Merge remote-tracking branch 'upstream/dev' into rak-ethernet

# Conflicts:
#	examples/companion_radio/main.cpp

examples/simple_repeater/main.cpp

@@ -41,6 +41,10 @@ void setup() {
 
   board.begin();
 
+#ifdef HAS_EXTERNAL_WATCHDOG
+  external_watchdog.begin();
+#endif
+
 #if defined(MESH_DEBUG) && defined(NRF52_PLATFORM)
   // give some extra time for serial to settle so
   // boot debug messages can be seen on terminal
@@ -188,7 +192,13 @@ void loop() {
 #endif
   rtc_clock.tick();
 
+#ifdef HAS_EXTERNAL_WATCHDOG
+  external_watchdog.loop();
+#endif
   if (the_mesh.getNodePrefs()->powersaving_enabled && !the_mesh.hasPendingWork()) {
+#ifdef HAS_EXTERNAL_WATCHDOG
+    external_watchdog.feed();
+#endif
 #if defined(NRF52_PLATFORM)
     board.sleep(0); // nrf ignores seconds param, sleeps whenever possible
 #else