TTGO Lora32 different versions......I try m V2 with TTN V3(TTS)

 TTGO lora32 is a esp32 with lora chip, with various version...

it was very confusing when they keep on pushing new version but with no clear documentation.

different version may have different connection pin on lora chip, and others. and the version is not marked on PCB. 

same thing on their git pages. upto 2021/11 I found 2:

https://github.com/LilyGO

https://github.com/Xinyuan-LilyGo

the second one seems to be more upto date. For example you can find a version identification on there:

https://github.com/Xinyuan-LilyGO/LilyGo-LoRa-Series

Still very confused, at the end I found that mines are V2


TTgo also make some examples for connecting to TTN, but lack of clear notes, it make me very difficult to read and use.
here seems to be the one with TTN V3
https://github.com/Xinyuan-LilyGO/LilyGo-LoRa-Series/blob/master/docs/en/LilyGo_LoRa_Series_Quick_Start_On_TTN.md

There are listed in git:
https://awesomeopensource.com/projects/lmic/lorawan
https://www.thethingsnetwork.org/forum/t/lmic-node-one-example-to-rule-them-all/46964

I found this:https://github.com/lnlp/LMIC-node with good wiki and tell you what you what are the boards supported and modification needed.

 https://github.com/lnlp/LMIC-node#21-lora-development-boards



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