Add an external watchdog module

examples/simple_repeater/main.cpp

@@ -29,6 +29,10 @@ void setup() {
 
   board.begin();
 
+#ifdef HAS_EX_WATCHDOG
+  ex_watchdog.begin();
+#endif
+
   // For power saving
   lastActive = millis(); // mark last active time since boot
 
@@ -124,11 +128,17 @@ void loop() {
   ui_task.loop();
 #endif
   rtc_clock.tick();
-
+#ifdef HAS_EX_WATCHDOG
+  ex_watchdog.loop();
+#endif
   if (the_mesh.getNodePrefs()->powersaving_enabled &&                     // To check if power saving is enabled
       the_mesh.millisHasNowPassed(lastActive + nextSleepinSecs * 1000)) { // To check if it is time to sleep
     if (!the_mesh.hasPendingWork()) { // No pending work. Safe to sleep
+#ifdef HAS_EX_WATCHDOG
+      board.sleep(ex_watchdog.getIntervalMs()>1800?1800:ex_watchdog.getIntervalMs());             // To sleep. Wake up after 30 minutes or when receiving a LoRa packet
+#else
       board.sleep(1800);             // To sleep. Wake up after 30 minutes or when receiving a LoRa packet
+#endif
       lastActive = millis();
       nextSleepinSecs = 5;  // Default: To work for 5s and sleep again
     } else {