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Andrea Ceroni [email protected] @andrekiba http://www.linkedin.com/in/andreaceroni elfo.net klabcommunity.org 

Think in Real-time with Xamarin and Azure SignalR 

Xamarin.Forms 

Azure SignalR Service https://docs.microsoft.com/en-us/azure/azure-signalr/signalr-overview 

Pricing 

Demo 

Use SignalR Service Scale an ASP.NET Core SignalR App integrate with ASP.NET Core (based on this) allows to scale-out the number of connections Build serveless real-time apps using Azure Functions (v2) bindings it is possible to "react" to a whole series of events (storage, queue, http trigger...) Send messages from server to client with the REST API integrate with other apps that they can call the API and "push" informations to the clients tips... 

Concepts Transports based on the server and client capabilities SignalR choose the best transport among WebSocket, Server-Sent Events e Long Polling Hubs an hub is a high level pipeline which allows clients and servers to call each other, passing "strongly-typed" parameters to the methods. The message contains the name of the method to be invoked and the related parameters. Therefore exists a real "contract" between client and server 

With our without ASP.NET Core SignalR Azure SignalR Service Xamarin ASP.NET Core SignalR Server Hub Web App Console App Azure SignalR Service Server Endpoint Client Endpoint Xamarin Web App Console App What you want REST API 

ASP.NET Core SignalR vs SignalR Service Persistent Connection Client App Server Azure SignalR Service Client App Server Persistent Connection Persistent Connection Negotiate 

Different connections Server connections Persistent websocket connetcions are opened between SignalR Service and SignalR Server (5 by default), used for two-way communications with clients Client connections Clients are connected directly to SignalR Service, url and access token are resolved by the endpoint "negotiate" Data transmit 1 to 1 mapping between client connection and relative server connection that takes charge of it. Therefore SignalR Service acts as a transport layer between server and clients, completely managing the connections (scalability) 

Meeting Rooms Microsoft Graph Meeting Room API Azure SignalR 

SignalR Service Bindings for Azure Functions https://docs.microsoft.com/it-it/azure/azure-functions/functions-bindings-signalr-service#2x-c-input-examples 

Server-less Architecture with Azure Functions Client Azure SignalR Service Persistent Connection Azure Functions negotiate Negotiate broadcast 

Microsoft Graph API https://docs.microsoft.com/en-us/graph/api/overview?view=graph-rest-1.0 

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Demo 

[FunctionName(" Question")] public async Task Question( [HttpTrigger(AuthorizationLevel.Anonymous, "post")] Question question, [SignalR(HubName = "Q&A")] IAsyncCollector answers) { var answer = iKnowTheAnswer J ? question.GetAnswer() : ... L ... return await answers.AddAsync(new SignalRMessage { Target = " Answer", Arguments = new [ ] { answer } }); } 

Links https://github.com/andrekiba/Gab19 https://docs.microsoft.com/en-us/azure/azure-signalr/signalr-overview https://github.com/Azure/azure-signalr/blob/dev/docs/rest-api.md https://docs.microsoft.com/it-it/azure/azure-functions/functions-bindings-signalr-service#2x-c-input-examples https://github.com/Azure/azure-signalr/blob/dev/docs/faq.md#service-mode https://docs.microsoft.com/en-us/graph/api/overview?view=graph-rest-1.0 

Thanks! [email protected] [email protected] @andrekiba http://github.com/andrekiba http://www.linkedin.com/in/andreaceroni https://creativecommons.org/licenses/by-nc-sa/3.0/