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The envisalink will only accept one client connection on port 4025. When a connection is established an attempt at a second connection has the following behavior. client sends SYN envisalink sends SYN-ACK client sends ACK (this is the normal 3-way TCP handshake for connections establishment) then ...

The envisalink will only accept one client connection on port 4025. When a connection is established an attempt at a second connection has the following behavior. client sends SYN envisalink sends SYN-ACK client sends ACK (this is the normal 3-way TCP handshake for connections establishment) then ...

I have written (in TCL) a simple TPI client which decodes, timestamps and logs all TPI commands from the envisalink 3. The client can detect socket errors, like the connection closed or reset by the server. In order to make this more reliable, the client sends a poll application command every 2.5 ...