I am trying to figure out the best approach for this scenario.
I have a pir sensor attached to a raspberry pi that is sending telemetry data to a windows azure iot hub.
I want to trigger a push notification when this telemetry data is received?
Any help would be appreciated.
I would create an Azure Web Job to consume the data coming to the IoT Hub and call a Notification Hub.
This would look like this :
[Raspberry Pi] -> [IoT Hub] -> [Web Jobs] -> [Notification Hubs]
Here are the pointers to the 3 key components
https://azure.microsoft.com/en-us/documentation/services/iot-hub/
https://azure.microsoft.com/en-us/documentation/articles/websites-webjobs-resources/
https://azure.microsoft.com/en-us/documentation/services/notification-hubs/
You could use an Azure Function as a lighter alternative to a Web Jobs.
Related
I've got data coming into IoTHub and want to filter on them.
Relevant data I want to forward to slack as notification.
I've got the IoT Hub and a slack subscription in place and am having trouble connecting the two.
In order to do a rather complex time-based query, I figure to use Stream Analytics and configure the IoT Hub as input. From research I found Logic Apps can send messages to Slack over a webhook. Using a Service Bus Queue as output for Stream Analytics, I can get the data into Logic Apps.
So it's:
IoT Hub (ingest all data) => Stream Analytics (filter) => Service Bus Queue (queue up the data) => Logic Apps (send to Slack)
Looks a bit bulky but that seems to be one way of doing it (is there a better one?!?)
Doing this I ran into issues. I selected my IoT Hub as input for Stream Analytics and the simple query SELECT * INTO [Queue] FROM [Hub] fails, saying there was no data.
It does make sense if the IoT Hub just pushes new data to its endpoints and then discards it. So I created a test set in the Stream Analytics Job and the query runs fine.
However I do get data into the Hub which is not (all) picked up nor forwarded by the job to the service bus queue. I do see some activity on the queue but not nearly enough to be the data I receive.
This seems to be a very common scenario, ingesting data in IoT Hub and sending notifications to email or slack if they are of a certain type. Can you explain the steps to take or point me to a resource that does it. Maybe I'm on the wrong path as I cannot find anything that describes this.
Thanks
Currently I have simulated device that receives message from IoT Hub and processes it and after it is done, device sends message to IoT Hub. The device is working but it is running as .exe file on computer and Im trying to transform it and upload on Azure as function so I can avoid it not working when computer turns off or freezes while Im not around it.
I wanted to make it function triggered by events on IoT Hub but Im facing problem. Currently the function that sends message, sends it directly to device on IoTHub(my device) but in case like this, message is not "displayed" on IoT Hub so Im unable to use it as trigger. I'm unable to change function that sends message to device. Are there any options how to catch those messages on IoTHub or possibility to trigger it any other way?
There is no direct way to send messages from Azure function to Azure IoT Hub. You can probably utilize Device event Azure IoT Hub Rest API end point from the Azure Function and send the message to the Azure IoT Hub. Here is the request you can make to send the message to Azure IoT Hub.
POST https://fully-qualified-iothubname.azure-devices.net/devices/{id}/messages/events?api-version=2020-03-13
Please find the following reference to all the Supported bindings for Azure Functions runtime
You can trigger the Azure Function by using the IoT Hub trigger. Refer the following resource that runs you through the steps needed to set up the Azure IoT Hub trigger for Azure Functions
Am working on Azure resources like Azure Service Bus, Azure Functions, IOT Hub. Here am trying to send queue messages from Azure Service Bus to IOT Hub using Azure functions and then display that messages in my local device (Cloud-To-Device). Am able to read my messages in Azure function using Service Bus Queue Trigger and tried to send them to IOT Hub as output of function. Once, when I run the Azure function "Its can sending the messages to IOT Hub as output",but it unable to send them to client device. Can you please suggest me to "How to solve this situation"
As far as I know there is currently no way to select a Cloud to Device Message(C2D) as a Azure Functions Output.
You also cannot use the Event Hub Output as it does not support C2D messages as described here.
I can think of 2 methods to accomplish C2D messaging in Azure functions:
Use the Azure IoT SDK as described in this answer and shown in this channel9 video from 2017 (might be out of date).
Use the Azure IoT Hub REST API. You can find general configuration options here and the API endpoint to use would be senddevicecommand.
Unfortunately there is current no output binding for IoT Hub from Functions (you could write a new custom binding, though ;) )
To talk from a Function to your devices, you need the Azure Device Service SDK of the IoT Hub. Then you can either use Cloud-to-Device messages (asynchronous) or Direct Methods (synchronous). You can find a example of the latter in my GitHub repo here: https://github.com/sebader/iotedge-end2end/blob/master/CloudFunctions/DirectMethodCaller.cs
The important pieces being:
ServiceClient _iothubServiceClient = ServiceClient.CreateFromConnectionString(config["iothubowner_cs"]);
var methodRequest = new CloudToDeviceMethod("YourDirectMethodName", TimeSpan.FromSeconds(10), TimeSpan.FromSeconds(10));
var result = await _iothubServiceClient.InvokeDeviceMethodAsync(device, module, methodRequest).ConfigureAwait(false);
An implementation for C2D messages will look pretty much the same.
I was using ThingSpeak for an IoT project. I've decided to move on with Azure IoT. My project consists Raspberry Pi 3's sending data to an IoT platform using MQTT protocol which will be displayed over mobile app.
While using ThingSpeak, things were easier. I was sending data to IoT platform, ThingSpeak was storing them without me configuring almost anything and mobile app that I wrote was sending HTTP request to IoT platform with an interval. Then, I was parsing JSON response on mobile app to display important values in real time.
So far I've managed to send datas to IoT hub using Azure IoT C SDK. However I am very confused about how I am going to implement these on Azure IoT, what my workflow should be like.
Azure IoT Hub ingests data from your devices into the cloud and then delivers that data to other destinations for storage or processing. By default, IoT Hub delivers data from devices to an Event Hubs compatible end point (these Quickstarts illustrate this process: https://learn.microsoft.com/azure/iot-hub/quickstart-send-telemetry-node). IoT Hub can also use routing rules to send data to other locations, such as storage or a Service Bus queue. The following tutorial illustrates these options for you: https://learn.microsoft.com/azure/iot-hub/tutorial-routing.
I am currently working on Internet Of Things, in my current project I was implemented the logic for to send temperature values to IoT Hub (using Raspberry PI2 and BMP280 sensor), in the azure part I created stream analytics job for receiving the messages from IoT Hub and filters those values based on my query like if temperature value exceeds 30 deg and post those filtered values to event hub is one of the output of the stream analytics job.
Query I wrote in stream analytics job.
SELECT
System.timestamp AS Time,
DeviceId,
RoomTemp,
RoomPressure,
RoomAlt
INTO
eventhub
FROM
bmpsensordata
WHERE RoomTemp>35
I was already created one event hub in azure, and monitor those filtered values by stream analytics job, in dashboard of event hub what I was created earlier.
But I want to send the values (filtered values by stream analytics job) of event hub to IoT Hub from that I will receive the values in the form of alert message/ notification using UWP App(C# language).
Please tell me how I can do it above scenario.
Regards,
Pradeep
I think that your solution could look like in the diagram I prepared:
Once data is retrieved from the IoT Hub and analyzed by Stream Analytics it can call Azure Function which triggers Azure Notification Hub to send push notification to your UWP application.
Please use my tutorial to see how to use Stream Analytics together with Azure function and at the end how to send SMS alerts - in your case you should replace the code with the one for Notification Hub:
https://github.com/Daniel-Krzyczkowski/Daniel-Krzyczkowski.github.io/blob/master/cloudyofthings/article1/index.md
Here is the documentation how to use Notification Hub SDK and how to integrate it with UWP applications:
https://learn.microsoft.com/en-us/azure/notification-hubs/notification-hubs-aspnet-backend-windows-dotnet-wns-notification
I think you will need another Stream Analytics job with Event Hub as input, and IoT Hub as output. Then you can receive the cloud-to-device messages from IoT Hub in your UWP application as described in this article.
You can have multiple output from a single Stream Analytics job. Refer to https://blogs.msdn.microsoft.com/streamanalytics/2015/09/16/query-pattern-of-the-week-send-data-to-multiple-outputs/ for more information on this.
Stream Analytics does not have a direct output to IoT hub though.
You'd need to put the info in to an EventHub and have a worker role process this and send the info from there in to IoT hub
Per my experience, I think you can try to integrate Notification Hub with IoTHub, Stream Analytics, Event Hub to implement your needs. Please see the details below.
Create a Stream Analytics Job with IoTHub as input and Event Hub as output for filtering sensor data.
Create a Notification Hub for pushing data to UWP app.
Create an server service or a scheduler job for receiving and sending the data from the Event Hub to the Notification Hub, such as continuous WebJob.
As references, there are some documents which show you how to do it.
Get started with Azure Stream Analytics to process data from IoT devices
, https://azure.microsoft.com/en-us/documentation/articles/stream-analytics-get-started-with-azure-stream-analytics-to-process-data-from-iot-devices/
Getting started with Notification Hubs for Windows Store Apps, https://azure.microsoft.com/en-us/documentation/articles/notification-hubs-windows-store-dotnet-get-started/
Event Hubs programming guide, https://azure.microsoft.com/en-us/documentation/articles/event-hubs-programming-guide/
Notification Hub Server SDK reference for .NET, https://msdn.microsoft.com/library/mt414893.aspx
Create a .NET WebJob in Azure App Service (run continuously), https://azure.microsoft.com/en-us/documentation/articles/websites-dotnet-webjobs-sdk-get-started/
Hope it helps.
Any concern, please feel free to let me know.