Running AttNode v1/v2 on TTN v3

As you will probably know, the legacy TTN v2 Stack will be shut down in December of this year, which means nodes on TTN v2 should be migrated to The Things Stack Community Edition (formerly known as TTN v3 Stack). Unfortunately, the TTS stack made it a little harder to run “incomplete” nodes like the AttNode v1 and v2, which in the default firmware don’t support downlink packets, and are therefore not exactly LoRaWAN Spec compatible.