Tweaking Power FSM states (#2676)

* Tweaking Power FSM states

* Turn bluetooth back on after serial disconnected

* Remove references to deprecated mesh_sds_timeout_secs

src/PowerFSM.cpp

@@ -146,7 +146,10 @@ static void nbEnter()
 {
     LOG_DEBUG("Enter state: NB\n");
     screen->setOn(false);
+#ifdef ARCH_ESP32
+    // Only ESP32 should turn off bluetooth
     setBluetoothEnable(false);
+#endif
 
     // FIXME - check if we already have packets for phone and immediately trigger EVENT_PACKETS_FOR_PHONE
 }
@@ -167,6 +170,8 @@ static void serialEnter()
 
 static void serialExit()
 {
+    // Turn bluetooth back on when we leave serial stream API
+    setBluetoothEnable(true);
     screen->print("Serial disconnected\n");
 }
 
@@ -251,7 +256,11 @@ void PowerFSM_setup()
 
     // wake timer expired or a packet arrived
     // if we are a router node, we go to NB (no need for bluetooth) otherwise we go to DARK (so we can send message to phone)
+#ifdef ARCH_ESP32
     powerFSM.add_transition(&stateLS, isRouter ? &stateNB : &stateDARK, EVENT_WAKE_TIMER, NULL, "Wake timer");
+#else // Don't go into a no-bluetooth state on low power platforms
+    powerFSM.add_transition(&stateLS, &stateDARK, EVENT_WAKE_TIMER, NULL, "Wake timer");
+#endif
 
     // We need this transition, because we might not transition if we were waiting to enter light-sleep, because when we wake from
     // light sleep we _always_ transition to NB or dark and