Improve repeater reliability and build tooling

examples/simple_room_server/main.cpp

@@ -127,6 +127,9 @@ void loop() {
 #endif
   if (the_mesh.getNodePrefs()->powersaving_enabled && !board.isUsbDataConnected()) {
     uint32_t sleep_secs = the_mesh.getPowerSaveSleepSeconds(30);
+#ifdef HAS_EXTERNAL_WATCHDOG
+    if (sleep_secs > 0) external_watchdog.feed();
+#endif
 #if defined(NRF52_PLATFORM)
     if (sleep_secs > 0) {
       board.sleep(0); // nrf ignores seconds param, sleeps whenever possible