#include <BLE.h>
    void setup() {
      Serial.begin(115200);
      ble.begin();
      ble.serial();
      ble.setAdvertName("Energia Serial");
      ble.startAdvert();
    }
    void loop() {
      ble.handleEvents();
      if (Serial.available())
      {
        ble.print(Serial.readString());
      }
      if (ble.available())
      {
        /* All the Serial functions are available with BLE serial. */
        Serial.println(ble.readString());
      }
    }