Requesting value from Domoticz

[dbemowsk]

@benya said:

Thanks.
What if need to get value from dummy sensor controlled by Domoticz (not by another MySensors node)?
Where is corresponding childSensorId?
My RPi runs both MySensors gateway and Domoticz.

Are you trying to get the value on, or send the value to one of your MySensors nodes?

[benya]

The goal is to pass value to the sensor that could be sleeping. Domoticz doesn't support MySensors smart sleep mode and polling current value is only option now.

[dbemowsk]

@benya I think I understand what you need. I have not worked with smart sleep, but I have passed dummy sensor information to a MySensors node. The key is to have the dummy sensor, and a corresponding MySensors child for the node. If you look at this post, I hve a response where you will see how I do this with my thermostat node to pass the thermostat mode from a dummy selector to my thermostat bridge node.

[benya]

You are pushing value from controller to the node.
But if node is sleeping, new value won't reach node.
To get new value node has to request it from controller after waking up from sleep.

[dbemowsk]

You can use that though to set the value that the node can grab. Are you wondering how to grab the value?

[benya]

@dbemowsk said:

You can use that though to set the value that the node can grab. Are you wondering how to grab the value?

I am trying to figure what values to pass to
void request(uint8_t childSensorId, uint8_t variableType, uint8_t destination);
Where are the corresponding values show up in Domoticz UI?

[dbemowsk]

I pull the thermostat mode from my thermostat bridge node like this:

    request( CHILD_ID_MODE, V_TEXT );

I have never used the destination attribute, so I can't speak to it's use, but using the childSensorId and variableType works for me. You still need to use the technique I described to set the MySensors child node from the dummy sensor though.

[loic13]

Hi @dbemowsk,
I'm trying to figure out the message format in the receive() function. Could you show an example of your receive() function ? I couldn't find the received message format.
Thank's

[dbemowsk]

You are going to use 2 things. message.type and message.data. The message.type in my scenario is V_TEXT, and message.data is the payload, which in my case is O, H, C or A, but can be whatever you pass from Domoticz. The code in your receive function would look something like this:

if (message.type == V_TEXT) {
  Serial.println("Received data" + String(message.data));
  //Here you would do something with message.data
}

If you have more than one child sensor sending V_TEXT data, you would then use an if statement or a switch/case to check message.sensor for the child ID of the sensor and process each as above.

if (message.type == V_TEXT) {
  if (message.sensor == 1) {
    Serial.println("Received data from child 1" + String(message.data));
    //Here you would do something with message.data for the first child
  } else if (message.sensor == 2) {
    Serial.println("Received data from child 2" + String(message.data));
    //Here you would do something with message.data for the second child
  }
}

Let us know if you have trouble.

[loic13]

That is perfect thanks a lot.

[A Former User]

@dbemowsk

At the moment I'm trying to send a text value from Domoticz with MySensors Gateway to one of my nodes.

I need to implement the "request" function in this node. So here's my question: what value did you assign to "CHILD_ID_MODE". I presume that's the ID of the dummy selector described in another topic on this forum? How did you obtain this value? Is it available somewhere in Domoticz UI?

Now I request a text value, but all I get is a blank message, cause I don't know what I should insert as "uint8_t childSensorId".

[gohan]

The child ID is something you define when you present the sensors of the node

[A Former User]

@gohan Yes, I understand, but when I create a dummy text sensor I can't define its child ID. Can I find it somewhere?

[gohan]

You have to create a sensor in the sensor node sketch, assign a child ID to it and present it like the others sensors during setup, then it should show on the controller. I can't be more specific because I haven't worked on text sensors yet

[A Former User]

@gohan Dummy sensors are created in Domoticz, they don't use the MySensors library, so one doesn't upload any sketches to Arduino :)

What I want to achieve specifically is to send outside temperature received from WeatherUnderground to one of my MySensors nodes.

[gohan]

I know, but if you don't create a sensor able to receive the value, you can't send anything to it through the mysensors network

[A Former User]

@gohan hey, now I get it!

got it working the way I wanted, thank you so much :D

[gohan]

Just for my curiosity, why are you using the temperature from weather underground? Is it just displayed on a screen?

[A Former User]

@gohan I'm doing a project for my master's thesis.

There's a mathematical thermal model of a building running on MySensors node. I wanted to supply it with an information about actual outside temperature to have accurate results.

[gohan]

A real mysensors project would require an external node with temperature and humidity sensor 😁