serial-proxy

need latest node if possible; use nvm and get v9.2.0

npm instal
node index.js

node index.js test

node index.js test without

see top of file for details

https://docs.google.com/document/d/1JItQcpwWejTq6WnsReT8WptiZ3xlhwmICKHFtv9wsWk/edit#