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Question

Hello,
I have create a resource IoTHubOnzoControls and I am sending data from my arduino hardware to a device I created under IoTHubOnzoControls . I can see data getting sent from hardware to IotHub but not sure how to visualize it in Azure.
I tried creating stream analytics job and specified input and outputs. But when I query the input , its says there is no data. I am not sure now where is the data which was sent from hardware to IotHub. I am beginner and need your help.

many thanks
Vishal

Answer 1

Hello @Vishal Kaushik

There are several ways to check for incoming telemetry.

First of all, the IoT HUb shows the metrics of incoming DEvice to Cloud messages in a chart:

Next to that, Microsoft provides this Azure IoT Explorer which shows the messages received by your IoT Hub:

The Azure CLI for IoT Hub offers a similar command-line approach.

So you are able to check the first entry point of the incoming telemetry. After that, you just have to chain the Azure resources correctly.

Note1: some of the tools need an IoT hub connection string. guard this connection string because it provides access to your hub. Normally this string should not leave the Azure portal.

Note2: learn about IoT hub consumer groups. It's better to give each tool a separate IoT hub consumer group to prevent the tool 'is eating up' messages which should be sent to another resource.