Azure IoT Hub Message Routing Encoding

Question

Hi, I have setup an IoT Hub account, and configure my device to send data to the IoT hub, I am redirecting the message to storage.

When I monitor the device data using Azure IoT Explorer, I am receiving data in JSON format like below:

{
  "body": {
    "state": {
      "reported": {
        "4": 0,
        "16": 99198,
        "21": 4,
        "66": 12549,
        "67": 3972,
        "68": 0,
        "69": 2,
        "72": 209,
        "73": 210,
        "76": "0xA03CA3F64973BE28",
        "77": "0xA63C73F649F8C228",
        "181": 0,
        "182": 0,
        "200": 0,
        "239": 1,
        "240": 0,
        "241": 50219,
        "ts": 1713336761000,
        "pr": 0,
        "latlng": "0.000000,0.000000",
        "alt": 0,
        "ang": 0,
        "sat": 0,
        "sp": 0,
        "evt": 0
      }
    }
  },
  "enqueuedTime": "Wed Apr 17 2024 14:53:46 GMT+0800 (Singapore Standard Time)"
}

But When I check the files created in the storage when I re-route the message in the storage, I am getting the following format. I wonder how can I receive the original message format instead of the encoded format?

{"EnqueuedTimeUtc":"2024-04-17T06:49:17.8780000Z","Properties":{},"SystemProperties":{"connectionDeviceId":"1234567890","connectionAuthMethod":"{\"scope\":\"hub\",\"type\":\"sas\",\"issuer\":\"iothub\",\"acceptingIpFilterRule\":null}","connectionDeviceGenerationId":"638487721780314648","enqueuedTime":"2024-04-17T06:49:17.8780000Z"},"Body":"eyJzdGF0ZSI6eyJyZXBvcnRlZCI6eyJ0cyI6MTcxMzMzNjQ5MTAwMCwicHIiOjAsImxhdGxuZyI6IjAuMDAwMDAwLDAuMDAwMDAwIiwiYWx0IjowLCJhbmciOjAsInNhdCI6MCwic3AiOjAsImV2dCI6MCwiMjM5IjoxLCIyNDAiOjAsIjIxIjo0LCIyMDAiOjAsIjY5IjoyLCIxODEiOjAsIjE4MiI6MCwiNjYiOjEyNDk0LCI2NyI6Mzk2OSwiNjgiOjAsIjI0MSI6NTAyMTksIjE2Ijo5OTE5OCwiNzIiOjIxMCwiNzMiOjIxMSwiNCI6MCwiNzYiOiIweEEwM0NBM0Y2NDk3M0JFMjgiLCI3NyI6IjB4QTYzQzczRjY0OUY4QzIyOCJ9fX0="}

Thanks for any input for my queries.

Best regards,

Yap

Answer 1

Hello @SoonJoo@Genting ,

welcome to this moderated Azure community forum.

The content of your message body is encoded as Base64 in the storage account.

It can be decoded with any Base64 decoder as seen with this online version:

Keep in mind, this is done to make your messages human readable inside the storage files, the message will be 'fly' as Json through Azure.

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