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Thank you, Chris, that was exactly my problem. Viessmann seems to have changed the position in the array. I took the liberty of expanding your flow with an additional function to make it somewhat more dynamic. It is possible to find the correct element using the deviceType property in the array. The correct property has the value "heating." Here is my function to select the element:   var deviceArray = msg.payload.data; var pos = deviceArray.findIndex((element) => element.deviceType === 'heating'); msg.payload=msg.payload.data[pos].id; return msg; ... Mehr anzeigen

Hello, I know this is an old thread, but I have the same problem since January 31, 2024, at 12:25. My code had been running for exactly 230 days then I started receiving a Status Code 200, but the data is empty.   https://api.viessmann.com/iot/v1/features/installations/{{installationID}}/gateways/{{gatewaySerial}}/devices/{{deviceId}}/features/ ... Mehr anzeigen