Server should not close clients when client only listens #13578
Merged
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Client was not sending Ping to server when last read time is
up-to-date. When server constantly pushes events to client,
client does not send any ping to server. And consequently,
server closes client because it does not send any ping.
Client logic has changed so that it send pings if there is no
outgoing packages recently, rarther than looking at incoming
packages.
fixes #13576
(cherry picked from commit 9bb70fa)