Fixed DR in OTAA based example

Hello.

I started my node from your OTAA example. Since the node is a mobile GPS tracker, I switched off ADR and decided to use a lower data rate.

Checking operation, I can see he device uses other DR than configured. Why is that?

Here is the code used to configure device:

//moving node should not use LoRaWAN ADR feature (ADR = adaptive data rate)
    LMIC_setAdrMode(false);
    
    LMIC_setDrTxpow(DR_SF10,14);

Please help.