LMIC_ERROR_TX_NOT_FEASI...

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yaleman.org

If you get the LMIC_ERROR_TX_NOT_FEASIBLE error when doing TTNMapper or generally using the arduino-lmic library (my version is 3.3.0) then do this patch in src/lmic/lmic.c. This patch was shown to me by Chris from Accelerando Consulting.

Original code:

u1_t maxFlen = LMICbandplan_maxFrameLen(LMIC.datarate); if (flen > maxFlen) { LMICOS_logEventUint32("frame too long for this bandplan", ((u4_t)dlen << 16) | (flen << 8) | maxFlen); return 0; }

New code adds a check for maxFlen:

u1_t maxFlen = LMICbandplan_maxFrameLen(LMIC.datarate); if (maxFlen > 0) { if (flen > maxFlen) { LMICOS_logEventUint32("frame too long for this bandplan", ((u4_t)dlen << 16) | (flen << 8) | maxFlen); return 0; } }

There’s something about checking for max frame length that only gets triggered when you’re using the 923Mhz bandplan, and this fixes it. I’m guessing it’s part of the lookup in LMICas923_maxFrameLen in lmic_as923.c which return 0 but I haven’t had time to figure out what’s triggering it.

February 15, 2021 · 1 min reading time#arduino #esp32 #patches #lorawan

Tag » Arduino U4_t