Help reinventing the wheel - LoRaWAN with this library

[caiotbc]

Hi everyone,

I'm an undergraduate student diving into the LoRaWAN protocol, and as part of my research, I'm essentially reinventing the wheel by trying to implement LoRaWAN "by hand" using this library. My setup involves devices running the Arduino LMIC library alongside devices using this LoRa library.

Here's what I've been working on:

Scenario 1:
Device (running LMIC) → LoRaWAN gateway → ChirpStack server

Scenario 2:
Device (running LMIC) → Device (using this LoRa library in receive mode) → Serial print + Manual decoding of LoRaWAN packet

Scenario 3:
Device (using this LoRa library and manually built LoRaWAN packets) → Device (using this LoRa library in receive mode) → Serial print + Manual decoding of LoRaWAN packet

Scenario 4:
Device (using this LoRa library and manually built LoRaWAN packets) → Device (using this LoRa library in receive mode) → MQTT → Convert packet to semtech gwmp udp → ChirpStack decoding of packet

Scenario 5:
Device (using this LoRa library and manually built LoRaWAN packets) → LoRaWAN gateway → ChirpStack server

The first four scenarios work perfectly, but in Scenario 5, while a device acting as a "gateway" registers the packets correctly on Scenario 3 and 4, a real Mikrotik LR9 LoRaWAN gateway doesn't accept these hand-built packets.

So far, I've configured:

LoRa.begin(916000000);
LoRa.setTxPower(20);
LoRa.setSpreadingFactor(12);
LoRa.setSignalBandwidth(125E3);
LoRa.setCodingRate4(5);
LoRa.setPreambleLength(8);
LoRa.setSyncWord(0x34);
LoRa.setLdoFlagForced(1);

Is there any additional configuration or parameter needed to get a real LoRaWAN gateway to accept these packets? Any guidance would be greatly appreciated!

Thanks for your time and help!