* new helper: AutoDiscoverRTCClock, which detects: DS3231 (on i2c addr 0x68), or RV3028 (on i2c addr 0x52)

* repeater and room server: ver bump (v5), now use AutoDiscoverRTCClock
* various Board::begin() now should do Wire.begin(), with custom pin mappings if needed
* examples removed: ping client/server, and test_admin

src/helpers/nrf52/RAK4631Board.h

@@ -25,17 +25,7 @@ protected:
   uint8_t startup_reason;
 
 public:
-  void begin() {
-    // for future use, sub-classes SHOULD call this from their begin()
-    startup_reason = BD_STARTUP_NORMAL;
-
-    pinMode(PIN_VBAT_READ, INPUT);
-
-    pinMode(SX126X_POWER_EN, OUTPUT);
-    digitalWrite(SX126X_POWER_EN, HIGH);
-    delay(10);   // give sx1262 some time to power up
-  }
-
+  void begin();
   uint8_t getStartupReason() const override { return startup_reason; }
 
   #define BATTERY_SAMPLES 8