433 MHz Outlet (Etekcity) MQTT (Homebridge) Controller

This is to control Etekcity 433MHz outlets.

Requirements

• 433utils
• wiringPi
• 433Mhz receiver and transmitter
• nodejs
• MQTT broker

Setting up 433MHz sniffer

1. Follow the instructions for setting up the 433Mhz modules. Receiver goes to WiringPi's 2 and sender goes to wiringPis 0. Use 5V & GND from RPi. For the receiver, use the pin closest to ground.
2. Clone and build 433utils
3. Optionally via docker: docker-compose up sniffer

etekcityZapTx.c

etekcityZapTx.c was pulled from http://shaunsbennett.com/piblog/?p=142

He just has it listed as copyright, nothing open source, so I'm not going to list it as that, but I did have to modify it to get it to work

In it, he uses the sizes at 8bit x 12 bit x 4 bit. It actually is 10bit x 10 bit x 4 bit.

The first 10 bits are your specific code.

The next 10 are for the number of switch (this is consistent)

The 4 are for on/off. Also consistent

You can figure your first 10 bit code with 433Utils and RFSniffer

1. Take the decimal number they give you
2. Convert it to binary
3. Pull off the last 14 bits
4. Convert the remaining back to decimal
5. This is your ADDR_PREAMBLE and first parameter to the etekcityZapTx

Defining the codes array

1. Determine the ADDR_PREAMBLE from above
2. Edit codes object in config.js with this and labeling the switches

const codes = {
	'SWITCH_LABEL' : {
		'off': 'ADDR_PREAMBLE SWITCH_NUMBER off',
		'on': 'ADDR_PREAMBLE SWITCH_NUMBER on'
	}
}

Docker

1. Save config/config.js with these values
2. Copy .env-sample to .env and edit MQTTHOST value
3. docker-compose up -d server

Homebridge Setup

Install homebridge-mqttthing

Add these accessories in config.json, editing url to point to your MQTT broker. Change the names of the outlet as desired.

{
	"accessory": "mqttthing",
	"type": "outlet",
	"name": "Outlet 1",
	"url": "mqtt://o.xrho.com",
	"topics": {
		"getOn": "switch1/getOn",
		"setOn": "switch1/setOn"
	}
}