IoT Hub Queue single client

Question

IoT Hub Queue single client

SDK for Embedded C IoT Hub Samples on Windows 31

Hi,
I have two devices on my IoT Hub , they are sending data to a queue, using service bus and stream analytics job.

Using the Python SDK and the example - Receive messages from a queue, i can see all the messages arriving from the IoT Hub with no problem.

My question is :

Is there a mode to read in the example, the messages from only one device and not from the other ( point to point communication )?

So read the messages from only one device.

My main final project, is to receive the data on an android app from a single device connected to the IoT Hub.

Thanks.

SDK for Embedded C IoT Hub Samples on Windows 31 Reputation points

2022-07-28T07:17:03.257+00:00

Thanks for the answer.
My architecture is the following:
I have a device that connects and communicates with my IoT Hub with mqqt (no sdk).
So far i can provision the device, read/write to the device twin, read messages from the cloud and send methods.

I have created a service bus with a topic and the Stream Analytic Job to send the data out of the IoT Hub.
In the output of the bus i can receive all the messages from the IoT Hub and the resource group.

Now i want to make an android app to visualize some data from the devices and send an initial configuration to the devices.
Every device will have a different configuration. So one client (my android app) for one device.

Here i want your advice on how to achieve all that. ( I am not a cloud engineer, i am learning now ).

First for the initial configuration send the settings with a method and put all the data inside.
After receive the configuration, update the device twin with the new configuration.

For sending data to the android app, i found Send push notifications to Android devices,
Notification Hub (Push to device: You can target notifications to individual devices ).
I read that, i can choose using tags the receiver of the notification.

So if i understood well, can i put a unique tag inside the mqtt message to send, so reading this tag i send the notification data to only one app?
Is this the same tag in IoT Hub and the Notification Hub?

Thanks.
SDK for Embedded C IoT Hub Samples on Windows 31 Reputation points

2022-07-28T07:17:16.897+00:00

Thanks for the answer.
My architecture is the following:
I have a device that connects and communicates with my IoT Hub with mqqt (no sdk).
So far i can provision the device, read/write to the device twin, read messages from the cloud and send methods.

I have created a service bus with a topic and the Stream Analytic Job to send the data out of the IoT Hub.
In the output of the bus i can receive all the messages from the IoT Hub and the resource group.

Now i want to make an android app to visualize some data from the devices and send an initial configuration to the devices.
Every device will have a different configuration. So one client (my android app) for one device.

Here i want your advice on how to achieve all that. ( I am not a cloud engineer, i am learning now ).

First for the initial configuration send the settings with a method and put all the data inside.
After receive the configuration, update the device twin with the new configuration.

For sending data to the android app, i found Send push notifications to Android devices,
Notification Hub (Push to device: You can target notifications to individual devices ).
I read that, i can choose using tags the receiver of the notification.

So if i understood well, can i put a unique tag inside the mqtt message to send, so reading this tag i send the notification data to only one app?
Is this the same tag in IoT Hub and the Notification Hub?

Thanks.

Answer accepted by question author

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Your answer

SDK for Embedded C IoT Hub Samples on Windows 31 Reputation points

2022-07-28T07:17:03.257+00:00

Thanks for the answer.
My architecture is the following:
I have a device that connects and communicates with my IoT Hub with mqqt (no sdk).
So far i can provision the device, read/write to the device twin, read messages from the cloud and send methods.

I have created a service bus with a topic and the Stream Analytic Job to send the data out of the IoT Hub.
In the output of the bus i can receive all the messages from the IoT Hub and the resource group.

Now i want to make an android app to visualize some data from the devices and send an initial configuration to the devices.
Every device will have a different configuration. So one client (my android app) for one device.

Here i want your advice on how to achieve all that. ( I am not a cloud engineer, i am learning now ).

First for the initial configuration send the settings with a method and put all the data inside.
After receive the configuration, update the device twin with the new configuration.

For sending data to the android app, i found Send push notifications to Android devices,
Notification Hub (Push to device: You can target notifications to individual devices ).
I read that, i can choose using tags the receiver of the notification.

So if i understood well, can i put a unique tag inside the mqtt message to send, so reading this tag i send the notification data to only one app?
Is this the same tag in IoT Hub and the Notification Hub?

Thanks.
SDK for Embedded C IoT Hub Samples on Windows 31 Reputation points

2022-07-28T07:17:16.897+00:00

Thanks for the answer.
My architecture is the following:
I have a device that connects and communicates with my IoT Hub with mqqt (no sdk).
So far i can provision the device, read/write to the device twin, read messages from the cloud and send methods.

I have created a service bus with a topic and the Stream Analytic Job to send the data out of the IoT Hub.
In the output of the bus i can receive all the messages from the IoT Hub and the resource group.

Now i want to make an android app to visualize some data from the devices and send an initial configuration to the devices.
Every device will have a different configuration. So one client (my android app) for one device.

Here i want your advice on how to achieve all that. ( I am not a cloud engineer, i am learning now ).

First for the initial configuration send the settings with a method and put all the data inside.
After receive the configuration, update the device twin with the new configuration.

For sending data to the android app, i found Send push notifications to Android devices,
Notification Hub (Push to device: You can target notifications to individual devices ).
I read that, i can choose using tags the receiver of the notification.

So if i understood well, can i put a unique tag inside the mqtt message to send, so reading this tag i send the notification data to only one app?
Is this the same tag in IoT Hub and the Notification Hub?

Thanks.

Answer 1

Sander van de Velde | MVP 37,066 MVP

Hello @SDK for Embedded C IoT Hub Samples on Windows ,

you want to give certain users access to certain devices.

This means you have to have a mapping at some point between a user and a device.

So, if an IoT message arrives, you want to execute some logic that makes the decision on what to do with that message (eg. sending the message to a certain Websocket/SignalR client/etc.).

There are a number of ways to do this (it also depends on how you communicate with devices) but here are a number of ways to do this:

just create a database table (eg. in CosmosDB or SqlAzure) or Azure Storage Table and check this every time a message arrives
Use a Stream Analytics Job and join the mapping as reference data and output to the logic which sends the data
Make use of a tag in the Azure IoT device twin and enrich incoming messages with that tag while routing to the logic (eg. an Azure function having the IoT Hub trigger)

These first two need more Azure resources but managing the tables is much more easy.

The third solution is simple but you need to have knowledge about the Device Twin and how to manipulate it.

SDK for Embedded C IoT Hub Samples on Windows 31 Reputation points

2022-07-28T07:28:14.133+00:00

Thanks for the answer.
My architecture is the following:
I have a device that connects and communicates with my IoT Hub with mqtt (no sdk).
So far i can provision the device, read/write to the device twin, read messages from the cloud and send methods.

I have created a service bus with a topic and the Stream Analytic Job to send the data out of the IoT Hub.
In the output of the bus i can receive all the messages from the IoT Hub and the resource group.

Now i want to make an android app to visualize some data from the devices and send an initial configuration to the devices.
Every device will have a different configuration. So one client (my android app) for one device.

Here i want your advice on how to achieve all that. ( I am not a cloud engineer, i am learning now ).

First for the initial configuration send the settings with a method and put all the data inside.
After receive the configuration, update the device twin with the new configuration.

For sending data to the android app, i found Send push notifications to Android devices,
Notification Hub (Push to device: You can target notifications to individual devices ).
I read that, i can choose using tags the receiver of the notification.

So if i understood well, can i put a unique tag inside the mqtt message to send, so reading this tag i send the notification data to only one app?
Is this the same tag in IoT Hub and the Notification Hub?

Thanks.
Sander van de Velde | MVP 37,066 Reputation points MVP

2022-07-28T14:18:08.837+00:00
Hello @SDK for Embedded C IoT Hub Samples on Windows ,

The architecture you describe is not that complex but you need to put several things in place:

Have your devices connected to the IoT Hub. Data flows into the IoT Hub

enrich the incoming messages with the mapping towards the correct user/mobile device

Have a way of communication towards devices

Route the messages to that communication layer, probably with Azure Functions

You want to send data to mobile devices. I recommend checking out Azure Web PubSub or the high-level Azure SignalR services.

Or check out Blazor. Here is a blog post on how to use Blazor for web pages. If you know C#, this will help you a lot.

I see a lot of traction regarding .Net Maui. This could also be a great solution for mobile applications, connected to the cloud backend for telemetry updates.

If you want to create a cloud solution, start learning using the training modules in MS Learn.

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IoT Hub Queue single client

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