[Arduino source code for MB]-02 debug 4G module AT command

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Code:

void setup() {
  Serial.begin(115200);
  Serial2.begin(115200);
}

void loop() {
  while (Serial.available()) {
    //  delay(1);
      Serial2.write(Serial.read());
  }
  while (Serial2.available()) {
       Serial.write(Serial2.read());
  }
}