A side note - Send-Q refers to amount of data queued (bytes), not number of packets.

Regarding your problem. Perhaps you could enable SO_KEEPALIVE on the socket, possibly with tweaked TCP_KEEP* values, so that recovery can happen in a timely manner? See Socket, socket(7), and tcp(7).

In reply to Re: function to count pending packets in TCP socket by Anonymous Monk
in thread function to count pending packets in TCP socket by Anonymous Monk

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