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main module
===========
Calls each module's init routines then loops through each module's main routines.

uart module
===========
Queues characters received through an interrupt for retrieval at leisure.
Sends characters queued for transmission every scan

esp module
==========
Raw character talking to the ESP 8266.
Sends strings and data to the ESP.
Receives characters from the ESP and treats the following cases:
'\n'            -> sends a completed line
'+IPD,id,len:'  -> reads in length bytes to the relevant id's input buffer
'>'             -> sends the data to the id specified
otherwise       -> adds to the current line

at module
=========
Sends commands
Depends on the esp module.

wifi module
===========
Starts the esp module; doing the auto baud rate detection and logging in if needed.
Depends on the at module.

ntp module
==========
Sends periodic time requests.
Handles received time responses and sets the system time.
Depends on the at module.

1-wire
======
Measured:

480uS reset
 30uS presence pulse starts
120uS presence pulse length

 10uS write 1
 70uS write 0
240uS between writes

 10uS read high
 30uS read low

server module
=============
Responds to http requests
Depends on the at module.

support modules
===============
io   - inputs and outputs
log  - provides logging
time - maintains the system time