cz.blocshop.socketsforcordova

sockets-for-cordova

This Cordova plugin provides JavaScript API, that allows you to communicate with server through TCP protocol.

Currently we support these platforms: iOS, Android, WP8.

Installation

Install this plugin simply by:

cordova plugin add cz.blocshop.socketsforcordova

or you can use GIT repository for most recent version:

cordova plugin add https://github.com/blocshop/sockets-for-cordova

Sample usage

Here is simple example of how to connect to remote server, consume data from it and close the connection.

Create instance of Socket type:

var socket = new Socket();

Set data consumer, error and close handlers:

socket.onData = function(data) {
  // invoked after new batch of data is received (typed array of bytes Uint8Array)
};
socket.onError = function(errorMessage) {
  // invoked after error occurs during connection
};
socket.onClose = function(hasError) {
  // invoked after connection close
};

Connect to server someremoteserver.com, with port 1234:

socket.open(
  "someremoteserver.com",
  1234,
  function() {
    // invoked after successful opening of socket
  },
  function(errorMessage) {
    // invoked after unsuccessful opening of socket
  });

Send "Hello world" to server:

var dataString = "Hello world";
var data = new Uint8Array(dataString.length);
for (var i = 0; i < data.length; i++) {
  data[i] = dataString.charCodeAt(i);
}
socket.write(data);

Close the connection gracefully by sending FIN to server:

socket.shutdownWrite();  

or close the connection immediately:

socket.close();

API

Event handlers

onData: (data: Uint8Array) => void

Invoked after new batch of data is received by the client. Data are represented as typed array of bytes (Uint8Array).

onClose: (hasError: boolean) => void

Invoked after connection close. Native resources are released after this handler is invoked. Parameter hasError indicates whether connection was closed as a result of some error.

onError: (message: string) => void

Invoked when some error occurs during connection.

Properties

state: Socket.State

Provides state of the socket. It can have 4 values represented by Socket.State enum:

• Socket.State.CLOSED
• Socket.State.OPENING
• Socket.State.OPENED
• Socket.State.CLOSING

Initial state of socket is CLOSED. Invoking open method changes state to OPENING. If it's successfuly opened, it goes to OPENED state. If opening fails, it goes back to CLOSED. Socket goes to CLOSING state immediately after close method is called. When socket is closed (by the server or by calling close method), it goes to CLOSED state.

Example

Check if socket is connected:

if (socket.state == Socket.State.OPENED) {
  console.log("Socket is opened");
}

Methods

open(host, port, onSuccess?, onError?): void

Establishes connection with the remote host.

parameter	type	description
host	string	Remote host/ip address
port	number	Tcp port number
onSuccess	() => void	Success callback - called after successfull connection to the remote host. (optional)
onError	(message: string) => void	Error callback - called when some error occurs during connecting to the remote host. (optional)

write(data, onSuccess?, onError?): void

Sends data to remote host.

parameter	type	description
data	Uint8Array	Typed array of bytes, that will be written to output stream.
onSuccess	() => void	Success callback - called after data are successfully written to the output stream. (optional)
onError	(message: string) => void	Error callback - called when some error occurs during writing of data to the output stream. (optional)

shutdownWrite(onSuccess?, onError?): void

Sends FIN to remote host and finishes data sending. You cannot call write method after you call shutdownWrite, otherwise onError callback (of write method) will be called.

parameter	type	description
onSuccess	() => void	Success callback - called after sending of data is finished. (optional)
onError	(message: string) => void	Error callback - called when some error occurs during this procedure. (optional)

close(onSuccess?, onError?): void

Closes the connection. onClose event handler is called when connection is successfuly closed.

parameter	type	description
onSuccess	() => void	Success callback, called after connection is successfully closed. onClose event handler is called before that callback. (optional)
onError	(message: string) => void	Error callback, called when some error occurs during this procedure. (optional)