Api.lorawan.send() always returning zero

[wardzx (ward)]

Hi,
I am using RAK4631 RUI version. The modules manages to join the LoRaWAN network successfully without any problem but when executing api.lorawan.send() it returns zero al the time. Why would this happen?

[beegee (Bernd Giesecke)]

There can be many reasons.
Can you show your code, what is your payload size, what is the datarate you use, what LoRaWAN region do you use.

[wardzx (ward)]

Thank you for the fast reply.

Here is the function I am using for data uplink. It has been working without a problem before.

The region is EU868MHz. The data size is around 10 Bytes being sent once every 5 minutes.

bool lorawan_uplink(uint8_t* loraPacket, uint8_t packetSize)
{
    /** Payload of Uplink */
    static uint8_t data_len = 0;
    //stay awake for amount of time to get downlink packet
    scheduler.sleepTimer = systemTick;

    memcpy(collected_data, loraPacket, packetSize);
    data_len = packetSize;

    if(false == api.lorawan.send(data_len, (uint8_t *) collected_data, 2, true, 1))
    {
      NVIC_SystemReset();

      
    }

    return true;
}

[beegee (Bernd Giesecke)]

What RUI3 version are you using?

How is collected_data declared?
How is scheduler declared and what is the value of systemTick?
What library do you use for scheduler? That is not an RUI3 function.

[wardzx (ward)]

Hi,

Sorry for the late replay

The problem was due to using very large payload data to send over LoRaWAN.