Remote Control Server

Using `websocketd`

This is BY FAR the easiest way to start playing with websockets TODAY.

websocketd is created by Joe Walnes: https://github.com/joewalnes/websocketd/

For example, you can pipe the incoming Arduino serial data into a logfile:

nice -20 cat /dev/ttyACM0 > current.csv &

then use websocketd to serve the data that comes from tailing this logfile:

websocketd --port=8080 tail -f -n 1000 current.csv

The serving script can be pretty much anything that writes to STDOUT and reads from STDIN, in any language of your choice. With a little Python non-blocking reading, I bet you could even implement a simple chat server!

Using Python `websocket` and `serial-aio`

You'll need to learn some asynchronous programming in Python, but this is a good starting point for more complex servers. The Python websocket module with async support: https://github.com/aaugustin/websockets

Software Versions

V1,2

Only perform a subset of the desired message-passing operations (serial-to-websocket, websocket-to-serial).

V3

WORKS - v3.py reads incoming data over the serial port and appends it to a list. Once per second, the most recent value in the list is written to the websocket.

V4

WORKS - v4.py also has data lookback when the websocket is created.

V5

WORKS - v5.py adds additional input checking and has support for multiple data inputs.

V4a

WORKS - v4a.py has some minor refactoring and tweaks for working with 555.html

THIS was the point where everything was version controlled in its own repository!

To Do

implement security on write operations
write incoming data to logfile
handle incoming data in a separate thread/process

brandoncurtis/websocket-arduino

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