Connect Sonoff running Tasmota

[ragflyer]

Tasmota is a popular open firmware for the Sonoff switches. It features a MQTT interface and I thought it would be good to connect it to Mycontroller.
I couldn't configure Tasmota to publish in a Mysensors compatible format.
Topic is configurable, but the last part and paypload are fixed and would have to be changed in the sourcecode.

Messages of Tasmota look like this:

00:00:08 MQT: mygateway-in/25/1/1/0/2/RESULT = {"POWER2":"OFF"}
00:00:08 MQT: mygateway-in/25/1/1/0/2/POWER2 = OFF
00:00:09 MQT: mygateway-in/25/1/1/0/2/RESULT = {"POWER1":"OFF"}
00:00:09 MQT: mygateway-in/25/1/1/0/2/POWER1 = OFF
12:00:22 MQT: mygateway-in/25/1/1/0/2/STATE = {"Time":"2018.05.09 12:00:22","Uptime":"0 00:00:15","Vcc":3.499,"POWER1":"OFF","POWER2":"OFF","Wifi":{"AP":1,"SSId":"2.4GHz","RSSI":78,"APMac":"46:..."}}
12:02:00 MQT: mygateway-in/25/1/1/0/2/UPTIME = {"Time":"2018.05.09 12:02:00","Uptime":"0 00:01:53"}
12:05:22 MQT: mygateway-in/25/1/1/0/2/STATE = {"Time":"2018.05.09 12:05:22","Uptime":"0 00:05:15","Vcc":3.499,"POWER1":"OFF","POWER2":"OFF","Wifi":{"AP":1,"SSId":"2.4GHz","RSSI":82,"APMac":"46:..."}}

Any idea what would be the quickest way to make these devices compatible?

Communication of Tasmota: https://github.com/arendst/Sonoff-MQTT-OTA-Arduino/wiki/MQTT-for-Newbies

[jkandasa]

@ragflyer topic last character and payload should be parsed with a custom provider. Kindly create a feature request on GitHub Page.

On the ticket add supporting documents for this ticket. I will work on this when I have time.

Thank you!

[ragflyer]

Found a workaround using Node-Red, for newbies like me this might be helpful:

Flash Tasmota to your Sonoff,
set MQTT topic to e.g. sonoff-1234,
full topic to e.g. /smarthome/%prefix%/%topic%/

Install Node-Red, add node-red-dashboard.
Drag a MQTT input, set topic to /smarthome/stat/sonoff-1234/POWER
Add a switch, uncheck "If msg arrives on input, pass through to output:", let it show state of the input, set on payload to String "ON", off payload to "OFF"
Add a MQTT output, set topic to /smarthome/cmnd/sonoff-1234/power

Now you should have a working switch on the Node-Red dashboard, it should always show the state of the sonoff.

To show the state of the switch in Mycontroller, add a Function and connect it to MQTT input:
if (msg.payload == "ON") {
msg.payload = 1;
} else if(msg.payload == "OFF") {
msg.payload = 0;
}
return msg;

There is a replace function for message payloads, you could use that instead.
Connect a MQTT output to the function, set topic to
mygateway-out/<id>/<child-id>/1/0/2

This will post the converted on/off message to mysensors format to be read by the mycontroller mqtt gateway.