AppEUI == 0 definitely doesn't work (resolved: gateway bug)

[terrillmoore]

I'm embarrassed to say that AppEUI == 0 causes Join requests to be silently skipped. The LMIC goes through all the motions (including EV_TXSTART) but the gateways don't see the uplinks. Using AppEUI == 1 (for example) works fine, all other things being equal. EV_TXSTART is particularly odd, because that means it should have called the radio driver, and indeed we received a complete answer. It seems likely that the message is corrupted in some way.

This is high prio to fix. For now, please use AppEUI == 1 with TTN V3.

Repro case was using Arduino LoRaWAN library but I think this is an LMIC problem.

[terrillmoore]

This is very curious. I connected a device to a RWC 5020B and confirmed that the compliance sketch with AppEUI == 0 works fine. (Also checked the uplink messages captured by the 5020B using @tanupoo's lorawan-parser, and everything was fine.

So this is not an LMIC problem per se. Discussion continues at forum.mcci.io.

[chansheunglong]

I have been using APPEUI = 0 for TTNv3 and is working for me
I am using the latest version of LMIC on AS923

Most of my end device use APPEUI = 0

[terrillmoore]

I tracked this down to a fault in the packet forwarder used on many of our MultiTech gateways. So it really didn't work, but it had nothing to do with the LMIC. Using MultiTech + basic station works; or using other gateways works.