Is starting OTAA join on SF12BW125 (EU868) LoRaWAN compliant?

[tlu]

I remember that discussion. It’s probably this (assuming you’ve not already found it).

Start OTAA join on SF7BW125 or SF12BW125? (EU 868MHz)

When doing OTAA join (ADR either enabled or disabled): LMIC-Arduino tries to OTAA join at SB7BW125 first. If after some attempts the JOIN does not succeed it then tries at SF8BW125, if after some attempts the join does not succeed it then tries at SF9BW125. Up till SF12BW125. Then some later ADR should kick in (if ADR based changes are required). The (LoRaMAC-node based) LoRaWAN library included with the STM32L0 Arduino core starts OTAA join at SF12BW125. Then after some time ADR kicks in…

I can see benefits/problems in both approaches. Perhaps it should start in the middle