12. Networking and communications

Code from one project;

void setup() {
  // initialize both serial ports:
  Serial.begin(115200);
  //Serial0.begin(115200);
  Serial1.begin(115200, SERIAL_8N1, D7, D6); 
}

void loop() {
  // read from port 1, send to port 0:
  if (Serial1.available()) {
    // int inByte = Serial0.read();
    String s =Serial1.readString();
    delay(50); 
    // Serial.write(inByte);
    Serial.println(s);
  //}

  // read from port 0, send to port 1:
  // if (Serial.available()) {
    // int inByte = Serial.read();
    // Serial0.write(inByte);
    String t =Serial.readString();
    delay(50); 
  Serial1.println("katoh");
  }
}

Code from the other Project;