Cannot communicate with websocket. Autobahn: received HELLO message, and session is not yet established

Cannot communicate with websocket. Autobahn: received HELLO message, and session is not yet established

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Cannot communicate with websocket. Autobahn: received HELLO message, and session is not yet established
Tag : javascript , By : Michael Gunderson
Date : November 23 2020, 01:01 AM

wish help you to fix your issue Your TestAppWs and your browser code are both WAMP application components. Both of these need to connect to a WAMP router. Then they can talk freely to each other (as if there were no router in between .. transparently).
Here is how to run.
pip install crossbar
cd $HOME
mkdir mynode
cd mynode
crossbar init
crossbar start
import asyncio
from autobahn.asyncio.wamp import ApplicationSession

class MyComponent(ApplicationSession):

   def onJoin(self, details):
      print("session ready")

      counter = 0
      while True:
         self.publish('com.myapp.topic1', counter)
         counter += 1
         yield from asyncio.sleep(1)

if __name__ == '__main__':
   from autobahn.asyncio.wamp import ApplicationRunner

   runner = ApplicationRunner(url = "ws://localhost:8080/ws", realm = "realm1")
var connection = new autobahn.Connection({
   url: 'ws://localhost:8080/ws',
   realm: 'realm1'}

connection.onopen = function (session) {    
   var received = 0;

   function onevent1(args) {
      console.log("Got event:", args[0]);
      received += 1;
      if (received > 5) {
         console.log("Closing ..");

   session.subscribe('com.myapp.topic1', onevent1);


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Android - Autobahn Websocket sending message error(NullPointerException)

Tag : android , By : Epora75
Date : March 29 2020, 07:55 AM
like below fixes the issue I am working on websocket communication with Autobahn. On the main.class of my app, I set to call 'connect()' when users click a button.
public class WebSocket_Connector {

private static final String TAG = "ECHOCLIENT";
public final WebSocketConnection mConnection = new WebSocketConnection();
private String tmpString = "";
public void connect(final String wsuri) {

      Log.d(TAG, "Connecting to: " + wsuri); 

      try {
         mConnection.connect(wsuri, new WebSocketHandler() {

            public void onOpen() {
               Log.d(TAG, "Status: Connected to " + wsuri ); 
               Log.d(TAG, "Connection successful!\n");
               tmpString = "";

            public void onTextMessage(String payload) {
               Log.d(TAG, "Got echo: " + payload);

            public void onClose(int code, String reason) {
               Log.d(TAG, "Connection closed.");
      } catch (WebSocketException e) {

         Log.d(TAG, e.toString());

 public void sendMessage(String message) {

    if (mConnection.isConnected()) 
    else {
       tmpString = message;



How to set websocket session parmateters using autobahn in python

Tag : python , By : user133834
Date : March 29 2020, 07:55 AM
To fix the issue you can do Sorry it was a silly mistake apt-get installed an old version of autobahn . I have installed the binary provided by autobahn site and problem solved :)

How to set specific Sec-WebSocket-Key in Client's WebSocket opening handshake message using autobahn android library?

Tag : android , By : scotta01
Date : March 29 2020, 07:55 AM
will help you The WebSocket spec (RFC6455) requires a compliant client to generate a random key on each and every connection.
A server that mandates a specific key isn't spec compliant. There are no hooks in AutobahnAndroid to set a specific key (and we won't add such things). Please fix your server or use a compliant one.

Terminate previous autobahn websocket call when a new message arrives

Tag : python , By : algoRhythm99
Date : March 29 2020, 07:55 AM
around this issue I think you need some kind of context object that represents your user session (or search session). In that context you can put a latestSearchId which you increment every search. Then you could add the searchId parameter to main_search. And supposing you have a loop or some kind of different stages in which you can abort, you could test whether the searchId in your current search is still the latest by comparing it to the search sessions' latestSearchId.
A different approach (for example if you can't abort your searches) could be to wait a few milliseconds before you compute the search and check whether any new searches have come in, in the mean time.
def resume_search(position):

reactor.callLater(0, resume_search, current_position)

Sending headers/body after the websocket session is established

Tag : session , By : PsyberMonkey
Date : March 29 2020, 07:55 AM
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