Can anyone explain me the possibilities of creating a web chat (i.e similar to whatsappweb) which works without internet connections the only possible way that these device communicate is either by WiFi or Bluetooth (i.e Peer to peer). If it is not possible on earth could then explain why?
I've come across some javascript files like peer.js. But it uses internet i think. I want it to work without internet connectivity.
Thanks in advance.
With WebRTC it is possible to establish peer-to-peer communication between web-browsers in the same local network: https://developer.mozilla.org/en-US/docs/Web/Guide/API/WebRTC/Peer-to-peer_communications_with_WebRTC
A server is only needed for communication outside of a local network: http://blog.vline.com/post/63765098884/webrtc-if-its-p2p-why-do-i-need-a-server
There is another demonstration in this page: https://hacks.mozilla.org/2013/05/embedding-webrtc-video-chat-right-into-your-website/
However WebRTC is a relatively new system that is not widely supported - so consider it experimental at this stage - but it has the backing of Mozilla, so it might end-up somewhere.
However you are limited to the capabilities that WebRTC provides - and as your code is still JavaScript that runs in the browser you will not have access to any kind of actual networking API (such as Berkeley Sockets) or lower-level control of hardware, such as the ability to create Ad-hoc Wi-Fi networks, new Bluetooth Personal Area Networks, or LE Bluetooth connections... at present.
Google is working on making a Bluetooth API available that runs in the browser. Presently it is only available to Chrome Extensions, but it may soon be available in web-pages in general: https://developers.google.com/web/updates/2015/07/interact-with-ble-devices-on-the-web
Ofcourse there is a way to make this happen. You would have to set up a webserver on the device with this webapp. You could then connect with localhost or 127.0.0.1 . Other people would have to join your hotspot and connect to your ip address.
If you want to connect automaticly you would have to write a real app.
Browsers run in a "contained" mode. No hardware access is possible from any script ran inside the browser, thus there's no way to initialize and setup the device to start direct communication.
Related
I have connect multiple android devices to the same WiFi network but internet connection is not working. I want to sync data between all devices. Is there anyway to do the data synchronization on local network without internet ? in short I want to sync data between devices using local network.
Sure! It's not trivial though.
If you're looking to do this without using a "static" server or database or similar on the local network,
you'll need a way for the devices to be able to discover each other (the easiest is manually, i.e. by entering an IP address)
listen to network requests – on one device if you're looking for a star/server-client topology, or on all of them if you're looking for a mesh where all devices sync with all of them
have the devices talk to each other to sync data as required.
Are there any built-in methods in Electron / Node.js allowing to transfer a file over local network to another device?
I want to be able to send files locally from one computer to another (through an Electron app), but I also want it to be able to send files to smartphones.
How do I do it? Is it possible to just create a temp local server and download the file from another device by opening the URL (e.g. 192.168.0.x:x/file.txt)?
I tried using https://www.npmjs.com/package/quick-transfer which does exactly that, but for some reason opening the link on another device doesn't do anything.
As painful as it is for me to suggest... I'd recommend WebRTC for this, for these reasons:
It will make a local connection, when possible.
It will work over the internet as well, if required.
You can work around any firewall difficulties with TURN.
You will have compatibility with browsers.
You won't be opening up some server to a file that anyone on the network can get... transmission occurs over a secured connection. (This doesn't mean you can ignore other security aspects in your application however!)
Sample code: https://webrtc.github.io/samples/src/content/datachannel/filetransfer/
Commentary: It's amusing to me that in 2018, we still haven't solved the problem of sending a file from point A to point B. Network Neighborhood in Windows was the golden age, and now it's all screwed up with this newfangled cloud crap. :-) Obligatory: https://xkcd.com/949/
In the Substratum Initial Coin Offering (ICO), the White Paper talks about solving problems of the current Internet, by allowing hosts to become web hosts.
Based on reading of the White Paper, the team looks like they're intending to write Javascript that runs on any modern browser (IE, Safari, Chrome, Firefox) on any platform (Windows, Linux, etc) to turn it into a web server.
As the White Paper is very general, I'm not sure if the team's Javascript is also having some form of access to uPnP technology that tells the nearest router to forward port 80 into the (supposed) web browser that's running on the web server.
Does anyone familiar with current web browsers know if browsers are capable of:
Providing access to uPnP that can tell routers to do port forwarding?
Running a web server using Javascript?
Thank you. (I'm familiar with general programming, just not capabilities of current web browsers. Please limit responses to capabilities of web browsers)
There are some JavaScript libraries such as nohost that use Service Workers to mimic a file server on the client-side. This is apparently possible because service workers are able to send custom responses to HTTP requests.
It might also be possible to run a server in a browser in an x86 emulator in JavaScript, though I don't know if this has been done yet.
We are working on an IP camera Android app that should stream the video took in real-time by the Android camera to a Web page served by the same app and accessed through WiFi only.
The app currently use a pseudo-streaming method (an image sent using HTTP with no-store), but it is not robust enough, so we need to change it for a better streaming method. We also need to support multicast (or at least an optimized "multi-unicast"), and if possible use an UDP protocol (or at least a low-latency TCP protocol).
We cannot use any intermediary server (so no Wowza or the like, unless it is also served by the app) or any browser plugin (so no VLC or the like, unless it is served by the app too). The main browser it is used on is Chromium.
We searched for and tried a lot of methods but none worked for us :
WebRTC sounds cool, but it uses an intermediary signaling server, it doesn't support multicast, and it is kind of heavy for what we want
RTSP with libstreaming sounds cool too, but no browser seems to implement it, and we couldn't find a Javascript library to do it.
RTMP works on most browsers, but we could'nt find a working Android library
Which streaming method would be best for our needs, and do you know Javascript and Android libraries implementing them ?
There is no way to stream multicast to a browser.
I've developed interactive content for a client ( VR Objects ) using javascript and Flash (if needed) that they now want to distribute to prospective customers via a flash drive. That makes it local content causing security issues especially with IE. Actually there doesn't seem to be much problem with any browser except IE. True, IE displays the "allow blocked content" button but they fear that is too complicated or scary. And on IE11 in Win 8.1 it still may not work.
The development environment I use has a way around that for testing using an "embedded web server" although all that seems to do is produce a localhost address such as http://localhost:60331/wyj-01xn/output/surfacide_flash.html. Paste that in the URL bar of any browser on the same machine and you are good. Try it on another machine and no go. So I gather the port address and whatever the /wyj-01xn/ is about are machine specific. Another possible problem -- it may not work easily with IE11 on Win8.1, but I don't personally have that setup to test.
QUESTION: Is there a way I can produce this same functionality for my client, distributed along with the content on the flash drive, without the need to install some special software (local web server) on each client computer??? The current workaround is to tell customers they should us any browser except IE. Client isn't happy.
You could distribute your webpages along with a portable Nginx server, or wrapped inside a Node-webkit or AppJS package.