[solved]Set variable from rule

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Hello community,

I have a load sensor that publishes the current weight every one second to a logfile. I want to read this file and send the value via MQQT to the broker.

At first I need a rule to set a temporary variable and send the value afterwards.

if every 1 second then $loadcell.loadcell = execute "tail -1 /home/pi/hx711/loadcell.log"

How could I write a value into my variable?

The variable is declared like this:

{
      "id": "loadcell",
      "name": "loadcell",
      "class": "VariablesDevice",
      "variables": [
        {
          "name": "loadcell",
          "expression": "$value",
          "type": "string"
        }
      ]
   },

The second part is easy and works allready

if every 1 second then publish mqtt message "\{\"weight\":\{\"value\":\"$loadcell.loadcell\", \"unit\":\"g\"\}\}:retain" on topic "MyTopic/Scale"

I found a better solution. Use a ShellSensor.

{
      "id": "loadcell",
      "name": "LoadCell",
      "class": "ShellSensor",
      "attributeName": "weight",
      "attributeType": "string",
      "attributeUnit": "g",
      "command": "sudo tail -1 /home/pi/hx711/loadcell.log",
      "interval": 1000
}

What method are you using to get data input into that log? I only found HX711 solutios which worked in terminal.