Connection p2p with two RN2483 and LoRaWan gateway

HI @a.valero, I have followed your tip and it is the same, I don't get the message back,I am quite puzzled by the fact that the answer to radio tx is none of the standard values, but a number is that normal?

TX is now

  String text = "Node zero";
  String e = "zero";

  text = "Node " + nodeAddress + " sending: " + message;
  Serial.println(text);
  //using the LoRa modulation to reach other node instead the LoRaWan stack
  //stopping the LoRaWan stack on the device
  Serial.print("Pausing mac: ");
  e = Serial1.write("mac pause\r\n");
  Serial.println(e);
  Serial.print("sending to radio: ");
  e = Serial1.write("radio tx 1\r\n");
  Serial.println(e);

  Serial1.print(message);

whose outcome is
Node 02010102 sending: HI
Pausing mac: 11
sending to radio: 12
LoRa status:
Node 02010102 sending: HI
Pausing mac: 11
sending to radio: 12
LoRa status:
Node 02010102 sending: HI
...

RX is now

  String str;
  char rx[2];
  int e = -1;

  Serial1.begin(57600);
  while (!Serial1);

  Serial1.println("mac pause\r\n");
  //setting window to zero
  Serial1.println("radio set wdt 0\r\n");
  //setting the rx to continous mode of reception
  Serial1.println("radio rx 0\r\n");
  if (Serial1.available() > 0) {
    // read the incoming byte:
    Serial1.readBytesUntil('\n', rx, 2);

    // say what you got:
    Serial.print("Comming to node " + nodeAddress + " serial: ");
    Serial.println(rx);

and the outcome

Comming to node 02010103 serial: 42
Comming to node 02010103 serial: 94
Comming to node 02010103 serial: 96
Comming to node 02010103 serial: 72
Comming to node 02010103 serial: 45
Comming to node 02010103 serial: %