Not recieving Downlink messages from gateway

[arihantdaga]

I am using Dorji DRF1276G Module Coupled with Atmega 328. And I am using loraserver.io on my server. So far, sending data from the node is working great. I am able to send the data from the node to the gateway which is sending to my server as well. But none of the messages i send from gateway to the device are recieved here - in short these lines are never executed -

Serial.println(F("Received "));
Serial.println(LMIC.dataLen);
Serial.println(F(" bytes of payload"));

Does This library support downlink ? Or am i doing something wrong, can anybody help me out here..

[cyberman54]

yes, it supports downlinks and it works. Check your setup, i.e. cabling of DIO lines of SX127x chip. DIO0 and DIO1 must be wired to GPIO ports of the CPU where lmic is running. Pin mappings in configfile must be set accordingly to wiring.

[arihantdaga]

@cyberman54 Thank you very much. Its working now. In my case i had to set this in code

LMIC.dn2Dr = DR_SF9;

as mentioned in the readme. Although i am missing it sometimes.. infact it worked fine initially and now its not working again.. I enabled debug and set LMIC_DEBUG_LEVEL to 1 After that this is what i am getting on serial window.

Packet queued
9559710: RXMODE_SINGLE, freq=867500000, SF=7, BW=125, CR=4/5, IH=0
9563060: Received downlink, window=RX1, port=-1, ack=0
9563110: EV_TXCOMPLETE (includes waiting for RX windows)
9563325: engineUpdate, opmode=0x800

While this is what i have in my ttn.ino -

case EV_TXCOMPLETE:
           Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)"));
           if (LMIC.txrxFlags & TXRX_ACK)
             Serial.println(F("Received ack"));
           if (LMIC.dataLen) {
                Serial.println(F("Received "));
                Serial.println(LMIC.dataLen);
                Serial.println(F(" bytes of payload"));
                Serial.print("txCnt :"); Serial.println(LMIC.txCnt);
                Serial.print("txrxFlags :"); Serial.println(LMIC.txrxFlags);
                Serial.print("dataBeg :"); Serial.println(LMIC.dataBeg);
                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);
                }
           }
           // Schedule next transmission
           os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);
           break;

[arihantdaga]

And sometimes i am getting this in serial logs

Packet queued
288414458: RXMODE_SINGLE, freq=868300000, SF=7, BW=125, CR=4/5, IH=0
288477694: RXMODE_SINGLE, freq=866550000, SF=10, BW=125, CR=4/5, IH=0
288480158: EV_TXCOMPLETE (includes waiting for RX windows)
288480212: engineUpdate, opmode=0x900

[iApotoxin]

can i see yours code that working?. i try to solve it but i can't.

thank you.

[Shashank545]

I have implemented the single channel packet forwarder LORA gateway and it is able to send data from node to server through gateway. But I am not able to send data from gateway to device to control led. i a m also able to send downlink data from TTN to gateway and gateway is also able to send it . My led actuation is not happening. Here is what I have used.

Lora Node : Arduino UNO + Dragino LoRa Shield Lora Gateway : Rasperry Pi LoRa HAT + RaspberryPi3B

Any immediate and urgent help would be appreciated.

[sprokkie]

have same problems here, no data recieved bij de heltec 32 module.

in the serial log:

Packet queued 20246753: RXMODE_SINGLE, freq=867700000, SF=7, BW=125, CR=4/5, IH=0 20306501: RXMODE_SINGLE, freq=869525000, SF=9, BW=125, CR=4/5, IH=0 20320093: EV_TXCOMPLETE (includes waiting for RX windows) 20322820: engineUpdate, opmode=0x900 22197820: engineUpdate, opmode=0x908 22197867: TXMODE, freq=867900000, len=26, SF=7, BW=125, CR=4/5, IH=0 Packet queued 22261225: RXMODE_SINGLE, freq=867900000, SF=7, BW=125, CR=4/5, IH=0 22320973: RXMODE_SINGLE, freq=869525000, SF=9, BW=125, CR=4/5, IH=0 22334565: EV_TXCOMPLETE (includes waiting for RX windows) 22337292: engineUpdate, opmode=0x900

the ino file the samen as above

`case EV_TXCOMPLETE:

       Serial.println(F("EV_TXCOMPLETE (includes waiting for RX windows)"));
       if (LMIC.txrxFlags & TXRX_ACK)
         Serial.println(F("Received ack"));
       if (LMIC.dataLen) {
            Serial.println(F("Received "));
            Serial.println(LMIC.dataLen);
            Serial.println(F(" bytes of payload"));
            Serial.print("txCnt :"); Serial.println(LMIC.txCnt);
            Serial.print("txrxFlags :"); Serial.println(LMIC.txrxFlags);
            Serial.print("dataBeg :"); Serial.println(LMIC.dataBeg);
            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);
            }
       }
       // Schedule next transmission
       os_setTimedCallback(&sendjob, os_getTime()+sec2osticks(TX_INTERVAL), do_send);
       break; `

any ideas what goes wrong ?

@arihantdaga What code do you use ?

[arihantdaga]

@sprokkie I am sorry, I was using this earlier, These days i did not try, but i think mostly it was because of improper settings on the loraserver, (I did not set proper working class of the lora node. I was setting it to class C in device profile, which was wrong). I am not sure exactly what could work in your case, But mostly just set your pins properly, initialize the module properly. And set the configuration in the loraserver or things network whatever you are using properly.

[sprokkie]

i use the heltec esp32 lora module, it works well only no message from the thingsnetwork to the node. any one else who can help ?