how to use dart WebSocket on Flutter

[Niyazi Toros]

Hi,

Below is dart websocket class info. Its look perfect. My question is how to use dart WebSocket on Flutter?

What step should I take?

https://api.dartlang.org/stable/1.24.3/dart-html/WebSocket-class.html

// To use a WebSocket in your web app, first create a WebSocket object, 

// passing the WebSocket URL as an argument to the constructor.

var webSocket = new WebSocket('ws://127.0.0.1:1337/ws');

// To send data on the WebSocket, use the send method.

if (webSocket != null && webSocket.readyState == WebSocket.OPEN) {

  webSocket.send(data);

} else {

  print('WebSocket not connected, message $data not sent');

}

// To receive data on the WebSocket, register a listener for message events.

webSocket.onMessage.listen((MessageEvent e) {

  receivedData(e.data);

});

[Maik Mewes]

This is the official sample and at least works for older android versions and in the emulator for ios and android:

https://flutter.io/cookbook/networking/web-sockets/

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[Niyazi Toros]

Thanks Main, the link is misleading or at least its documentation is not completed.

Below is my telnet connection. I can send data as  Q101:_:49785:_:************* and receive as  1:_:2:_:119351:_:NİYAZİ TOROS

Problem is that when I use channel: IOWebSocketChannel.connect('ws://echo.websocket.org'), I can connect to server, I can send the data and everything's halt there. It doesn't return anything. I try not use SreamBuilder and try to follow dart example and failed.

After I connect to server I will send my request based on server socket format and receive some data.

Any help on this please?

 Last login: Tue Jun 26 15:01:44 on ttys000

Niyazis-MBP:~ niyazitoros$ telnet

telnet> telnet 192.168.1.22 1024

Trying 192.168.1.22...

Connected to 192.168.1.22.

Escape character is '^]'.

Q101:_:49785:_:*************

1:_:2:_:119351:_:NİYAZİ TOROS

[Niyazi Toros]

I try to test and find where is the error coming from. And I found that data that I send to socket is not correct:

Q: 28.06.2018 08:53:57->GET / HTTP/1.1.      (the correct send data will be: Q101::49785::ABCDE)
A: 28.06.2018 08:53:57 ->:1::1::FAIL1

So how can I emit GET / HTTP/1.1. not to send to socket?