Over-the-air-activation OTAA with LMIC

End Devices (Nodes)
36

@Kibet, I just pushed quite some fixes to the lmic master branch, could you see if your join at SF7/SF8 persists? I’ve just tested this here, SF7 joins work for me. Two related remarks:

  • Perhaps your clock is inaccurate, but the error is negligable at the slower SF ratings? To check, add this to your sketch (somewhere during setup):

    LMIC_setClockError(MAX_CLOCK_ERROR * 1 / 100);

This tells LMIC to make the receive windows bigger, in case your clock is 1% faster or slower.

  • If you set LMIC.dn2Dr before starting a join, I believe the RX2 window during the join will use that datarate. I do not think that TTN will use RX2 for join accepts (since the RX1 should always have equal or lower SF, so less airtime), but perhaps I’m mistaken and it does matter somehow.
2 Likes