Requesting value from Domoticz

[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 😁

[A Former User]

@gohan This model is just a small part of my project. But I get your concept.

There's already a DHT11 node running inside my house, measuring quantities that you've mentioned.

[mar.conte]

@tomek_olo
Sorry what is the way for send from domoticz child -node to other node through lua script for example Tanks

[A Former User]

@mar.conte I don't understand your question. Can you clarify, please?

[mar.conte]

@tomek_olo
Sorry what is the way for send from domoticz child -node to other node through lua script for example Tanks

[A Former User]

@mar.conte

OK, I'll try to describe everything I've done to get it working:

1. I'm presenting MySensors node to Domoticz as S_INFO: "present(CHILD_ID, S_INFO);"
2. Next step is to add this node in your Domoticz. It should be visible at first in "Devices" as a "Text" device. After you add it it will be present in the "Utility" tab.
3. Now you have to edit a text value of this device in Domoticz. (I think that's what interests you but in reverse) I'm using a "Device" script that updates this text value with outside temperature every time the weather is updated:

commandArray = {}
local tempOut = devicechanged["Outside_Temperature"]
local tempOutIdx = 25

if ( devicechanged["Outside"]) then
commandArray['UpdateDevice'] = otherdevices_idx['TextNode']..'|1|'..tempOut
end

4. Now when I want to download this new value to my node I use "request( CHILD_ID, V_TEXT );" and inside "receive()" function:

if (message.type == V_TEXT) {
if (message.sensor == CHILD_ID) {
outTemp = message.getFloat();
}
}

That's all, it's complicated. If you have any questions feel free to ask. I'll do my best to help.

[gohan]

If the temperature sensor is also running on a mysensors node, you can send the value from the node to the one with lcd screen directly without using the controller.