NAD-RS232-REST

This is a small python script which does the following:

connect via RS232 to a NAD Electronics Amplifier (tested with a C-368 model)
connect to a MQTT broker and publish all messages from the device
subscribe to a given topic and forward all messages as commands to the device
implement a simple REST-API to query/configure the C-368 device

Dependencies

This has been tested on the following setup:

Raspberry Pi 3, running Debian Jessie
Python 2.7 and python-pip from official packages
the following installed via pip: paho-mqtt, pyserial, flask
a PL2303-type USB2Serial Adapter

Known Limitations

The current state of this program is 'proof-of-concept', therefore it lacks many import aspects:

proper error handling
configuration via arguments/config file
clean code :-)
you can not disable mqtt
no virtualenv

REST API Examples

Query the current power state:

curl http://example.host:3333/nad/c368/v1.0/Main/Power
{
  "command": "main.power", 
  "error": 0, 
  "value": "on"
}

Set the current power:

curl -X PUT http://example.host:3333/nad/c368/v1.0/Main/Power/on
{
  "command": "main.power", 
  "error": 0, 
  "value": "on"
}