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Unable to join ttn network ttn-otaa.ino

10

I am using a Arduino Pro mini 3.3V with a modtronix inAir9b device. Pin mapping is as follows .nss = 10, .rxtx = 6, .rst = 5, .dio = {2,3,4}...

I need to change the preamble length, but I can't figure out where it is set for TX. Also, is it set to the same for TX and RX? How...