I'm working on a project 'Instant Messaging' which works totally on UDP. I would like if there is any good tutorial regarding this. Also can anyone explain how does the client inform the server that it is up without using another port.
Just take any tutorial on socket programming for your favourite language. Informing the server the client is up can be achieved by a simple Hello message.
Related
Ok so I want to have a pressable Button. And whenever someone presses it (on their computer in another network) I want my game to react to it.
It should work like this website:
https://buzzin.live/
People should be able to log in with a username and press a button. I tried searching how to do smt like this but I haven‘t found an answer.
Networking is a really weird topic with very few tutorials (and most of the tutorials are about online fps‘) so I hope to get help here :)
I see two options
Unity's client server networking seems a bit intense for a simple event implementation.
What I would do if I were you is look into WebSocket servers (more than pure tcp servers since usually websocket libraries are easier to use than pure tcp)
Either that or you could look into Unity messaging API which doesn't require to support the whole multiplayer shebang, just simple message passing. I would do some research into Unity's Network Messages and look around.
https://docs.unity3d.com/Manual/UNetMessages.html
Setting up a simple client-server project is pretty straight forward and Unity manages the connection for you.
I'm trying to figure out the communication between an iOS app, and an online server. To my knowledge, a REST service is used.
With a tricky setup with two macs, an ethernet hub and an iPhone, I manage to capture the traffic between the device and the server.
So far so good. However, when I fire up the app, a trace is shown in Wireshark (also very good), but all that is listed is in TCP protocol, where I am expecting HTTP protocol.
Now, I'm running out of knowledge.
Does this mean, that there is no HTTP communication going on at all, or am I seeing raw TCP packages that need to be assembled into HTTP? If the latter, how do I approach that, and will I ever see readable xml?
Thanks for your insights!
Actually, this question became obsolete, since I found exactly what I wanted to do here:
http://nickfishman.com/post/50557873036/reverse-engineering-native-apps-by-intercepting-network
I am working on a project of P2P instant messenger, like ichat, but just for LAN.
I use jmdns library for service discovering, and test with pidgin and log in as a Bonjour user. as so far,the service _presence._tcp.local. is well discovered,
then we know the user's information in LAN like name#host:port, so how to start a conversation with Bonjour client ?
I looked into XMPP, but it do not support P2P, but I can hardly find the library for the extension jingle which supports P2P.
maybe I should use SIP to make a conversation? but the packet format is compatible with Bonjour ? or I have to study the structure of packet exchanged?
Can anyone explain a little about how does ichat work for LAN?
Many thanks for your kind help！
I think you're a little confused.
Bonjour is a mechanism for finding a service. It is not for communicating with a service. Once you have found the name#host:port information, you are finished with Bonjour.
The next step will require you to talk a protocol that the service understands. The token _presence in the service string indicates that this is an XMPP service. You will need to talk XMPP to it. You cannot talk SIP to it. Have you tried opening an XMPP connection to the host and port you have found?
You talk about SIP and Jingle. These are used to set up an audio or video call. If you are writing an instant messaging program, you do not need to do this. XMPP alone is enough.
If you do want to support audio or video, then you will need one of those protocols. Because the service you have found is an XMPP service, you will need to use Jingle. If you don't have a library that can speak Jingle, you will have to write the code yourself. There is nothing in the Bonjour information that identifies a SIP service, so you cannot use SIP - unless you can make a different Bonjour query and find a SIP service.
I infer that you are working in Java. The most popular XMPP library for Java seems to be Smack.
Thanks for everybody's attention, now I have found something. XMPP doesn't support P2P mode, only supports clients-server-clients. but there is another standard "XEP-0174: Serverless Messaging" which is right for p2p chat in local network. DNS-SD + XEP-0174 , ichat works in this way.
as I used smack library, it do not support p2P; but someone did some changes, here is the link
http://issues.igniterealtime.org/browse/SMACK-262 .
I didn't try this XMPPLLConnection, I have looked into the source code of smack, it is based on socket connection. unfortunately there is not any java library for XEP-1074, so I have to work on xml stream over socket.
You may use SIP for that. MDNS will be your discovery mechanism, then you'd use plain SIP for calling, one you learned the URI you wish to dial.
SIPSIMPLE SDK (http://sipsimpleclient.com) implements this feature by sing this expired draft: https://datatracker.ietf.org/doc/html/draft-lee-sip-dns-sd-uri-03 it could be a good start.
Basically your client would generate a URI like sip:random_stuff#ip:port and then publish it along with a display name by using MDNS. The application also browses MDNS for peers on the LAN: _sipuri._udp for example. Once you get some URI you can just dial using SIP.
I'm researching methods to find ways for an event driven web application where a server can push data to the web page. Can I use APE ?? If so how can I use it and some resources please??
Thank You!!
People have been writing event driven servers since the dawn of the network. A simple google search will find your way.
However, since the client is a browser, your server must re-act upon keeping an HTTP connection open instead of simply doing socket work.
This is basically the only small difference than say an IRC server or a simple chat server.
I have a TCP server running on a machine. (implemented in Java). I need to connect to that server from a iPhone and send data to the server and also, receive data on the iphone when server pushes me data. So I need to be notified when data pushes from the server.
Is there a way to do this in Objective C(socket programming). Although I googled I couldn't find a solution. But I saw CFSocket etc.
Please anyone have a solution?
after a possible solutions in the internet, I found a nice asynchronous TCP and UDP socket Library here. (http://code.google.com/p/cocoaasyncsocket). This library worked really well for me so far. This wraps the CFSocket and CFStream.
Thanks for your replies.
You can use the CFNetwork family of classes to implement lower level sockets. Apple has an introduction document that describes the use of these classes.
CFSocket calls and similar will let you create sockets. You can then use CFStreamCreatePairWithSocket() to create a CFReadStreamRef and CFWriteStreamRef, which you can cast to NSInputStream* and NSOutputStream*.