Create a Serial Stream Adapter

At ISIS we have legacy drivers that talk to devices that are connected via a serial port. For testing purposes it would be useful to write an emulator that these drivers can communicate with. We are currently doing this by running another script to convert Serial <-> TCP, see diagram below


Note that the physical loopback is unfortunately required for the OS to properly recognise the port.

It would be useful if Lewis could communicate using serial, therefore removing the need for the script. I am happy to do the work for this, if you think it's something that would benefit Lewis.