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"
}

Overview of commands for NAD C328

Übersicht von RS232 Befehlen für den NAD C328Permalink

• Ein- und Ausschalten: Main.Power=ON|OFF
• Quelle eines vor/zurück schalten: Main.Source+|-
• Direkte Quelle anwählen: Main.Source=STREAM|OPT1|OPT2|BT|TV
• Lautstärke um im ein Inkrement erhöhen/verringern: Main.Volume+|-
• Direkte Lautstärke einstellen: Main.Volume=-20