Update client IceProtocolConnection to schedule first heartbeat only … #4115
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…once connected
This is a small fix to the "send heartbeat" logic in IceProtocolConnection.
Prior to this PR, an Ice client connection could send heartbeats before receiving the initial ValidateConnection frame from the server. That's a minor violation of the
ice
protocol that neither Ice nor IceRPC would detect. It's also very unlikely. Nevertheless, a small bug.I also added a test to verify that an
ice
client connection that doesn't write anything is not aborted by the server connection idle monitor.