Event: Uplink not scheduled because TxRx pending issue

[sw-dev-code]

I'm using the LMIC-node library on the Heltec LoRa WIFI V2 board and there is the following problem that appears randomly in time:

Event: Uplink not scheduled because TxRx pending

After this even if I do rejoin device is unable to send data, only the device reboot helps.

[terrillmoore]

I think the LMIC-node library is something else. It might use this library, but I think you should ask for support there.

Technically, this means that the LMIC was busy processing network operations and was not able to accept a transmit at that time. This can really happen on any transmit after the first one; the network can repeatedly send downlinks, and keep the class-A loop busy for an arbitrary period of time. One suspect that path in the LMIC-node library is missing the error that is returned when this happens, and not retrying.