@royzone Your code is a bit incomplete because you did not include the entire line but I think that you are comparing some boolean variable to the value "HIGH" and if it is HIGH then you send the value "1" with ack (acknowledgement).
If an experienced coder see that my asumption is incorrect please correct me 
Just add LUA as a Logic Action triggered by a cyclic condition in PLEG
Using Lua just get the value from the temp sensor variable and set the variable on the thermostat:
local PipeTemp = luup.variable_get("urn:upnp-org:serviceId:TemperatureSensor1","CurrentTemperature", 42)
luup.variable_set("urn:upnp-org:serviceId:TemperatureSensor1","CurrentTemperature",PipeTemp,44)
I have noticed that in the latest Vera firmware if a variable has no value it does not show up in the Advanced -> Variables tab.
Try writing some value manually from Apps -> Develop apps -> test loop code (here is an example):
luup.call_action("urn:upnp-arduino-cc:serviceId:arduino1", "SendCommand", {radioId="11;3", variableId="VAR_4", value=1}, 24)
24 in the example is the Id of the MySensors plugin Main device.
11;3 in the example is altid of the sensor node device.
After writing and refreshing of browser (Ctrl + F5) you should see the variables under Advanced -> Variables tab
The command should also send the value to your child node.
@gohan said in Which dust sensor do you use and why?:
@korttoma if you have a library that can read the values from the sensor, you can easily add the mysensors code
yeah I know, I just thought that if @NeverDie already made a MySensors sketch I would not have to invent the wheel again.
@NeverDie what lib are you using and how? I2C?
Just received an Plantower PMS5003 allso, do you have a "MySensors" sketch that you could share?
@vladimir there is an example for using rotary encoder on this page:
Yeah, my 6075 device is also still working fine on the 2xAA batteries I put in it a year ago.
@madelle-kamois This has been done before. For some inspiration -> https://forum.mysensors.org/topic/157/diy-blind-control-motor
I found an ESP-07 so I uploaded the ESP8266 WiFi Gateway sketch to it an tested inclusion mode in Vera (MySensors plugin version 1.5) and it seems to work just fine for me. I used esp8266 Community version 2.4.1 in Arduino IDE 1.8.5 and MySensors version 2.2.1 -alpha. I'm really out of ideas why this is not working for you.