Issue in client socket in connecting and receiving server socket data.

[Sridhar Parida]

Hi,

I am running a google map app. which sending map data from server via socket. But issue in receiving data at client end. The code is below; Need urgent help.

_connecSocket() {

    socket = SocketIOManager().createSocketIO(

        'http://localhost:8081', '/data-info',

        socketStatusCallback: _socketStatus);

    socket.init();

    // socket.subscribe("/info/values", _onSocketInfo);

    socket.connect();

  }

  _onSocketInfo(dynamic data) {

    print("Socket info: " + data);

  }

Regards,

Sridhar

[Suzuki Tomohiro]

Can you describe the issue in more detail?

Error message?

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[Sridhar Parida]

Hi Suzuki,

I have shared the Java Server build ( via gmail drive sharing ). the jar file can be run using >java jar socket-map.jar.

The client as below;

The client socket  is not connecting. I need to connect and receive the data from Server.

import 'package:flutter/material.dart';

import 'package:flutter_socket_io/flutter_socket_io.dart';

import 'package:flutter_socket_io/socket_io_manager.dart';

import 'package:web_socket_channel/io.dart';

import 'package:web_socket_channel/status.dart' as status;

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return MaterialApp(

      home: MyHomePage(),

    );

  }

}

class MyHomePage extends StatefulWidget {

  @override

  _MyHomePageState createState() => _MyHomePageState();

}

class _MyHomePageState extends State<MyHomePage> {

  SocketIO socket;

  @override

  void initState() {

    // TODO: implement initState

    super.initState();

  }

  // _connecSocket() async {

  //   var channel = IOWebSocketChannel.connect("http://localhost:8081/data-info");

  //   channel.stream.listen((message) {

  //     channel.sink.add("received!");

  //     channel.sink.close(status.goingAway);

  //   });

  // }

  _connecSocket() {

    socket = SocketIOManager().createSocketIO(

        'http://localhost:8081', '/data-info',        

        socketStatusCallback: _socketStatus);

    socket.init();

     socket.subscribe("/info/values", _onSocketInfo);

    socket.connect();

  }

  _onSocketInfo(dynamic data) {

    print("Socket info: " + data);

  }

  _socketStatus(dynamic data) {

    print("Socket status: " + data);

  }

  @override

  Widget build(BuildContext context) {

    return Scaffold(

      body: Center(

        child: RaisedButton(

          child: Text('Hello'),

          onPressed: () {

            _connecSocket();

            print('working');

          },

        ),

      ),

    );

  }

}

Regards,

Sridhar

[Suzuki Tomohiro]

I don’t see any error message. Which line of the log is unexpected to you?

On Wed, Aug 5, 2020 at 08:03 Sridhar Parida <spa...@asiczen.com> wrote:

Hi Suzuki San,

Shared the client file having issue.

The log file as below;

================

Launching lib\main.dart on SM G610F in debug mode...
√ Built build\app\outputs\apk\debug\app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:57407/gOwiHWrJT8w=/ws
D/libGLESv2(10014): STS_GLApi : DTS, ODTC are not allowed for Package : com.example.socket_project
D/ViewRootImpl@6e4f022[MainActivity](10014): ViewPostIme pointer 0
D/ViewRootImpl@6e4f022[MainActivity](10014): ViewPostIme pointer 1
I/flutter (10014): CREATING NEW SOCKET: http://localhost:8081/data-info
I/flutter (10014): Created+++++++++++
I/flutter (10014): working
D/FlutterSocketIoPlugin: FlutterSocketIoPlugin(10014): onMethodCall: socketInit - domain: http://localhost:8081 - with namespace: /data-info
D/FlutterSocketIoPlugin: TOTAL SOCKETS: (10014): 0
D/FlutterSocketIoPlugin: TOTAL SOCKETS: (10014): 0
D/FlutterSocketIoPlugin: added SocketIO(10014): http://localhost:8081/data-info
D/FlutterSocketIoPlugin: SocketIO(10014): connecting...null
D/ViewRootImpl@6e4f022[MainActivity](10014): ViewPostIme pointer 0
D/ViewRootImpl@6e4f022[MainActivity](10014): ViewPostIme pointer 1
I/zygote  (10014): Do partial code cache collection, code=22KB, data=30KB
I/zygote  (10014): After code cache collection, code=22KB, data=30KB
I/zygote  (10014): Increasing code cache capacity to 128KB
I/flutter (10014): Created+++++++++++
I/flutter (10014): working
D/FlutterSocketIoPlugin: FlutterSocketIoPlugin(10014): onMethodCall: socketInit - domain: http://localhost:8081 - with namespace: /data-info
D/FlutterSocketIoPlugin: TOTAL SOCKETS: (10014): 1
D/FlutterSocketIoPlugin: SocketIOManager(10014): socket: http://localhost:8081/data-info already existed!

================

Regards,

Sridhar.

On Wed, Aug 5, 2020 at 10:11 AM Sridhar Parida <spa...@asiczen.com> wrote:

Hi Suzuki San,

Shared the server ( .jar ) link.

https://drive.google.com/drive/folders/1AJQHdZtCiwZE828GlK2ffMxVulKRivZe 

Regards,

Sridhar.

 

[Suzuki Tomohiro]

(Last question)

I don’t see any error message. Which line of the log is unexpected to you?

On Wed, Aug 5, 2020 at 09:55 Sridhar Parida <spa...@asiczen.com> wrote:

Launching lib\main.dart on SM G610F in debug mode...
√ Built build\app\outputs\apk\debug\app-debug.apk.

Connecting to VM Service at ws://127.0.0.1:59598/mtWv_zPlLJ8=/ws
D/libGLESv2(12134): STS_GLApi : DTS, ODTC are not allowed for Package : com.example.socket_project
D/ViewRootImpl@6e4f022[MainActivity](12134): ViewPostIme pointer 0
D/ViewRootImpl@6e4f022[MainActivity](12134): ViewPostIme pointer 1
I/flutter (12134): CREATING NEW SOCKET: localhost:8081/data-info
I/flutter (12134): Created+++++++++++
I/flutter (12134): working
D/FlutterSocketIoPlugin: FlutterSocketIoPlugin(12134): onMethodCall: socketInit - domain: localhost:8081 - with namespace: /data-info
D/FlutterSocketIoPlugin: TOTAL SOCKETS: (12134): 0
D/FlutterSocketIoPlugin: TOTAL SOCKETS: (12134): 0
D/FlutterSocketIoPlugin: added SocketIO(12134): localhost:8081/data-info
D/FlutterSocketIoPlugin: SocketIO(12134): connecting...null
D/ViewRootImpl@6e4f022[MainActivity](12134): ViewPostIme pointer 0
D/ViewRootImpl@6e4f022[MainActivity](12134): ViewPostIme pointer 1
D/ViewRootImpl@6e4f022[MainActivity](12134): ViewPostIme pointer 0
D/ViewRootImpl@6e4f022[MainActivity](12134): ViewPostIme pointer 1
I/flutter (12134): Created+++++++++++
I/flutter (12134): working
D/FlutterSocketIoPlugin: FlutterSocketIoPlugin(12134): onMethodCall: socketInit - domain: localhost:8081 - with namespace: /data-info
D/FlutterSocketIoPlugin: TOTAL SOCKETS: (12134): 1
D/FlutterSocketIoPlugin: SocketIOManager(12134): socket: localhost:8081/data-info already existed!
I/zygote  (12134): Do partial code cache collection, code=26KB, data=30KB
I/zygote  (12134): After code cache collection, code=26KB, data=30KB
I/zygote  (12134): Increasing code cache capacity to 128KB
V/InputMethodManager(12134): Starting input: tba=android.view.inputmethod.EditorInfo@65e6234 nm : com.example.socket_project ic=null
D/InputMethodManager(12134): startInputInner - Id : 0
I/InputMethodManager(12134): startInputInner - mService.startInputOrWindowGainedFocus
D/InputTransport(12134): Input channel constructed: fd=91
D/InputTransport(12134): Input channel destroyed: fd=86
D/SurfaceView(12134): windowStopped(true) false 9bb0870 of ViewRootImpl@6e4f022[MainActivity]
D/SurfaceView(12134): BG show() Surface(name=Background for - SurfaceView - com.example.socket_project/com.example.socket_project.MainActivity@9bb0870@0) io.flutter.embedding.android.FlutterSurfaceView{9bb0870 V.E...... ........ 0,0-1080,1920}
D/SurfaceView(12134): surfaceDestroyed 1 #1 io.flutter.embedding.android.FlutterSurfaceView{9bb0870 V.E...... ........ 0,0-1080,1920}

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[Suzuki Tomohiro]

Good. Further questions:

Where is “Created+++++++++++” in the log coming from? Is that your code?

How do you know socket.init() is not processed?

On Thu, Aug 6, 2020 at 00:52 Sridhar Parida <spa...@asiczen.com> wrote:

After socket is created, 

1. the control is not proceeding for socket.init() and socket.connect().

2. Even though subscribe for the data ( 2 Vehicle no. and Geo coordinates from server ) not able to receive at client side (  there may be some error in "main.dart" file and I am unable to identify.

Regards,

Sridhar

[Sridhar Parida]

Below is my Code. The print after socket create; socket.init and socket.connect not printed. Also the socket data not printed.

=========================================

class _MyHomePageState extends State<MyHomePage> {
  SocketIO socket;
 
  @override
  void initState() {

    super.initState();
  }

  _connecSocket() async {

    socket = SocketIOManager().createSocketIO('http://localhost:8081', '/data-info', socketStatusCallback: _socketStatus);

    print('Created+++++++++++');  
    await socket.init();
    print('Initialized++++++++++++');
    await socket.connect();
    await Future.delayed(Duration(seconds: 15));
    print('Connected+++++++=');

if (socket != null)
{
 socket.subscribe('/info/values', (data) async {
 print("Status+++++++++++++++++ "+ data.body);
});
}
else
{
  print('Socket not Connected');
}

}

=====================

Regards,

Sridhar

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[Suzuki Tomohiro]

Any chance that socket.init() is throwing an exception? Use try-catch clause to confirm this.