#include <M5Stack.h>


void setup() {

  M5.begin();
  M5.Power.begin();
  Serial.begin(115200);

  // Serial2.begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin, bool invert)
  Serial2.begin(115200, SERIAL_8N1, 16, 17);
  pinMode(5, OUTPUT);
  digitalWrite(5, 1);
}

void loop() {

 if(Serial.available()) {
   int ch = Serial.read();
   Serial2.write(ch);
 }

 if(Serial2.available()) {
   int ch = Serial2.read();
   Serial.write(ch);
 }
}