Cannot connect with a particular device to Azure IoT Hub - azure-iot-hub

If I use a connection string taken from a particular device in our device list, I cannot connect. With other clients, I have no problems. If I take that device's connection string and change a character in the key, the connection, obviously, fails.
It seems that is trying to connect but cannot do that. I know that other developers in the team tried to connect with this client and succeeded. Maybe they left some kind of connection open? Maybe is the connection still open?
Why is this happening?

Previous open connections are not a problem, because a new connection replaces an existing one.
I would double check the connection string, and then try to exclude the possible bugs in the app code, using a tool like Azure CLI

Related

WebRTC make a connection between two different devices

Well I am studying about Web-RTC from its official documentation. I need to integrate live streaming in my website but after seeing this and studying about all its documentation. I only learn about streaming on locally like on same browser and same page. But this is not what i want. I want to start stream from my admin panel(This part has been completed) and broadcast that stream whoever has access to my website whatever the website is and whatever device. Whoever open my website if i m streaming then he should see that and if some of u have worked on live streaming then u should tell me. It will be a great help for me. All i did until now is to make a connection between two peers on same page. Now i want to make global peer to peer connection
I have done this implementation using simple-peer. Basically a wrapper for webRTC.
As soon as a new user connects a new webrtc connection should be made between the receiver and the caller. The receiver is firstly initialized and then sends a message to the sender to start the connection. This first connection is all done by your own server you should write.
Here is a working example. And here is the demo. Any connected devices will be automatically connected to the call. Multiple users supported. You'll find all the webrtc code in /public/js/main.js
You have to do signaling which mean that you have to exchange the PEER CONNECTIONS over the server and which required you to build a server page and client page so both of you can exchange the peer connection.
here is the complete procedure of exchanging the peer connection over the server.
find the heading
RTCPeerConnection plus servers
https://www.html5rocks.com/en/tutorials/webrtc/basics/

EasyRTC multi-connection with different network connection

EasyRTC is a open source webRTC plugin used for many purpose.
My intention is to prepare a video chatting example using this. When I try this with same network connection (same wifi) it works like a charm, but when I try this with different wifi network its not working instead its through errors like
No usable STUN/TURN path -- in client end
undefined -- in initiator end.
Is there is any configuration I need to change to make this working.
Thanks in advance
Mtbikemike has called it.
The general experiment is trying using the demos at demo.easyrtc.com. They are backed by a turn server. If they work across networks and your own doesn't, then it's probably a challenging network that needs a turn server. Turn servers don't punch holes so much as they act as packet relays.
EasyRTC is an open source bundle of a signalling server, a Javascript client and some demonstration code, rather than a plugin. If you've got a firewall between you and the other party then you'll need a TURN server. We do have a TURN server backing the demo.easyrtc.com demos on our servers. We are working on putting together a paid TURN service specifically designed for EasyRTC. Should be available in the next month or so. For now you could look into using a TURN service from Xirsys or put up you own TURN server in the cloud or on your premise but outside the firewall.

What connection settings needs to be used in order to connect chat client to server?

So I am playing around in Visual Basic and I'm making a chat client and server. I already did both and tested it on local machine and works. Server listens to connection and records all activities. This is reflected in chat client.
Here's the line of code that I use in order to connect to the "chat server" on same computer.
Dim clientSocket As New System.Net.Sockets.TcpClient()
clientSocket.Connect("127.0.0.1", 8888)
Anyone know what kind of settings I would need in order to connect remotely to another computer that has the chat server running?
The short answer is that you need to change the IP. But the real question is how do you get the IP?
Now if this is just for fun or something, you could just PING the computer if you know the name or walk over to that computer and run something like IPCONFIG on it.
But, in the real world, with a real chat, when a client launches, you would then grab the IP programmatically and post it along with some other info, like the User Name, to a database or web service (which you also created) so other clients would know it is online. You would also need to remove that record or update it with an offline flag or something as well as handle cases where the client looses network connectivity or ends unexpectedly. You can see where I am going with this...
The point is, this needs to be the IP of the client you want to talk to. 127.0.0.1 always refers to the local computer or device.

How can a server know which client is connecting it while the client is using getInputStream:outputStream:?

I am using hotspot to communicate with iPhone, I publish netservice and connect each other. While every client can find many devices, when one of them connect my device by using getInputStream:outputStream:, how can I know which one is connecting me? PS:I have tried to resolve IP, but IP address can change any time.
Make your hotspot send some defined credentials (such as a host name) on the first attempt to connect. When accepting an input stream, check, if these data are provided and you're all set.

If possible--how to use an irc server (like gmail chat or facebook) to establish ssh connection between two hosts behind firewalls

I have been looking around for a solution that implements this, but google always gives me tutorials on establishing a live chat over an ssh tunnel--not the other way around.
I suspect this can be implemented just using tunnels (if it is possible at all), but I am not sure how.
I am sorry if this has been asked, but after looking through the related questions, but I have not been able to find one that I can be sure will work for my particular needs (i.e. I cannot create an ssh session directly with gmail.com etc.) If I am wrong, please just post a link to the applicable question.
If you can establish connections between peers via your IRC channel, then there is a solution.
Don't try to fiddle with IRC itself, but build a solution on top of it.
Use ssh yourself on top of IRC.
I mean create a SSH/SSL connection to a dummy socket you can use to intercept the data sent by SSH. Transform this data (if necessary) to make it transportable via IRC. And send it to the remote peer via IRC.
On the remote peer, intercept your data, un-transform it before giving it to your ssh/ssl connection listener. And proceed the same way to send response.
If the connection is successful ssh will tell you and your can start pouring your data through this secure 'channel'.
Your data going via IRC will be safe, because ssh is.