Keeping sent a package during the stream for firewall hole punching #117
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I added the keep alive hole punching (default 30 seconds). It is not possible to create a dedicated thread for this operation because the socket is bound in Receiver() method and it might collide with the blocking Receive operation. I added a check in the receiver loop. If the time between the last keep alive and the current time is >= with the defined timeout (30 seconds as default) a package is sent.