Azure Function App Erro

Question

Hi Everyone,

I am currently working as a newcomer in the realm of Azure Digital Twins. I am reaching out to seek your expertise on a particular issue I've encountered. In my current project, I am utilizing TwinCAT3 to establish connectivity with Azure IoT Hub, employing MQTT and JSON functionalities. I am pleased to say that I have successfully managed to transmit data into the Azure IoT Hub. However, I have encountered a challenge in the subsequent step of my process. I have developed a function app with the intention of facilitating the transfer of data from the IoT Hub to Azure Digital Twins. Regrettably, I have encountered an error message stating: 'Error in ingest function: Cannot access child value on Newtonsoft.Json.Linq.JValue.' as shown in the image. Kindly help me with this. I have already contacted Azure regarding this but they say that it needs to be in the form of JSON for this message to go and I also checked from the twincat side that it is JSON. Not sure where I am going wrong. I am using the C# function app sdk for this. Thanks.

Answer 1

Hello @Jayashri Goddanti ,

welcome to this moderated Azure community forum.

The body you get in the Azure Function is a BASE64 version of that JSON string seen in the IoT Explorer preview.

Please decode the body BASE64 string to JSON using the programming language (like C#) you use (every language has libraries for BASE64).

You can check this decoding with websites like this.

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