In case when your payload a bit more complicated than a flat JSON, then you may add a data converter which translate a payload to the Widgelix.
Create your first Data Converter
Go to Data Converters on the left menu sidebar

Input Name and start to implement your JS converter in the editor
For an instance let’s define some JSON payload
{
"deviceId": "00DFACE6573412",
"temperature": {
"in": 28,
"out": 15,
"somewhere": 296
},
"pressure": {
"space": -726,
"earth": 726
}
}
With the data converter we can easily translate this payload to the Widgelix
function (payload) {
const json = JSON.parse(payload)
let result = {}
const topLevelKeys = Object.keys(json)
const isObject = ({}).constructor
for (const topLevelKey of topLevelKeys) {
const subLevelKeys = Object.keys(json[topLevelKey])
if (json[topLevelKey] !== isObject) {
result[topLevelKey] = json[topLevelKey]
continue
}
for (const subLevelKey of subLevelKeys) {
result[`${topLevelKey}-${subLevelKey}`] = json[topLevelKey][subLevelKey]
}
}
return result
}
Then you can test Data Converter with sample payload

Finally, click on the Save button and you may assign the converter with a Device Type