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This is what I have so far in trying to match with the following frequency plan for TTN:
https://account.thethingsnetwork.org/api/v2/frequency-plans/KR_920_923
Not sure what copyright notices should be applied to the "new" files based on "existing" files.
For many of the "magic numbers", made my best guess.
Looks like KR921 doesn't have FSK, so I took that out.
https://www.thethingsnetwork.org/docs/lorawan/frequency-plans.html#kr920-923
Verified operation of LoRa Node -> LoRa Gateway with Join/Uplink/Downlink operation on TTN with Gateway using KR_920_923 as stated above.