LMIC-node downlink saved to variable [SOLVED]

Projects General Guidance
1

Hello, I am tinkering with a LoRa project with The Things Network. I am currently using the platformio example LMIC-node in conjunction with my Heltec LoRa32 WIF (V2) board. I am trying to save the downlink into an array and then convert that downlink value into an integer. I am attempting this in the "processDownlink" function of the LMIC-node.cpp file. I need some assistance on how to do this as I am an eternal newbie.

void processDownlink(ostime_t txCompleteTimestamp, uint8_t fPort, uint8_t* data, uint8_t dataLength)
{
    // This function is called from the onEvent() event handler
    // on EV_TXCOMPLETE when a downlink message was received.

    // Implements a 'reset counter' command that can be sent via a downlink message.
    // To send the reset counter command to the node, send a downlink message
    // (e.g. from the TTN Console) with single byte value resetCmd on port cmdPort.

    const uint8_t cmdPort = 100;
    const uint8_t resetCmd= 0xC0;
    for (int i = 0; i < dataLength; i++)
    {
        uint8_t rawData = (data[i]);
        char num[5] = {data[0], data[1], data[2], data[3]};
        int val;
        sscanf(num, "%d", &val);
        Serial.println(val);
    }

I am sending the number "1500" down in The Things Network console window. I send it down in Hexadecimal format (31 35 30 30) and am trying to save it to the "int val" variable.

I get this as the output.

000001036488:  Event: EV_TXCOMPLETE
               Up: 2,  Down: 2
               Downlink received
               RSSI: -36 dBm,  SNR: 5.7 dB
               Port: 1
               Length: 4
               Data: 31 35 30 30
1500
1500
1500
1500
2

As far I seen - it converted to variable fine.
What is your problem?

3

not sure why you have the for() loop

 for (int i = 0; i < dataLength; i++)

it evaluates and prints the same result 1500 four times

4

wow, sorry im still very inexperienced. I removed that for loop and it's working just fine now