Hi i use a arduino with dragino Shield. This Code works fine: http://fff-gw-cd1.fff.community/zerobin/?779b5c3d725b208e#dCJtU1i/uJ0JwzEC6DMlCaVmE6BYHUM6EKDw0NVmLkA= I get the Payload 48656C6C6F2C20776F726C6421 in the TTN Console. If i send Payload to the Arduino in the console i get the Message …

[image] ChristianD: 33303433 It seems like you sent the number 3043 in ascii, you can use a hex to ascii converter to “decode” the payload Hex to ASCII Text String Converter Hexadecimal code to ASCII/Unicode text string translator. (or do that decodin…

no i think this is only the ostime (or anything): void onEvent (ev_t ev) { Serial.print(os_getTime()); # the Number u see "33303433" Serial.print(": "); Serial.print(ev); switch(ev) { .... case EV_TXCOMPLETE: Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)")); …

i have send the message over https://console.thethingsnetwork.org/applications/XXX/devices/YYY in the Downlink Input field. I see only the dataLen but not what payload i send. If i not send any payload i only see this in de Arduino Seriel Monitor: … Packet queued 437839436: 10EV_TXCOMPLETE (i…

Received message should be in LMIC.frame with offset LMIC.dataBeg if I recall correctly.

Hi many thx that was it :slight_smile: Nice thx :slight_smile:

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.dat…

Does anyone of you know how the cpp code has to be written to print out the LMIC.dataLen ? We have a RPi as MCU instead of an Arduino - so no ino file. Here is the cpp example file provided with the Dragino shield that I actually use but not sure if there is any downlink payload sent up to my node.…

if fprintf is available at your platform, then try fprintf(stdout, "dataLen=%d\n", LMIC.dataLen); is that what you’ve been looking for?

Something like untested: if(LMIC.dataLen) { // data received in rx slot after tx fprintf(stdout, "Received %d bytes of payload: 0x", LMIC.dataLen); for (int i = 0; i < LMIC.dataLen; i++) { fprintf(stdout, "%02X", LMIC.frame[LMIC.dataBeg + i]); } fprintf(stdout, "\n"); }

Downlink to Node with LMIC

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arjanvanb (Arjan) February 2, 2017, 3:27pm 14

Just to be sure, not too suppress your enthusiasm, but beware of downlink limitations.