w->h-1);
   // Send
   mgos_ili9341_set_fgcolor565(send_timer?ILI9341_YELLOW:ILI9341_DARKGREY);
@@ -34,8 +37,10 @@ static void widget_network_recv_clear(void *arg) {
 }
 
 void widget_network_send() {
-  if (!widget_network)
+  if (!widget_network) {
+    LOG(LL_ERROR, ("called without widget_network set"));
     return;
+  }
 
   if (!send_timer)
     send_timer=mgos_set_timer(100, 0, widget_network_send_clear, NULL);
@@ -43,8 +48,10 @@ void widget_network_send() {
 }
 
 void widget_network_recv() {
-  if (!widget_network)
+  if (!widget_network) {
+    LOG(LL_ERROR, ("called without widget_network set"));
     return;
+  }
 
   if (!recv_timer)
     recv_timer=mgos_set_timer(100, 0, widget_network_recv_clear, NULL);
@@ -52,12 +59,18 @@ void widget_network_recv() {
 }
 
 void widget_network_ev(int ev, struct widget_t *w, void *ev_data) {
+  char evname[15];
   if (!w)
     return;
 
+  widget_ev_to_str(ev, evname, sizeof(evname)-1);
+  LOG(LL_DEBUG, ("Event %s received for widget '%s'", evname, w->name));
+
   switch(ev) {
     case EV_WIDGET_CREATE:
       widget_network=w;
+      send_timer=0;
+      recv_timer=0;
       break;
     case EV_WIDGET_DRAW:
     case EV_WIDGET_REDRAW:
@@ -65,7 +78,11 @@ void widget_network_ev(int ev, struct widget_t *w, void *ev_data) {
       break;
     case EV_WIDGET_DESTROY:
       widget_network=NULL;
+      if (send_timer)
+        mgos_clear_timer(send_timer);
       send_timer=0;
+      if (recv_timer)
+        mgos_clear_timer(recv_timer);
       recv_timer=0;
       break;
     case EV_WIDGET_TIMER: