Overview

We will detail the steps required to flash the open source Tasmota firmware on a Treatlife 3 way switch and configure it to work with Homebridge.

Hardware

Install Tuya Convert on a Raspberry Pi

See https://github.com/ct-Open-Source/tuya-convert

Flash Device

Detailed instructions can be found:  https://github.com/ct-Open-Source/tuya-convert

...

You will need to hold down the button to get this switch to flash.

> ./start_flash.sh 

Configuring Switch

Configuring WIFI

Connect to the flashed device by looking for it's SSID - tasmota-####

...

The dimmer will reboot and connect to your wifi network. Check your router to find out it's IP address and connect to it via your browser.

Set the GPIOs

3 Way Setup

Issue the following from the console:

> backlog module 18;gpio4 21;gpio5 57;gpio12 30;gpio13 18;gpio14 9;switchtopic 0;switchmode1 0;buttontopic 0;rule1 on event#ON do power2 TOGGLE endon;rule1 1;rule2 on event#OFF do power2 TOGGLE endon;rule2 1

Should result in the following:

From the Configuration → Configure Other screen, input the template and friendly name:

Template: 

{"NAME":"Treatlife 3-Way","GPIO":[0,0,0,0,21,158,0,0,22,18,9,0,0],"FLAG":0,"BASE":18}

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You should end up with a configuration that looks like:

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2 Way Setup

> backlog module 18;gpio4 5652;gpio5 0;gpio12 2129;gpio13 17;gpio14 0;switchtopic 0;switchmode1 0;buttontopic 0;rule1 0;rule2 0switchmode 1

Homebridge Config

For integration with Homebridge, we are going to use the mqttthing plugin and run all of the commands through an mqtt server.

Tasmota Setup:

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Homebridge Config File

3-Way Setup: 

		        {
            "accessory": "mqttthing",
            "type": "lightbulb",
            "name": "dimmer2garage-light",
            "url": "http://192.168.X1.X50:1883",
            "username": "homebridge",
            "password": "pass",
            "topics":
            {
                "getOn":                "stat/dimmer2garage-light/POWERPOWER1",
                "setOn":                "cmnd/dimmer2/POWER",
                "getBrightness":        {
                                          "topic": "statcmnd/dimmer2garage-light/RESULTPOWER2",
                                          "apply": "return JSON.parse(message).Dimmer'toggle';"
                                        },
                "setBrightness":        "cmnd/dimmer2/Dimmer"
            },
            "onValue": "ON",
            "offValue": "OFF",
            "startPub":
            {
                "cmnd/dimmer2garage-light/POWERPOWER1": "",
                "cmnd/dimmer2/Dimmer": ""},
            },
		    "confirmationPeriodms": 1000
        },

Out of Sync

Sometimes the switch may be out of sync with what it reports to homebridge. When you click Toggle 2, the Toggle1 should reflect the current state of the light. If this is not the case, click the Toggle 1 button.

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Reference