I will give your suggestion a go next week when I have a little more time and report back.

According to https://www.json.org/json-en.html "123" is valid JSON.

I'm trying to reconfigure a moisture sensor.

In the Hardware Configuration I'm trying to replace the path tele/HygroWiFi01/SENSOR//ANALOG/A0

with the path 325A272640/io2

The second value is a string not an integer

The system can receive the messages in the JSON format.

It is important to understand the format of the message you are receiving from the sensor. There are some SW you can use to read the MQTT messages, if you can access the system using the SSH, then you can try with mosquito client.

Let's assume the MQTT topic is "325A272640" and the message has the json format as for example {"io2":"124"}

then the string to set in the system should be the following:

325A272640//io2

(first part before the // is the topic, after the // are the ison fields)

the above are just assumptions. Better if you can provide the Topic and the Message.

Topic: 325A272640/io2

Value: "123"