A failure in delivering a message (usually used for routing control messages, but might be provided in addition to ack.fail_id to provide details on the type of failure).
The application layer service on the remote node received your request, but considered your request somehow invalid
We received a nak while trying to forward on your behalf
We reached the max retransmission count (typically for naive flood routing)
This message is not a failure
The application layer service on the remote node received your request, but considered your request not authorized (i.e you did not send the request on the required bound channel)
No suitable channel was found for sending this packet (i.e. was requested channel index disabled?)
No suitable interface could be found for delivering this packet
The request had want_response set, the request reached the destination node, but no service on that node wants to send a response (possibly due to bad channel permissions)
Our node doesn't have a route to the requested destination anymore.
The packet was too big for sending (exceeds interface MTU after encoding)
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