Downlink to Node with LMIC

For future reference, a quick way to print binary content as hexadecimal bytes for debugging:

if (LMIC.dataLen) {
    // data received in rx slot after tx
    Serial.print(F("Received "));
    Serial.print(LMIC.dataLen);
    Serial.print(F(" bytes of payload: 0x"));
    for (int i = 0; i < LMIC.dataLen; i++) {
        if (LMIC.frame[LMIC.dataBeg + i] < 0x10) {
            Serial.print(F("0"));
        }
        Serial.print(LMIC.frame[LMIC.dataBeg + i], HEX);
    }
    Serial.println();
}

(Maybe Arduino’s offer an easier way.)