Code 6, send failed

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    Geoffrey Rutter
    Participant

    I am using the Xdot with LibXdot3.2.1, mbed51101, EU868 class A. I am occasionally getting a “Send failed – code 6” message, which I had assumed to be due to no airtime on any channel, with the implication that nothing was transmitted. However, today I have recorded an instance where available channels =0, Send failed code 6, No Ack received, yet a downlink was received. What puzzles me is how it could receive a downlink if it was incapable of sending an uplink. I’m also not sure if it did actually send the data – I normally accept either an Ack or a downlink as confirmation.
    Any enlightenment would be appreciated.

    [INFO] Send
    [DEBUG] Send with tx timeout 40000
    [INFO] Preparing frame
    [TRACE] Adding mac commands to frame 2 bytes
    [TRACE] NA: ed772b18
    [TRACE] NSK: fd8fc6a95a2f2eed96effd36e4fa73d6
    [TRACE] DSK: c3fbaaba75e34b41a743f813ee41f295
    [TRACE] Adding MIC to frame
    [TRACE] Sending 55 bytes
    [TRACE] Number of available channels: 0
    [ERROR] Send failed : code 6
    [DEBUG] No Ack received or Tx failure
    [DEBUG] Receive 2C
    [DEBUG] Receive 04
    [DEBUG] Receive 29
    [DEBUG] Receive FE
    [DEBUG] Receive E8
    [INFO] Sent 40
    [INFO] Data received

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