Use wakeup handler to reschedule fallback alarm

src/c/gentlewake.c

@@ -18,8 +18,8 @@ WakeupId wakeup_schedule_simple_robust(time_t wakeup_time, int8_t retry_diff, bo
 
 		if (result == E_RANGE) {
 			// E_RANGE means some other app has the same wakeup time +/- 1 minute, so try to set
-			// the wakeup for a time up to (retry_diff * 5) minutes before/after.
-			while (result == E_RANGE && try_count++ < 5) {
+			// the wakeup for a time up to (retry_diff * 8) minutes before/after.
+			while (result == E_RANGE && try_count++ < 8) {
 				wakeup_time += retry_diff;
 				result = wakeup_schedule(wakeup_time, is_fallback, true);
 			}

src/c/main.c

@@ -157,11 +157,6 @@ static void add_bar_layers_to_window(Layer *window_layer, bool small_top) {
 ////////////////////// ALARM //////////////////////
 
 static void alarm_seconds_handler(struct tm *tick_time, TimeUnits units_changed) {
-	// re-schedule fallback alarm every 15 seconds
-	if (tick_time->tm_sec % 15 == 0) {
-		schedule_alarm(true); // output is not captured, as it is not actionable
-	}
-
 	// update stopwatch
 	if (s_stopwatch_time[1] == 59) {
 		s_stopwatch_time[1] = 0;
@@ -259,7 +254,15 @@ static void drop_menu_window_unload(Window *window) {
 	s_drop_menu_layer = NULL;
 }
 
+static void live_wakeup_handler_for_alarm(WakeupId id, int32_t reason) {
+	if (reason == 1) {        // if fallback alarm, re-schedule it
+		schedule_alarm(true); // output is not captured, as it is not actionable
+	}
+}
+
 static void alarm_window_load() {
+	wakeup_service_subscribe(live_wakeup_handler_for_alarm);
+
 	Layer *window_layer = window_get_root_layer(s_window);
 
 	// change highlight color to avoid changing color of bottom bar