Multi-Speaker Wireless Audio Streaming

Requirements

• NodeMCU ESP8266
• Speakers
• PIR sensors
• Python 2.7 installed

Node firmware

Make sure your NodeMCU firmware has the PCM and MQTT modules. Otherwise, download a new build on https://nodemcu-build.com/ and flash it following this tutorial.

Install

• On MacOSX:

$ brew install mosquitto

$ pip install -r requirements.txt

Running

• Call the following on your shell to start the Mosquitto broker on localhost:1883:

$ mosquitto

• Run server.py to start the application

$ python server.py

Example

• With both the mosquitto broker and the server.py running, access the web interface at http://localhost:8000 and on a new terminal window, call the following commands to connect 3 nodes:

$ mosquitto_pub -d -t node/connect -m '{ "number": 1, "name": "Room A" }'

$ mosquitto_pub -d -t node/connect -m '{ "number": 2, "name": "Room B" }'

$ mosquitto_pub -d -t node/connect -m '{ "number": 3, "name": "Room C" }'

Refresh the page and you should see the nodes there. Now, start these two subscribers on new terminal windows:

$ mosquitto_sub -d -t song/info

$ mosquitto_sub -d -t song/stream

and click on "Start stream". You should see the results being printed on the subscribers window.

Topics

• song/info:

Returns information about the song that is playing.

• song/stream

Returns chunks of data of the song that is being streamed.

• node/connect

Adds a node to the node network

• node/sensor

Nodes publish their sensor data to this topic.

• node/neighbours

The server returns each node's neighbours.