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I want to know when should I choose this solution.
Is it just for solving cross domain communications on client browser?
Channel Messaging offer two-way and direct communication between browsing contexts. The DOM is not directly exposed with cross-document messaging but at each end there is a port. The data being sent from one port is the input in other and vice-versa. This will be a good article for you. And another article
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I am writing an android app using Java and for the back-end I chose socket.io in node js.
I just want to ask what happens if I socket.io instead of rest-api?
Using socket.io as the main communication system is not a good choice because the communication system is always open.
now imagine 1000 people want a data trough sockets, it will slowdown your server and sometimes cause server crashes.
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I'm creating a real-time, multiplayer browser game using the ws websocket library in Javascript. I've seen multiple posts talking about the reconnection for their websockets. However, I don't understand why reconnecting the websocket is necessary. Are websocket connections inherently unstable and thus close regularly (~5mins)?
So my questions are, what are the main reasons people implement reconnection into their websockets? And what are the causes of the disconnections?
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I'm trying to write a web application which needs to exchange messages with a local Smart Card.
Currently I'm trying to use WebUSB API to connect the Chrome with the smart card reader, but I'm struggling to use the PC/SC specification.
In my researches I found this two topics:
Architectures to access Smart Card from a generic browser? Or: How to bridge the gap from browser to PC/SC stack?
How to send APDU to PCSC reader from web broswer using javascript
Although they deal with the same subject, they have no connection examples.
If anyone has any tips or example of connection I would be grateful.
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I read article about WebRTC. I understood that it creates a common platform for real time communication. Can some one answer me that if WebRTC requires credentials and also is there any time limit to use.
It's not a platform. According to webrtc.org, WebRTC is a free, open project that enables web browsers with Real-Time Communications (RTC) capabilities via simple JavaScript APIs.
If you want to develop it just with browser and your js code. http://www.webrtc.org/ has all the information you may want.
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Is it possible to implement webRTC at server side? ie., I want my browser to connect to a http server(tomcat which runs a java based app to stream a video) using webRTC protocol and get the streem from the server?
I think compiling webRTC api and access it through JNI will help. Any other easy directions to do this?
There is now a server-side implementation of WebRTC in Asterisk that should enable that: https://wiki.asterisk.org/wiki/display/AST/Asterisk+WebRTC+Support
I haven't yet looked into it that much so I can't say for sure that it does what you want.
Take a look at Lynckia's Licode Project. It is however, Node.js serverside.