Edge Driver: Two-way communication

[weimeng]

Two-way communication for Edge driver is currently blocked because there's no way to listen for UDP broadcasts on port 31415:

Calls to tcp.bind or udp.setsockname may only specify port 0 to be assigned a port randomly, unless you are binding to a multicast IP address and have already set the reuseaddr socket option to true. This is to prevent unexpected collisions between drivers trying to bind to the same port. We’re looking into ways to allow binding to stable port numbers in a way that prevents conflicts, but don’t have solid plans yet.

https://community.smartthings.com/t/smartthings-edge-developer-beta-known-issues-and-bug-tracking/230389

This might be a good reference for the future: https://community.smartthings.com/t/solved-edge-need-help-to-implement-udp-server-with-cosock/240726/2