* some fixes around the powerOff(). Tidy ups

examples/companion_radio/UITask.cpp

@@ -26,7 +26,6 @@ static const uint8_t meshcore_logo [] PROGMEM = {
 };
 
 void UITask::begin(const char* node_name, const char* build_date, uint32_t pin_code) {
-  _prevBtnState = HIGH;
   _auto_off = millis() + AUTO_OFF_MILLIS;
   clearMsgPreview();
   _node_name = node_name;
@@ -66,7 +65,8 @@ void UITask::newMsg(uint8_t path_len, const char* from_name, const char* text, i
 }
 
 void UITask::renderCurrScreen() {
-  if (_display != NULL) {
+  if (_display == NULL) return;  // assert() ??
+
   char tmp[80];
   if (_origin[0] && _msg[0]) {
     // render message preview
@@ -105,7 +105,6 @@ void UITask::renderCurrScreen() {
     }
   }
 }
-}
 
 void UITask::userLedHandler() {
 #ifdef PIN_STATUS_LED
@@ -135,7 +134,7 @@ void UITask::userLedHandler() {
 
 void UITask::buttonHandler() {
 #ifdef PIN_USER_BTN
-  static int prev_btn_state = HIGH;
+  static int prev_btn_state = !USER_BTN_PRESSED;
   static unsigned long btn_state_change_time = 0;
   static unsigned long next_read = 0;
   int cur_time = millis();
@@ -153,7 +152,6 @@ void UITask::buttonHandler() {
         }
       } else { // unpressed ? check pressed time ...
         if ((cur_time - btn_state_change_time) > 5000) {
-          Serial.println("power off");
         #ifdef PIN_STATUS_LED
           digitalWrite(PIN_STATUS_LED, LOW);
           delay(10);

examples/companion_radio/UITask.h

@@ -7,7 +7,6 @@ class UITask {
   DisplayDriver* _display;
   mesh::MainBoard* _board;
   unsigned long _next_refresh, _auto_off;
-  int _prevBtnState;
   bool _connected;
   uint32_t _pin_code;
   const char* _node_name;

src/MeshCore.h

@@ -40,7 +40,7 @@ public:
   virtual void onBeforeTransmit() { }
   virtual void onAfterTransmit() { }
   virtual void reboot() = 0;
-  virtual void powerOff() { while (1) { }}; // hope it's overriden or never called ;)
+  virtual void powerOff() { /* no op */ }
   virtual uint8_t getStartupReason() const = 0;
   virtual bool startOTAUpdate() { return false; }   // not supported
 };

src/helpers/HeltecV3Board.h

@@ -68,7 +68,8 @@ public:
   }
 
   void powerOff() override {
-    enterDeepSleep(0);
+    // TODO: re-enable this when there is a definite wake-up source pin:
+    //  enterDeepSleep(0);
   }
 
   uint16_t getBattMilliVolts() override {