Generate packets for a window.
Set max timeout.
Sender: waits for ack's..sends windows etc.
Main sender loop done.
Sender: EOT packet crafting done.
Stupid typo.
Send the EOT packet - SENDER done.
MakePacket is now abstract.
Receiver: current sequence number.
Format.
Receiver: Wait for SOT packet.
Receiver:crash-no SOT;Client:wait 5s before data