Get an outline for hub to IoT devices network protocol

[conorpp]

Draft out a simple and reliable network protocol for the IoT hub and IoT devices to connect and communicate.

Ideas:

• Using default UDP ports and broadcasting for LAN IP Address discovery
• Look at simple discovery LAN protocols online. Don't over-engineer.

E.g. a sensor node has 2 states:

1. Not connected. Broadcasts until a IoT "claims" it.
2. Connected. Sends stream of sensor data to IoT hub.

[conorpp]

Collin et. al are figuring out how to do UDP on ESP for low level stuff.

[clcain]

I'll work on making a contract for client to server (ESP to Python) JSON schema.