* nrf52 BLE, increased MTU to 250

src/helpers/nrf52/SerialBLEInterface.cpp

@@ -1,12 +1,11 @@
 #include "SerialBLEInterface.h"
 
 void SerialBLEInterface::begin(const char* device_name, uint32_t pin_code) {
-  _pin_code = pin_code;
   char charpin[20];
-  sprintf(charpin, "%d", _pin_code);
+  sprintf(charpin, "%d", pin_code);
 
   Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);
-
+  Bluefruit.configPrphConn(250, BLE_GAP_EVENT_LENGTH_MIN, 16, 16);  // increase MTU
   Bluefruit.begin();
   Bluefruit.setTxPower(4);    // Check bluefruit.h for supported values
   Bluefruit.setName(device_name);

src/helpers/nrf52/SerialBLEInterface.h

@@ -9,7 +9,6 @@ class SerialBLEInterface : public BaseSerialInterface {
   bool oldDeviceConnected;
   bool checkAdvRestart;
   bool _isEnabled;
-  uint32_t _pin_code;
   unsigned long _last_write;
 
   struct Frame {