websocket – Page 3 – Tarik Billa

How to run functions outside websocket loop in python (tornado)

December 26, 2023 by Tarik

You could call a IOLoop.add_timeout(deadline, callback) that calls the callback at specified deadline timeout (one shot, but you can reschedule), or use the tornado.ioloop.PeriodicCallback if you have a more periodic task. See: http://www.tornadoweb.org/en/stable/ioloop.html#tornado.ioloop.IOLoop.add_timeout Update: some example import datetime def test(): print “scheduled event fired” … if __name__ == “__main__”: http_server = tornado.httpserver.HTTPServer(application) http_server.listen(8888) main_loop = … Read more

Best approach to get RTSP streaming into web browser from IP Camera?

December 26, 2023 by Tarik

Here is a blog entry, or tutorial if you will, that achieves something very similar. Their setup slightly different, but this is the summary: use ffmpeg to convert your input into mpeg1video: ffmpeg -i rtsp://whatever -f mpeg1video -b 800k -r 30 http://localhost:8082/yourpassword/640/480/ Install node.js with stream-server.js script from jsmpeg and ws ws WebSocket package. To … Read more

Must websockets have heartbeats?

December 26, 2023 by Tarik

The RFC 6455, the current reference for the WebSocket protocol, defines some control frames to communicate state about the WebSocket: Close: 0x8 Ping: 0x9 Pong: 0xA Ping and Pong are used for heartbeat and allows you to check if the client is still responsive. See the quote below: A Ping frame may serve either as … Read more

How to debug websocket connection error with “Unknown reason”

December 25, 2023 by Tarik

Looks like someone just filed this as a Chromium (v77) bug. See issue tracking it here. Update 1: As noted in the issue tracker and comments below, this should now be fixed in the latest stable release, which is being rolled out now (2019/10/11). Update 2: Despite the bug being marked as fixed/closed in monorail, … Read more

WebSockets authentication

December 25, 2023 by Tarik

If you’re already doing authentication for the non-websocket part of your app, just pass the session cookie along as the first message after connecting and check the cookie as you normally would. WARNING: It’s been pointed out that the following doesn’t work when flashsockets are used: If you’re using socket.io, it’s even easier—the cookies are … Read more

How can I run a WebSocket server on top of GAE?

December 22, 2023 by Tarik

Spring Boot Websockets in Wildfly

December 21, 2023 by Tarik

You need exclude tomcat-embed-websocket <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-websocket</artifactId> </exclusion> </exclusions> </dependency>

Cross-domain connection in Socket.IO

December 20, 2023 by Tarik

Quoting the socket.io FAQ: Does Socket.IO support cross-domain connections? Absolutely, on every browser! As to how it does it: Native WebSockets are cross-domain by design, socket.io serves a flash policy file for cross-domain flash communication, XHR2 can use CORS, and finally you can always use JSONP.

using ngrok with websocket (or socket.io)

December 17, 2023 by Tarik

Yes. If your node app is working off of port 3000 like in your example then just use ngrok to create a reverse proxy to expose 3000 to the world. Websockets will work just fine with it.

How configure reconnecting in socket.io?

December 13, 2023 by Tarik

This is an old question, but for other people like me, who are looking how to configure reconnect in socket.io (1.x) here is a correct syntax: var socket = new io.connect(‘http://localhost:8181’, { ‘reconnection’: true, ‘reconnectionDelay’: 1000, ‘reconnectionDelayMax’ : 5000, ‘reconnectionAttempts’: 5 });