That's exactly what I've done :) The checksum algorithm that suffixes each msg with a 2 byte check took a little bit of figuring out. I'm using tornado.tcpserve

That's exactly what I've done :) The checksum algorithm that suffixes each msg with a 2 byte check took a little bit of figuring out. I'm using tornado.tcpserver.TCPServer and tornado.iostream. Another plus is generating logs of the msg flow; useful for diagnostics, and the after the fact specs you often need with crufty old systems.