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WebSockets allow real-time communication between the Mobile App and the Server. You will learn the principles through a concrete example of a basic real-time multiplayers game.

Difficulty: Intermediate

Forewords

Unless you are building an application that does not need to exchange information with a server, communication between a Mobile Application and a Server is a must.

HTTP Client Server

Communication between a Mobile Application and a Server is usually achieved through the HTTP protocol, where the client (= mobile app) sends a HTTP request to a Server over the Internet. Once the Server has processed the request, it returns the answer back to the client and closes the connection.

This is a one-way direction communication, where the communication must always be initiated by the client and consists in a single exchange (send -> receive -> close). The server has no possibility to send anything to the client without having been asked, by the client, to do so.

Most of the time, this means of communication is enough and even recommended. However, if you need to poll the server very frequently, move high-volume of data, react based on events that could occur at the server-side, this way of communication might become a bottleneck.

WebSockets

Some other types of applications such as chat, real-time games, auctions… may require to:

• have a communication channel that remains open between the client and the server for a longer period than a single request/response scheme
• have a bi-directional data transmission, where the server could send data to the client without having been requested/polled by the client
• support data streaming

WebSockets allow the client-side to open and persist a connection to the server.

A Web socket is a TCP socket connection between the client and the server, over the network, which allows full duplex communication, in other words: data can be transmitted in both directions and at the same time.A TCP socket is an endpoint instance, defined by an IP address and a port.

For a fully detailed documentation on the technical side of the WebSockets, please refer to RFC6455.

WebSockets in Flutter

The web_socket_channel package provides wrappers for WebSocket connections.

To install this package, add the following line to your pubspec.yaml file: Fishing frenzy slot.

To import the package, add the following 2 imports to your .dart files:

How to connect to the Server?

To connect to the Server, you at least need to know:

• its TCP socket address (e.g. 192.168.1.25:1234)
• the name of its web sockets handler (e.g. '/svc/websockets')
• the URL scheme (‘ws://' for plain-text communication or ‘wss://' for an encrypted channel)

Under the hood

This simple line sends a regular HTTP request to the Server, which also contains an 'Upgrade' header to inform the Server that the client wishes to establish a WebSocket connection. This request initiates the 'handshake' process.If the Server supports the WebSocket protocol, it agrees to upgrade and communicates this through an 'Upgrade' header in the response. Once the handshake is complete the initial HTTP connection is replaced by a WebSocket connection that uses the same underlying TCP/IP connection.

The Channel is now open and ready to be used.

Is it safe?

Well, if you only rely on the base protocol 'ws://', it is as safe as the normal 'http://' protocol.

Therefore, it is strongly advised to use the same encryption as for HTTPS (TLS/SSL).

To establish such secured communication, you need:

• a SSL certificate installed on your server
• use 'wss://' rather than ‘ws://'
• point to the SSL port

Extend the security by authenticating the client

As described in a previous article, you could also use the notion of 'tokens', and only allow authenticated clients to connect.

Therefore, you could also pass some extra data to the header during the connection.

The following example illustrates how to pass extra data in the request header.

How to close the communication?

The communication channel may be closed by the client, using the following command:

How to send messages to the server?

How to handle communication from the server?

To be able to accept incoming messages issued by the Server, you need to subscribe (listen) to events from the Stream.

The signature is the following:

where:

• onData: method which is invoked when some data is received from the Server
• onError: method to handle any errors
• onDone: method to implement to handle a communication closure (from the Server, for example)
• cancelOnError: (default false). If set to true, the StreamSubscription is automatically closed at first error event

So, a typical implementation would be:

Let's put all this in practice

Unlike most of the samples you may find on Internet, I am not rewriting the usual Chat application to explain this topic.Instead we are going to build the skeleton of a real-time multiplayers game. Something like a Tic-Tac-Toe game.

The example will consist in:

• A Websockets server, written in NodeJS
• A Mobile App Game where:
  • Users will provide their name to join the Game;
  • The list of all players will be refreshed in real-time;
  • One User will select another player to start a new game;
  • Both players will be simulateneously notified an brought to the Tic-Tac-Toe board game;
  • Players will have the possibility to:
    • Resign;
    • Play and their moves will be directly visible on the other player board.

Disclaimer

This sample is only aimed at illustrating the topic. The game skeleton we are going to write is very basic, not complete and subject to huge amount of improvements, validations…

The High-Level view

At first, we need to describe the game from both client and server sides.

Client-Side

The client-side (the Mobile App itself), will consist in 2 screens. Online casino review.

• Screen 1:

  This screen will allow the user to:

  • Enter a player name and join the game (= action: 'join')
  • See the list of all players who joined the game (= action: 'players_list')
  • Select a player and start a new game (= action: 'new_game')Both players will then be automatically brought to the second screen.

• Screen 2:

  This screen will display:

  • The name of the opponent player
  • A resign button. If the user taps this button, the player resigns the game (= action: 'resign').Both players are then brought back to the Screen 1
  • A Tic-Tac-Toe grid, made up of 9 cells.
  • When a player clicks on a cell of the grid, the player symbol ('X' or 'O') will be displayed on both players' Mobile App

Server-Side

The server-side will only:

• Record the list of all players and give the players with a unique ID
• Broadcast that list to all players when a new player joins
• Record the players of new games
• Convey one player's actions to the other game player

Communication Protocol

In order to have communication between the players and server, we need to define some kind of language. We are calling this 'protocol'.

All messages that will be sent to the server or from the server to the Mobile App will follow this protocol, which consists in:

• an action
• some data

For convenience, I will use the following JSON object (= Map):

The following diagram shows the protocol:

The Server-side: WebSocket server

For this very basic WebSocket server, I opted for an implementation in NodeJS, using the 'WebSocket' package. Android and macbook sync.

Pre-Requisites

In order to have this work, you need:

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• to have NodeJS (version > 6) installed (refer to NodeJS Website for further details on installing NodeJS).
• install the 'websocket' packageuse 'npm install websocket –save' to install the package

The Source Code

The source code is this WebSocket server is very basic. Let's first have a look at it, explanation goes along with the code.

The Client-Side: Mobile App

Now that we have the server, let's consider the Flutter application.

The Websocket Helper

Let's start by implementing the WebSocket Helper class.

https://erafree.mystrikingly.com/blog/new-rtg-casinos-usa-players. This class is a Singleton that handles the communication based on WebSockets.

I implemented it as a Singleton in order to allow its reuse across the whole application without having to care about the connection.The simple fact of importing this .dart file, is enough to use the socket (application-level global variable).

The Game Communication Helper Class

This class is responsible for handling the websockets communication related to the game.This class is also implemented as a Singleton since it will be used by the 2 screens.

Why did I choose to implement a Game Communication Helper on top of the WebSockets Helper?

Simply because, all the logic related to the Game is centralized. Also, because if we would like to extend the game by adding some Chat feature, for example, we would only have to create a specific class which would also rely on the same WebSockets Helper.

Screen 1: Where the user joins and launches a new game

This screen is responsible for:

• Letting the user join the game, providing a name
• Maintaining a real-time list of all the players
• Letting the user start a new game with another player

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Screen 2: the Game Board

This second screen is reponsible for:

• displaying the name of the opponent in the AppBar
• allowing the user to resign, via a ‘Resign' button
• displaying the game, real-time, together with all the moves
• allowing the user to play a move and send the move to the opponent.

The main

Finally, we have the main routine that simply launches the first screen.

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The results

The following video shows 2 mobile devices running this sample application.As you may see, interactions are real-time.

Conclusions

WebSockets are easy to implement and are essential when a Mobile App needs to deal with real-time and full-duplex communication. https://depositgangtreasureislandwjojackpot.peatix.com.

I hope that this article demystified the concept of WebSockets through this practical example, which, once again, is only aimed at demonstrating the communication using WebSockets.

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Stay tuned for new articles and, happy coding.