QueueRejected
The device rejected the packet at its transmit queue (QueueStatus.res != 0), most commonly because the firmware's bounded in-flight queue (~16 packets) is full.
Surfaced immediately instead of waiting out the ACK timer. Callers should back off and retry; bulk senders should pace submissions against this signal.
Since
0.2.0
Parameters
res
the raw QueueStatus.res error code reported by the firmware
Functions
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Plain-language message for any SendFailure. Never empty.