ERROR : Up retransmission

Hello everybody ,

After letting my end_device transmit for a few days . I found this in the errors log

Can anybody tell me what may be the cause of these errors and why there is a different value on each day and what does it mean ?

Thank you .

This error is reported when the device sends the same uplink more than once OR when somebody is replaying uplink frames (there is no way to detect the difference in LoRaWAN 1.0.x).

Note that the NbTrans (number of times an uplink must be repeated by the device) is also driven by the ADR algorithm. In case of packet-loss, it will increase this value up to 3, when the packet-loss drops, it lower this again.