Heltec v4: Add cli command to toggle gpio48

variants/heltec_v4/HeltecV4Board.cpp

@@ -16,6 +16,10 @@ void HeltecV4Board::begin() {
     pinMode(P_LORA_PA_TX_EN, OUTPUT);
     digitalWrite(P_LORA_PA_TX_EN,LOW);
 
+    #ifdef PIN_GPIO
+    pinMode(PIN_GPIO, OUTPUT);
+    digitalWrite(PIN_GPIO, LOW);
+    #endif
 
     periph_power.begin();
 

variants/heltec_v4/platformio.ini

@@ -40,6 +40,7 @@ build_flags =
   -D ENV_INCLUDE_GPS=1
   -D PIN_ADC_CTRL=37
   -D PIN_VBAT_READ=1
+  -D PIN_GPIO=48
 build_src_filter = ${esp32_base.build_src_filter}
   +<../variants/heltec_v4>
   +<helpers/sensors>