TTN Mapper with T-Beam V1.2

It has just dawned on me that both of your EUI’s are invalid - they should have bit 0 set to 0 and for local addresses, bit 1 set to 1. So as MSB, the second ‘digit’ can only ever be an even number.

See: DevEUI for non-hardware assigned values - #23 by terrillmoore which is why Random EUI or Key generator | descartes exists.

Also, LMIC has been shown to NOT cope at all with an all zero JoinEUI.