decoding mqtt messages from esp8266

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My pimatic is up and running since a couple of years.Meantime I installed some devices on mqtt base, most of them run successful. Since today I installed a moisture sensor, based on a esp8266 an tasmota.
The sensor works very well, but I think I made some mistakes by adding it to pimatic.
in mqttfx I find the sensor, the message looks like this:

Device : tele/FS/SENSOR

  "Time" : "2021-05-27T23:10:08",
  "ANALOG" : {
    "A0" : 747
  }
}
or:
{"Time":"2021-05-27T23:32:08","ANALOG":{"A0":748}} 

(both the same)
This looks very good. I get an information from the analog input of my esp with the actual value of 747. thats ok.

But in pimatic I only get the message: “unknown” and the info

ANALOG.A0: NaN @ 00:20:08GraphEdit Device

I configured in pimatic a mqtt device , mqttsensor with a device named ANALOG.A0
topic is /tele/FS/Sensor, type I tried numeric also as string. I compared serveral times all the things i know about this device, I do not see my mistake. Perhaps there is someone who can see the wrong thing.
thanks a lot in advance.

What happens if you use A0 as name (instead of ANALOG.A0)

I tried it, no really change.
Now I get the message

A0: undefined @ 14:14:27Edit Device

when I look at the information field of the device.

here is the actual part of the config.json:

 {
      "brokerId": "myBroker",
      "attributes": [
        {
          "name": "A0",
          "topic": "/tele/FS/SENSOR",
          "type": "string",
          "messageMap": {}
        }
      ],
      "xAttributeOptions": [],
      "id": "bodenfeuchte",
      "name": "Bodenfeuchte",
      "class": "MqttSensor"
    }

This is the other device description that I used before

 {
      "brokerId": "myBroker",
      "attributes": [
        {
          "name": "ANALOG.A0",
          "topic": "/tele/FS/SENSOR",
          "type": "number",
          "messageMap": {}
        }
      ],
      "xAttributeOptions": [],
      "id": "bodenfeuchte",
      "name": "Bodenfeuchte",
      "class": "MqttSensor"
    }

both of them don’t give me a value.
Also it does not matter if it is number or string.

In MqttFx you can also send a message to the /tele/FS/SENSOR topic.
if you use the json formatted message like {“Time”:“2021-05-27T23:32:08”,“ANALOG”:{“A0”:748}}, you can play with it and see how the pimatic MQTT sensor is reacting.
Seems you need to set the sensor name to ANALOG.A0, but thats also something to can play with

I have no really idea why, but now it works.
I took an older device, mqttsensor for temperature, changed the topic to ANALOG.A0 and the device to tele/FS/SENSOR and got the value.
Don’t ask me why. Thanks again for your support.