Dragino with ultrasonic sensor and TTN

[arjanvanb (Arjan)]

@zielpuls

and send test text messages to the network

Good to see you changed that text into a 2 bytes binary encoded payload. But there’s still something left in your code:

@zielpuls

byte payload[2];
payload[0] = highByte(belegt);
payload[1] = lowByte(belegt);

// Prepare upstream data transmission at the next possible time.
LMIC_setTxData2(1, payload, sizeof(payload)-1, 0);

Above, sizeof(payload)-1 will make LMIC send 1 byte, not 2. Simply remove that -1.

The -1 part is probably a leftover of the test that used text? Even a fixed-length char array has a terminating null-character. That does not need to be included in the LoRaWAN packet, as the receiver already knows how long a LoRaWAN packet it. So, for text you’ll often see sizeof(...) - 1.

LoRaWAN examples using text are just evil.