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TCP Server mode worked exactly as expected. I am able to send raw data via tcp sockets to the device, and it simply forwards it along out the serial port. A response/acknowledgement is forwarded right back through the opposite direction. Setup was quick and easy. The missing star is for latency. I am seeing up to a few whole seconds before my data is passed through to the serial endpoint. The response is sent back almost instantly, so I’m not entirely sure wherein lies the bottleneck. Not disappointed given the price of the unit.
Update: After some more experimenting, I found that the latency I was experiencing was the unit trying to accept NEW connections from remote clients (I was creating a new socket connection for every request). If you allow your connections to persist, the response is appropriately speedy.