Quickstart: Broadcast real-time messages from console app

Azure SignalR Service provides REST API to support server to client communication scenarios, such as broadcasting. You can choose any programming language that can make REST API call. You can post messages to all connected clients, a specific client by name, or a group of clients.

In this quickstart, you will learn how to send messages from a command-line app to connected client apps in C#.

Prerequisites

This quickstart can be run on macOS, Windows, or Linux.

If you don't have an Azure subscription, create an Azure free account before you begin.

Having issues? Try the troubleshooting guide or let us know.

Sign in to Azure

Sign in to the Azure portal using your Azure account.

Having issues? Try the troubleshooting guide or let us know.

In this section, you'll create a basic Azure SignalR instance to use for your app. The following steps use the Azure portal to create a new instance, but you can also use the Azure CLI. For more information, see the az signalr create command in the Azure SignalR Service CLI Reference.

  1. Sign in to the Azure portal.
  2. In the upper-left side of the page, select + Create a resource.
  3. On the Create a resource page, in the Search services and marketplace text box, enter signalr and then select SignalR Service from the list.
  4. On the SignalR Service page, select Create.
  5. On the Basics tab, you'll enter the essential information for your new SignalR Service instance. Enter the following values:
Field Suggested Value Description
Subscription Choose your subscription Select the subscription you want to use to create a new SignalR Service instance.
Resource group Create a resource group named SignalRTestResources Select or create a resource group for your SignalR resource. It's useful to create a new resource group for this tutorial instead of using an existing resource group. To free resources after completing the tutorial, delete the resource group.

Deleting a resource group also deletes all of the resources that belong to the group. This action can't be undone. Before you delete a resource group, make certain that it doesn't contain resources you want to keep.

For more information, see Using resource groups to manage your Azure resources.
Resource name testsignalr Enter a unique resource name to use for the SignalR resource. If testsignalr has already been used in your region, add a digit or character until the name is unique.

The name must be a string of 1 to 63 characters and contain only numbers, letters, and the hyphen (-) character. The name can't start or end with the hyphen character, and consecutive hyphen characters aren't valid.
Region Choose your region Select the appropriate region for your new SignalR Service instance.

Azure SignalR Service isn't currently available in all regions. For more information, see Azure SignalR Service region availability
Pricing tier Select Change and then choose Free (Dev/Test Only). Choose Select to confirm your choice of pricing tier. Azure SignalR Service has three pricing tiers: Free, Standard, and Premium. Tutorials use the Free tier, unless noted otherwise in the prerequisites.

For more information about the functionality differences between tiers and pricing, see Azure SignalR Service pricing
Service mode Choose the appropriate service mode for this tutorial Use Default for ASP.NET. Use Serverless for Azure Functions or REST API.

Classic mode isn't used in the Azure SignalR tutorials.

For more information, see Service mode in Azure SignalR Service.

You don't need to change the settings on the Networking and Tags tabs for the SignalR tutorials.

  1. Select the Review + create button at the bottom of the Basics tab.
  2. On the Review + create tab, review the values and then select Create. It will take a few moments for deployment to complete.
  3. When the deployment is complete, select the Go to resource button.
  4. On the SignalR resource screen, select Keys from the menu on the left, under Settings.
  5. Copy the Connection string for the primary key. You'll need this connection string to configure your app later in this tutorial.

Having issues? Try the troubleshooting guide or let us know.

Clone the sample application

While the service is deploying, let's switch to prepare the code. Clone the sample app from GitHub, set the SignalR Service connection string, and run the application locally.

  1. Open a git terminal window. Change to a folder where you want to clone the sample project.

  2. Run the following command to clone the sample repository. This command creates a copy of the sample app on your computer.

    git clone https://github.com/aspnet/AzureSignalR-samples.git
    

Having issues? Try the troubleshooting guide or let us know.

Build and run the sample

This sample is a console app showing the use of Azure SignalR Service. It provides two modes:

  • Server Mode: use simple commands to call Azure SignalR Service REST API.
  • Client Mode: connect to Azure SignalR Service and receive messages from server.

Also you can find how to generate an access token to authenticate with Azure SignalR Service.

Build the executable file

We use macOS osx.10.13-x64 as example. You can find reference on how to build on other platforms.

cd AzureSignalR-samples/samples/Serverless/

dotnet publish -c Release -r osx.10.13-x64

Start a client

cd bin/Release/netcoreapp2.1/osx.10.13-x64/

Serverless client <ClientName> -c "<ConnectionString>" -h <HubName>

Start a server

cd bin/Release/netcoreapp2.1/osx.10.13-x64/

Serverless server -c "<ConnectionString>" -h <HubName>

Having issues? Try the troubleshooting guide or let us know.

Run the sample without publishing

You can also run the command below to start a server or client

# Start a server
dotnet run -- server -c "<ConnectionString>" -h <HubName>

# Start a client
dotnet run -- client <ClientName> -c "<ConnectionString>" -h <HubName>

Use user-secrets to specify Connection String

You can run dotnet user-secrets set Azure:SignalR:ConnectionString "<ConnectionString>" in the root directory of the sample. After that, you don't need the option -c "<ConnectionString>" anymore.

Having issues? Try the troubleshooting guide or let us know.

Usage

After the server started, use the command to send message:

send user <User Id>
send users <User List>
send group <Group Name>
send groups <Group List>
broadcast

You can start multiple clients with different client names.

Having issues? Try the troubleshooting guide or let us know.

Integration with third-party services

The Azure SignalR service allows third-party services to integrate with the system.

Definition of technical specifications

The following table shows all the versions of the REST APIs supported to date. You can also find the definition file for each specific version

Version API State Door Specific
1.0-preview Available 5002 Swagger
1.0 Available Standard Swagger

The list of available APIs for each specific version is available in the following list.

API 1.0-preview 1.0
Broadcast to all
Broadcast to a group
Broadcast to some groups (Deprecated) N / A
Send to a user
Send to some users (Deprecated) N / A
Adding a user to a group N / A
Removing a user from a group N / A
Check user existence N / A
Remove a user from all groups N / A
Send to a connection N / A
Add a connection to a group N / A
Remove a connection from a group N / A
Close a client connection N / A
Service Health N / A

Broadcast to everyone

Version API HTTP Method Request URL Request body
1.0-preview POST https://<instance-name>.service.signalr.net:5002/api/v1-preview/hub/<hub-name> {"target": "<method-name>", "arguments": [...]}
1.0 POST https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name> Same as above

Broadcast to a group

Version API HTTP Method Request URL Request body
1.0-preview POST https://<instance-name>.service.signalr.net:5002/api/v1-preview/hub/<hub-name>/group/<group-name> {"target": "<method-name>", "arguments": [...]}
1.0 POST https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name> Same as above

Sending to a user

Version API HTTP Method Request URL Request body
1.0-preview POST https://<instance-name>.service.signalr.net:5002/api/v1-preview/hub/<hub-name>/user/<user-id> {"target": "<method-name>", "arguments": [...]}
1.0 POST https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/users/<user-id> Same as above

Adding a user to a group

Version API HTTP Method Request URL
1.0 PUT https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/users/<user-id>

Removing a user from a group

Version API HTTP Method Request URL
1.0 DELETE https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/users/<user-id>

Check user existence in a group

API Version API HTTP Method Request URL
1.0 GET https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/users/<user-id>/groups/<group-name>
1.0 GET https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/users/<user-id>
Response Status Code Description
200 User exists
404 User not exists

Remove a user from all groups

API Version API HTTP Method Request URL
1.0 DELETE https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/users/<user-id>/groups

Send message to a connection

API Version API HTTP Method Request URL Request Body
1.0 POST https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id> { "target":"<method-name>", "arguments":[ ... ] }

Add a connection to a group

API Version API HTTP Method Request URL
1.0 PUT https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/connections/<connection-id>
1.0 PUT https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>/groups/<group-name>

Remove a connection from a group

API Version API HTTP Method Request URL
1.0 DELETE https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/connections/<connection-id>
1.0 DELETE https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>/groups/<group-name>

Close a client connection

API Version API HTTP Method Request URL
1.0 DELETE https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>
1.0 DELETE https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>?reason=<close-reason>

Service Health

API Version API HTTP Method Request URL
1.0 GET https://<instance-name>.service.signalr.net/api/v1/health
Response Status Code Description
200 Service Good
5xx Service Error

Having issues? Try the troubleshooting guide or let us know.

Clean up resources

If you're not going to continue to use this app, delete all resources created by this quickstart with the following steps so you don't incur any charges:

  1. In the Azure portal, select Resource groups on the far left, and then select the resource group you created. Alternatively, you may use the search box to find the resource group by its name.

  2. In the window that opens, select the resource group, and then click Delete resource group.

  3. In the new window, type the name of the resource group to delete, and then click Delete.

Having issues? Try the troubleshooting guide or let us know.

Next steps

In this quickstart, you learned how to use REST API to broadcast real-time message from SignalR Service to clients. Next, learn more about how to develop and deploy Azure Functions with SignalR Service binding, which is built on top of REST API.