Internet of Things &.NET Gadgeteer & Microsoft SignalR Mirco Vanini IoT with SignalR &.NET Gadgeteer Microsoft® MVP Windows Embedded

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Internet of Things &.NET Gadgeteer & Microsoft SignalR Mirco Vanini IoT with SignalR &.NET Gadgeteer Microsoft MVP Windows Embedded Slide 2 Agenda Perch real-time e come ? SignalR Connections and Hubs Clients Demo Q&A Links Slide 3 Perch real-time e come ? Gli utenti vogliono le ultime informazioni, ORA ! Twitter live searches/updates Stock streamers Auctions Live scores Real-time notifications Interactive games Collaborative apps Live user analytics Slide 4 Perch real-time e come ? HTTP is an old beast Never designed for real-time communications Web is request-response Web is stateless HTML5 WebSockets to the rescue, right?WebSockets Extension to HTTP Provide raw sockets over HTTP Full-duplex Traverses proxies Its still a draft Not every proxy server supports it Not every webserver supports it Not every browser supports it They are raw sockets! Slide 5 Perch real-time e come ? Come implementare il real-time con HTTP: Polling. Long Polling. Forever Frame. Server Sent Events Slide 6 Perch real-time e come ? Polling: the stubborn approach Server Client Time: requests event n seconds (fixed time) Request Response delay Twitter clients Slide 7 Perch real-time e come ? Polling High overhead on requests: headers and such High overhead on response: same as before High latency. Waste of bandwith. Waste of resources. Slide 8 Perch real-time e come ? Long Polling: the kind gentleman approach Server Client Time: requests event n seconds (variable) Request Response Variable delay Facebook chat Slide 9 Perch real-time e come ? Long Polling (Hanging GET) High overhead on requests: headers and such High overhead on response: same as before Medium latency. Waste less of bandwith. Waste of resources. Better than the previous one: less requests Slide 10 Perch real-time e come ? HTTP/1.1 200 OK Content-Type: text/plain Transfer-Encoding: chunked Server tells client that response is chuncked Client keeps connection open untill server closes it Server pushes data to the client followed by \0 Consumes server threads eval("... ") \0 Forever Frame Slide 11 Perch real-time e come ? Server-Sent Events Server-Sent Events (SSE) are a standard describing how servers can initiate data transmission towards clients once an initial client connection has been established. They are commonly used to send message updates or continuous data streams to a browser client and designed to enhance native, cross-browser streaming through a JavaScript API called EventSource, through which a client requests a particular URL in order to receive an event stream. Stream Updates with Server-Sent Events Slide 12 Real-time: How to survive ? So many options and a big Headache ! Slide 13 SignalR Persistent Connection Abstraction communication library. Abstracts protocol and transfer (choses the best one). A single programming model (a unified development experience). Extremely simple to use. Server-side it can be hosted in different environments (ASP.NET, console apps, windows services, etc). Client-side theres support for: Javascript clients,.NET clients, WP; provide by the community: iOS, Android. Slide 14 SignalR Works everywhere !!! Try WebSocket then fallback to: Server Sent Events Forever Frame Long Polling Bet to keep the logic connection up include retry logic Scale out to web-farms Slide 15 SignalR Complete rewrite of the internals for 1.0.0 Very hight performance on a single box 100.000s of messages per seconds Very low memory overhead Full async 1000s of connection per server Cross-platform: run it on OSX or Linux with Mono Supported part of ASP.NET family Slide 16 SignalR Persistent Connections: Low level API, manages the connection and the raw stream of data. Hubs: High level API, provide advanced support for internal routing (calling functions on server & clients), connection and disconnection tracking, grouping etc Automatic client proxy generation (JavaScript) Slide 17 SignalR Install-Package Microsoft.AspNet.SignalR Install-Package Microsoft.AspNet.SignalR.Sample Slide 18 SignalR packages Core Microsoft.AspNet.SignalR.Core: Server side components needed to build SignalR endpoints Meta package Microsoft.AspNet.SignalR: - A meta package that brings in everything you need to run it on IIS and ASP.NET Hosts Microsoft.AspNet.SignalR.SystemWeb - Pulls in the required packages to host SignalR in ASP.NET (via OWIN ASP.NET host) Microsoft.AspNet.SignalR.Owin - OWIN* host for SignalR * OWIN* OWIN stands for Open Web Interface for.NET and it is a specification for the communication between.NET Web Server and Web applications. Slide 19 SignalR packages Clients Microsoft.AspNet.SignalR.Js - Javascript client for SignalR Microsoft.AspNet.SignalR.Client -.NET client for SignalR (includes WinRT, Windows Phone 8 and Silverlight5 clients) Scaleout Buses Microsoft.AspNet.SignalR.Redis - Redis scaleout for SignalR Microsoft.AspNet.SignalR.ServiceBus - Service bus scaleout for SignalR Sample Microsoft.AspNet.SignalR.Sample - A sample stock ticker you can quickly and easily bring into your app to get a working sample up and running. Slide 20 Demo Web Plant Monitor PlantHub PlantMonitor PlantManager Plant Device PlantCommand PlantData TcpCommandListener Slide 21 Demo Data Flow Page HUB Device Page SendCommand data command 22000 21000 data updatePlaintData command Slide 22 Q&A Slide 23 Links Getting Started with ASP.NET SignalR ASP.NET SignalR Building Real-time Web Apps with ASP.NET SignalR Engaging the Realtime Web with SignalR SignalR. Code, not toothpaste. Slide 24 feedback 10 Bloghttp://mircovanini.blogspot.comhttp://mircovanini.blogspot.com Emailinfo@proxsoft.itinfo@proxsoft.it Webwww.proxsoft.itwww.proxsoft.it Twitter@MircoVanini@MircoVanini Contatti