I am working on webrtc Peer to Peer Calling and successfully running the AppRTCDemo available on WEBRTC site . I have gone through the code and stuck on few points :
1 : When I enter the URL it hit the server and I got response like :
response return from server{"meta_viewport":"","pc_constraints":"{\"optional\": [{\"googImprovedWifiBwe\": true}]}","opusfec":"true","include_vr_js":"","vsbr":"","audio_receive_codec":"opus\/48000","arbr":"","vrbr":"","vsibr":"","token":"AHRlWroqCeuFFBWs4dLJRahxtwho2ldeH_94M_ZipRkK7aIH3nAiSFfScjb_Opz2LwC9xVeWeQrJkRWQAeTsK5sxdJEPoC3jP8uQXkE23QnSANqoBwsHOM4","initiator":1,"ssr":"","room_key":"95505311","pc_config":"{\"iceServers\": [{\"urls\": \"stun:stun.l.google.com:19302\"}]}","stereo":"false","audio_send_codec":"","turn_url":"https:\/\/computeengineondemand.appspot.com\/turn?username=77294535&key=4080218913","me":"77294535","room_link":"https:\/\/apprtc.appspot.com\/?r=95505311&t=json","error_messages":[],"offer_constraints":"{\"optional\": [], \"mandatory\": {}}","asbr":"","media_constraints":"{\"audio\": true, \"video\": true}"}
Here , I just want to know where exactly they are creating iceServer ? On their Server or is there any code inside their channel.html file.
Is there any way to generate iceServer on application without server ? or IceServer is our stun/turn URL sent from server ?
I also have few question on Channel.html :
how exactly channel.html file helping this demo to run ? I have gone through this also and it is calling the onOpen() and which is calling the GAECLIENT class method .
Thanks,
Whichever ice server is going to be used is passed through to the RTCPeerConnection constructor when it is constructed(the object is called pc for the apprtc example). You can see the servers specifically by looking at the pcConfig object.
Once the connection is created(it is not done until a call starts in this example), the localDescription(a RTCSessionDescription object) is set. Once it is set, the WebRTC api will start automatically gathering IceCandidates against the ice servers first introduced when the peer connection was created. Once a new candidate is created, the onicecandidate event is fired(you can see the function used to transfer the candidates if you look at that callback after the pc object is created).
So the general steps are as follows:
Set what iceServers you want to gather candidates against when you create your RTCPPeerConnection object
Set your localDescription to your local RTCSessionDescription object you create(usually created via the success callback you set in the createOffer or createAnswer functions from the peerconnection).
It will start gathering candidates automatically against the servers you set when the peerconnection was constructed and with each candidate the onicecandidate event is fired.
Now, specifically for the apprtc demo page, it uses an open stun server stun:stun.l.google.com:19302 and an array of closed turn servers(that are hosted on Google's cloud) with dynamic credentials that are gathered at page load.
Related
Using Geode 1.2 and 9.1 Pivotal native client the following code:
IRegion<string, IPdxInstance> r = cache.GetRegion<string, IPdxInstance>("myRegion");
return r[key];
then triggers an AfterCreate event for myRegion. Why does that happen when no data is created, only read?
Same here, never used Native Client. I agreed with what #Urizen suspected - you are calling r[key] from an instance of Geode that doesn't have the entry, so it pulls the data from other instance, which "create" the entry locally.
You have a few options here:
Performing an interest registration for the instance you are initiating the call using registerAllKeys() (doc here). There is a catch here: (might not be applicable for native client), in Java API, you have an option to register interest with an InterestResultPolicy. If you use KEYS_VALUES, you will load all data to local from remote on startup WITHOUT triggering afterCreate callback. If you choose KEYS only or NONE, you will likely have similar problem.
You can check for boolean flag remoteOrigin in EntryEvent. If it is false, it is purely local. In a non-WAN setup, this should be enough to distinguish your local operation from remotely initiated operation (be it a cache syncing or a genuine creation initiated by other cache). Vaguely remembering WAN works a bit different here.
I've never used the Native Client but, at a first glance, it should be expected for the afterCreate event to be invoked on the client side as the entry is actually being created on the local cache. What I mean is that the entry might exists on the server but, internally, the client needs to retrieve it from the server, and then create it locally (thus invoking the afterCreate for the locally installed CacheListener). Makes sense?.
I'm trying to learn how to use webRTC in applications so I wrote a code sample available in the following link: http://wklej.org/hash/fd599a32e8e/
At the beginning I need to say that I don't care about browsers compatibility, All I need is to support Chromium web engine without any external adapters/other libraries.
The web application should allow me to establish a connection between two browser tabs running on the same host — by manually exchange of appropriate data (SDP and ICE candidates).
Steps to follow:
Click on "create offer button", copy local SDP;
Go to other tab and insert previously copied SDP into "remote SDP" area, then press "create answer";
Copy generated local SDP, go to first tab, insert into "remote SDP" area and click on "set remote sdp" button (not create answer button);
Exchange ice candidates — copy them from one tab, insert to the second one and press "addCandidates" button. Do the same in the other way.
The main problem is that this function:
peer.iceconnectionstatechange = function(event) {
console.log("ice connection state: " + peer.iceConnectionState)
}
won't be triggered. I tried to play with STUN/TURN servers without success. The remote video won't run. If somebody could point out where I made mistake?
Try mine (cut'n'paste): https://jsfiddle.net/7vv2vxtt/
Or automatic (localStorage): https://jsfiddle.net/2v1Lnpmx/
This code intentionally left blank.
ICE candidates get added to the local offer/answer over time, so it simply waits for end-of-candidates before producing SDP with all candidates embedded.
Should work in all browsers.
I have a very frustrating problem with a client's network environment, and I'm hoping someone can lend a hand in helping me figure this out...
They have an app that for now is written entirely inside of VBA for Excel. (No laughing.)
Part of my helping them improve their product and user experience involved converting their UI from VBA form elements to a single WebBrowser element that houses a rich web app which communicates between Excel and their servers. It does this primarily via a socket.io server/connection.
When the user logs in, a connection is made to a room on the socket server.
Initial "owner" called:
socket.on('create', function (roomName, userName) {
socket.username = userName;
socket.join(roomName);
});
Followup "participant" called:
socket.on('adduser', function (userName, roomName){
socket.username = userName;
socket.join(roomName);
servletparam = roomName;
var request = require('request');
request(bserURL + servletparam, function (error, response, body) {
io.sockets.to(roomName).emit('messages', body);
});
servletparam = roomName + '|' + userName;
request( baseURL + servletparam, function (error, response, body) {
io.sockets.to(roomName).emit('participantList', body);
});
});
This all worked beautifully well until we got to the point where their VBA code would lock everything up causing the socket connection to get lost. When the client surfaces form it's forced VBA induced pause (that lasts anywhere from 20 seconds to 3 minutes), I try to join the room again by passing an onclick to an HTML element that triggers a script to rejoin. Oddly, that doesn't work. However if I wait a few seconds and click the object by hand, it does rejoin the room. Yes, the click is getting received from the Excel file... we see the message to the socket server, but it doesn't allow that call to rejoin the room.
Here's what makes this really hard to debug. There's no ability to see a console in VBA's WebBrowser object, so I use weinre as a remote debugger, but a) it seems to not output logs and errors to the console unless I'm triggering them to happen in the console, and b) it loses its connection when socket.io does, and I'm dead in the water.
Now, for completeness, if I remove the .join() calls and the .to() calls, it all works like we'd expect it to minus all messages being written into a big non-private room. So it's an issue with rejoining rooms.
As a long-time user of StackOverflow, I know that a long question with very little code is frowned upon, but there is absolutely nothing special about this setup (which is likely part of the problem). It's just simple emits and broadcasts (from the client). I'm happy to fill anything in based on followup questions.
To anyone that might run across this in the future...
The answer is to manage your room reconnection on the server side of things. If your client can't make reliable connections, or is getting disconnected a lot, the trick it to keep track of the rooms on the server side and join them when they do a connect.
The other piece of this that was a stumper was that the chat server and the web UI weren't on the same domain, so I couldn't share cookies to know who was connecting. In their case there wasn't a need to have them hosted in two different places, so I merged them, had Express serve the UI, and then when the client surfaced after a forced disconnect, I'd look at their user ID cookie, match them to the rooms they were in that I kept track of on the server, and rejoined them.
I am facing to a trouble with 2 adapters based authentication. My app is agenda (hybrid app). All adapter's functions must be protected by security.
my app uses adapters based authentication, like written in samples on DeveloperWorks.
My first adapter (loginAdapter) is dedicated for login (beginning of the mobile app). I developed a handler (handlerLogin, mobile side) with methods isCustomResponse, handlechallenge, etc.. This adapter works.
This adapter allows to get a userId from login and password.
As soon as connected, the user can download his agenda. The mobile calls an other adapter based auth (calendarAdapter). I have an other handler (handlerCalendar) with methods (isCustomResponse, handlechallenge).
When the mobile calls the method getCalendarData (protected method, CalendarAdapter), the server detects that the user is not registered for this adapter, that is why the server send an error (structure authrequired + errorMessage) via the function onAuthRequired.
At this step, all works fine.
Actually, the trouble comes from, that, the first handler (handlerLogin) catches this error, whereas it schould be the second handler (handlerCalendar).
Given that it is catched by the handlerLogin, isCustomResponse and handlechallenge are called, and I do not have the expected result ! I do not know why.
Why it is not catched by the handlerCalendar ?
I verified my code, variable's names, files, etc.. All things are ok.
For informations, I first declared the handlerLogin before the CalendarLogin.
Do you have any ideas, suggestions ??
Thank you in advance
It looks like you used the same realm.
The isCustomResponse function job is to find out if this challenge-handler should take care of this specific request. If you use the same realm for both adapters then the 2 challenge-handlers will react to it.
I do asynchronous requests in LoadState method of a certain Page. I use HttpClient to make a request and I expect the splashscreen to go away while I await the result.
If I am not connected to any networks, the splashscreen immediately goes away and I get a blank page because the request obviously didn't happen.
But if I am connected to a network but have connectivity issues (for example, I set a wrong IP address) it seems to start a request and just block.
My expectation was that the HttpClient would realize that it cannot send a request and either throw an exception or just return something.
I managed to solve the issue of blocking by setting a timeout of around 800 milliseconds, but now it doesn't work properly when the Internet connection is ok. Is this the best solution, should I be setting the timeout at all? What is the timeout that's appropriate which would enable me to differentiate between an indefinitely blocking call and a proper call that's just on a slower network?
I could perhaps check for Internet connectivity before each request, but that sounds like an unpredictable solution...
EDIT: Now, it's really interesting. I have tried again, and it blocks at this point:
var rd = await httpClient.SendAsync(requestMsg);
If I use Task.Run() as suggested in the comments and get a new Thread, then it's always fine.
BUT it's also fine without Task.Run() if there is no Internet access but the network access is not "Limited" (it says that the IPv4 connectivity is "Internet access" although I cannot open a single website in a browser and no data is returned from the web service. It just throws System.Net.Http.HttpRequestException which was something I was expecting in the first place) Only blocks when the network connection is Limited.
What if instead of setting a timeout, you checked the connection status using
public static bool IsConnected
{
get
{
return NetworkInformation.GetInternetConnectionProfile() != null;
}
}
This way if IsConnected, then you make the call; otherwise, ignore it.
I'm not sure if you are running this in App.xaml.cs? I've found requests made in that class can be fickle and it may be best to move the functionality to an extended splash screen to ensure the application makes it all the way through the activation process.
http://msdn.microsoft.com/en-us/library/windows/apps/xaml/Hh868191(v=win.10).aspx