I have a super simple socket.io node server like below
// Socket!
io.on("connection", (socket) => {
console.log("a user connected");
socket.on("msg", (aaa) => {
console.log(aaa);
});
socket.on("fromServer", (_) => print(_));
console.log(socket.handshake.query)
});
And, here is my Flutter code to connect to the server
// Dart client
IO.Socket socket = IO.io(
'http://192.168.219.102:7199',
IO.OptionBuilder()
.setTransports(['polling'])
.disableAutoConnect()
.setQuery({"hee": 'asdf'})
.build());
socket.connect();
socket.onConnect((_) {
print(_);
});
On the network tab, I see two requests
101 HTTP 490ms
101 WS Pending
When I connect to the socket.io server from the other node.js server, I see the console.log of a user connected on the terminal. However, I see nothing from Flutter.
What can I do to receive the socket message on the server and connect the device.
Related
When I try to connect to my nodejs server it is showing me this error-
connect_error: [{"cause":{"detailMessage":"Control frames must be final.","stackTrace":[],"suppressedExceptions":[]},"detailMessage":"websocket error","stackTrace":[],"suppressedExceptions":[]}]
I used flutter_socket_io for socket connection
My flutter code
socketIO = SocketIOManager().createSocketIO(
websocketUrl, '/', socketStatusCallback: (status) {
print("web socket -------------status");
print(status);
if (status.toString() == "connect") {
print("connected to server with websocket------------------------");
// socketIO.sendMessage("socket request", jsonEncode({"id": id}));
}
});
socketIO.init();
socketIO.connect().then((value){
print('socket connect');
});
I would like to avoid using the package web_socket_channel which despite its vote doesn't seem to not be actively maintained (many github issues not answered) and doesn't handle errors.
I simply need to connect from Flutter to my WebSocket API in AWS.
How can i do that with dart:io package ? Or is it possible with socket_io_client ? I see that the connection is with http and not wss.
I have found a way in addition to the usual try - catch to handle error in the channel.sink.listen StreamSubscription object with the web_socket_channel package.
You can do the following according to this answer :
_channel = IOWebSocketChannel.connect(
'ws://yourserver.com:port',
);
///
/// Start listening to new notifications / messages
///
_channel.stream.listen(
(dynamic message) {
debugPrint('message $message');
},
onDone: () {
debugPrint('ws channel closed');
},
onError: (error) {
debugPrint('ws error $error');
},
);
This actually works and there is no need to use SocketIO in my use case of course.
I recommend you to use this multiplatform websocket package https://pub.dev/packages/websocket_universal . There you can even use low-level webSocket interactions.
Complete example:
import 'package:websocket_universal/websocket_universal.dart';
/// Example works with Postman Echo server
void main() async {
/// Postman echo ws server (you can use your own server URI)
/// 'wss://ws.postman-echo.com/raw'
/// For local server it could look like 'ws://127.0.0.1:42627/websocket'
const websocketConnectionUri = 'wss://ws.postman-echo.com/raw';
const textMessageToServer = 'Hello server!';
const connectionOptions = SocketConnectionOptions(
pingIntervalMs: 3000, // send Ping message every 3000 ms
timeoutConnectionMs: 4000, // connection fail timeout after 4000 ms
/// see ping/pong messages in [logEventStream] stream
skipPingMessages: false,
/// Set this attribute to `true` if do not need any ping/pong
/// messages and ping measurement. Default is `false`
pingRestrictionForce: false,
);
/// Example with simple text messages exchanges with server
/// (not recommended for applications)
/// [<String, String>] generic types mean that we receive [String] messages
/// after deserialization and send [String] messages to server.
final IMessageProcessor<String, String> textSocketProcessor =
SocketSimpleTextProcessor();
final textSocketHandler = IWebSocketHandler<String, String>.createClient(
websocketConnectionUri, // Postman echo ws server
textSocketProcessor,
connectionOptions: connectionOptions,
);
// Listening to webSocket status changes
textSocketHandler.socketHandlerStateStream.listen((stateEvent) {
// ignore: avoid_print
print('> status changed to ${stateEvent.status}');
});
// Listening to server responses:
textSocketHandler.incomingMessagesStream.listen((inMsg) {
// ignore: avoid_print
print('> webSocket got text message from server: "$inMsg" '
'[ping: ${textSocketHandler.pingDelayMs}]');
});
// Listening to debug events inside webSocket
textSocketHandler.logEventStream.listen((debugEvent) {
// ignore: avoid_print
print('> debug event: ${debugEvent.socketLogEventType}'
' [ping=${debugEvent.pingMs} ms]. Debug message=${debugEvent.message}');
});
// Listening to outgoing messages:
textSocketHandler.outgoingMessagesStream.listen((inMsg) {
// ignore: avoid_print
print('> webSocket sent text message to server: "$inMsg" '
'[ping: ${textSocketHandler.pingDelayMs}]');
});
// Connecting to server:
final isTextSocketConnected = await textSocketHandler.connect();
if (!isTextSocketConnected) {
// ignore: avoid_print
print('Connection to [$websocketConnectionUri] failed for some reason!');
return;
}
textSocketHandler.sendMessage(textMessageToServer);
await Future<void>.delayed(const Duration(seconds: 30));
// Disconnecting from server:
await textSocketHandler.disconnect('manual disconnect');
// Disposing webSocket:
textSocketHandler.close();
}
Physical devices cannot connect to my web socket. I tried it with 3 different phone and with different networks. It works fine with my simulators though. I am not getting an error message apart from the standard "Cannot connect to the server" from socket.io on the client.
I don't know if this is a valid indicator but I also tried using https://www.websocket.org/ with the following parameter:
wss://converzone.htl-perg.ac.at:5134
I am getting a "ERROR: undefined DISCONNECTED" there.
I am using an ubuntu server which runs Ubuntu 16.04. The web socket is from socket.io and I am coding with Swift on the client and with Node.js on the server. This whole thing is running on my school's server.
// Here is an array of all connections to the server
var connections = {};
io.sockets.on('connection', newConnection);
function newConnection(socket) {
console.log(socket.id + " connected.");
socket.on('add-user', function(user) {
connections[user.id] = {
"socket": socket.id
};
});
socket.on('chat-message', function(message) {
console.log(message);
if (connections[message.receiver]) {
console.log("Send to: " + connections[message.receiver].socket);
//io.sockets.connected[connections[message.receiver].socket].emit("chat-message", message);
io.to(connections[message.receiver].socket).emit('chat-message', message);
} else {
console.log("Send push notification")
sendPushNotificationToIOS(message.senderName, message, message.deviceToken, message.sound)
}
});
//Removing the socket on disconnect
socket.on('disconnect', function() {
console.log("The client disconnected");
console.log("The new list of clients is: " + connections)
for (var id in connections) {
if (connections[id].socket === socket.id) {
delete connections[id];
break;
}
}
})
}
Please understand that this problem seems very weird to me. I have changed the AppTransferProtocol in my plist and changed the port from 3000 to 5134. Nothing changed. Tell me what code would seem relevant apart from the (minimal) server code.
My socket emit works properly only on debug mode, when i tried with release APK nothing happened.
Code to connect socket -
socket = io(SOCKET_URL, {
transports: ['websocket'],// you need to explicitly tell it to use websockets
forceNew: true,
jsonp: false
});
socket.on('connect', () => {
console.log('connected!');
});
socket.on('disconnect', () => {
console.log('disconnect!');
});
Code to emit event
socket.emit('LIVE_MSG', { msg: "asdfasasdf3" }, (res) => {
console.log(res);
})
I have tried many options with socket connection i.e. timeout, setting and removing jsonp
Also tried with window.navigator.userAgent = "react-native";
But the result is none, socket only emits event when it is in debug mode, gone mad why it is not working with release apk.
Please help.
If you don't specify url, socket set url as localhost.
https://socket.io/get-started/chat/
"Notice that I’m not specifying any URL when I call io(), since it defaults to trying to connect to the host that serves the page."
(I'm not familiar with socet.io.)
Then not run in this script. Call function on websocket server running well.
// WAMP server
var wsuri = 'ws://localhost:8080';
// connect
ab.connect(wsuri,
// WAMP session was established
function (session) {
// asynchronous RPC, returns promise object
session.call("hitUp", {
my : 'data'
}).then(function(){
alert('aaaa');
});
}
);
Problem was about websocket server muse be send callResult.
http://wamp.ws/spec/#callresult_message.
If your websocket server dosnt response to client callResult .then callback will not be executed.