Microsoft Azure iot-hub: The measured senosor values sent via device to iot-hub cannot be read stored Json data

Question

We are using a data acquisition system as a device and send some signals values via MQTT protocol into a container which is assigned to an iot-hub. The connection works well between device and iot-hub, and we receive some JSON data. When we open a JSON data, We cannot read the temperature values in "Body" inside the JSON data, since they are encoded. I would be thankful if you tell us, how we should automatically convert the JSON data to a proper format so that we could read the values in numbers?

Please find below three of our code's lines in JSON Data. The rest of the lines are the same, but they are encoded differently.

{"EnqueuedTimeUtc":"2022-02-09T10:00:30.8600000Z","Properties":{"Sensor":""},"SystemProperties":{"connectionDeviceId":"Iba","connectionAuthMethod":"{"scope":"device","type":"sas","issuer":"iothub","acceptingIpFilterRule":null}","connectionDeviceGenerationId":"637799949903534194","enqueuedTime":"2022-02-09T10:00:30.8600000Z"},"Body":"My42MjI3NTQ="}

{"EnqueuedTimeUtc":"2022-02-09T10:00:30.8750000Z","Properties":{"Sensor":""},"SystemProperties":{"connectionDeviceId":"Iba","connectionAuthMethod":"{"scope":"device","type":"sas","issuer":"iothub","acceptingIpFilterRule":null}","connectionDeviceGenerationId":"637799949903534194","enqueuedTime":"2022-02-09T10:00:30.8750000Z"},"Body":"My42ODEyNDY="}

{"EnqueuedTimeUtc":"2022-02-09T10:00:30.9070000Z","Properties":{"Sensor":""},"SystemProperties":{"connectionDeviceId":"Iba","connectionAuthMethod":"{"scope":"device","type":"sas","issuer":"iothub","acceptingIpFilterRule":null}","connectionDeviceGenerationId":"637799949903534194","enqueuedTime":"2022-02-09T10:00:30.9070000Z"},"Body":"My43Mzk1OTI="}

Thanks in advance!

Br Masoud

Answer 1

you should add to the message topic two parameters such as the content-type (ct) and content-encoding (ce) like is shown in the following example:

 devices/device1/messages/events/$.ct=application%2Fjson&$.ce=utf-8