LoRabee RN2483 sleep and wake up

Hi, from the RN2483 documentation I understand it is possible to get the RN2483 module in power down mode, and to wake it up by sending some special command.

I tried the following code to test this:

loraSerial.write(“sys sleep 10000”);
delay(200);
loraSerial.write(0x55);

when I try to send something using the following code I get an internal error.
switch (LoRaBee.send( 1, (uint8_t*)reading.c_str(), reading.length()));

When I simply wait out the sleep time of the RN2483 I get the same internal error.
loraSerial.write(“sys sleep 1000”);
delay(1500);

How can I make this work?

This works for me …

void wakeUP_RN2483() {
    Serial1.end();
    pinMode(PIN_SERIAL1_TX, OUTPUT);
    digitalWrite(PIN_SERIAL1_TX, LOW);
    delay(5);
    digitalWrite(PIN_SERIAL1_TX, HIGH);
    Serial1.begin(57600);
    Serial1.write(0x55);
}

Works for me too. Thanks!