Send ping if no message received from peer for 30s #1340
Merged
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As long as we receive messages from our peer, we consider it is
online and don't send ping requests. If we don't hear from the
peer, we send pings and expect timely answers, otherwise we'll
close the connection.
This is implemented by scheduling a ping request every 30 seconds,
and pushing it back every time we receive a message from the peer.