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I want to write an application based on ad-hoc network by using WiFi on windows(or android), but I don't know how to begin. I have some questions as follow:
Do I need to implement routing protocol?
Do I need to implement a client or server or both on one device?
How to Connect multiple devices to each other?
I can use C# or JAVA, Can anyone recommend some information?
Please forgive me for my poor English, Thanks.
Hy,
just to answer a few of those questions:
Routing: yes, you need a special routing protocol for an ad hoc network, since according to 802.11 there is nothing specified for multihop routing in ad hoc nets per default. For windows the only one i know avaible and built is OLSR-Routing. Check for OLSR Daemon. For linux there are much more built. But the choice which routing protocol you are using are strong dependent on the network structure and mobility behaviour of the nodes. Google for routing protocols in MANET (Mobile Ad Hoc Networks) or MeshNetworks.
C#: there is a NativeWifi API for .NET which enables you to do a lot of things in Wireless networks (including Ad Hoc) like connection and so on....
Client/Server: in an ad hoc network a node acts not as a client or server, it acts as a router so to say...
Hope i could help
Rene
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I'm trying to find the best way creating a mobile application, and connected with a cloud database(or server).
So my first question is: Is it good practice to communicate directly into a database from a mobile app?
If yes, which is the best database for this work? Azure? Oracle? Firebase...?
If no, which is the best service to communicate first? And which protocol?
What is the most recommended way? Does it matter what os(windows?mac?) my server will use?
The best approach if to build a REST API to communicate with your server. But if you don't want to do that, you should look for Firebase. Firebase is one of the best platform to build mobile and web application really fast. It provide you with Authentication, Real-Time Database, Storage, hosting crash reports and many more. Using firebase, you can set security rules on who can write to you database thus it eliminate the risk of unauthorized access to the database.
Also keep in mind that, if you use firebase, you should structure your db in such a way that the number of read and write requests are as minimal as possible, as firebase could be a bit expensive if not used properly.
Its better to build a api in between. Doing queries in your app is kinda risky.
You could use a nodejs framework for this e.g. Sails.js or Express.js
For a cloud database, Firebase is a very easy to implement and work with Database. There are plenty of information resources about the setup and work process.
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I'm trying to create a simple multiplayer game. As I understand the main principle is to make clients communicate ether directly to each other or to the server. Since I want some game data to be available online on my website, I'm inclined to create database that users will be connected to.
Is this valid?
Is SQL/MySQL good idea to use in such scenario?
Would windows azure be any help?
Please help me. I really need some guidance here.
If you want to store game data for use on a web site, you will definitely want to store it in some sort of database. Just so you know, SQL is a querying language for databases, MySQL is a DBMS (Database Management system) that you use SQL to "talk" to.
However, you certainly don't want to store ALL of your game interaction in a database, as database operations tend to take a long time (at least as far as a computer is concerned). Your server should have some sort of socket (probably TCP) that is talking to all the clients, passing messages and so forth.
The class reading from this socket would raise events or otherwise update the database for the information you want to be displayed on your website. Windows Azure would be a perfectly valid hosting platform for the website/server app, and so would pretty much any other web hosting solution. Some of the socket code could be easier going through Azure, so that may give it an advantage when choosing your host.
Please let me know if I can provide any more information.
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I have designed a virtual classroom software for students with disabilities, it is being used by some local colleges. The limitation of the software is that the students within a Local Area Network (LAN) are able to connect with server in order to receive audio/video data. I have used sockets to connect clients with server. Now the demand for the software has increased and students outside of the LAN want to connect to server using their internet connection. I am aware that I have to rewrite the server/client connectivity modules, but I am not sure how to go about connecting clients to server using internet.
I think one way is to use a vpn but I am not really sure.
Any guidance would be much appreciated. Thanks in advance.
1)First, the good news: You may not have to rewrite your client server code (at least not completely)
2)This question may be better suited for serverfault
3)Get with your IT staff to discuss your needs. Developing the app without consulting them is asking for trouble, because they're going to be the ones to ensure the proper firewall ports are opened. Even if you had a VPN, without consulting them there's no guarantee it would even work. Because you would need
4)A routable IP address. Yes, DYNDNS or something similar would work, but that introduces another single point of failure. No IT staff? Then
5)Find an IT consultant knowledgeable in basic networking, or make heavy use of serverfault.
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I'm currently thinking about developing a sockscap-like tool with some cool new features and a nice WPF gui.
For those who don't remember:
SocksCap was a tool that allowed you use any application with the use of a SOCKS4/5 Proxy... So e.g. you could play games with another IP without using VNC and alike.
However I'm not much of a network guy, so I'd love some input on how to "socksify / proxify" from an external application within a windows environment. As this is supposed to be a project, not a "quick and dirty" thing I'm only into "clean and generic" approaches instead of "modify HOSTS entry" or "plugin for each application"...
So how would someone with knowledge about networking programming start his research about redirecting (routing?) an applications traffic via a proxy?
Thanks for any help :-)
Google always helps.
Under windows there is something similar to socksify:
FreeCap -- is a program for transparency redirect connections from programs through SOCKS server. In fact that some programs hasn't native SOCKS support (for example Internet Explorer), In this case FreeCap will be helpful, transparently redirect all connections requests through SOCKS server.
The internal implementation of this seems hijacked the socket call of the client applications.
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Our customer has asked that our application be able to communicate through HTTPS. The application itself is a C#.NET application, a client/server/database sort of application. My understanding from my programmer is that this is an additional layer of unnecessary encryption, but because our customer has asked for it we're going to try to provide it anyway.
What I'm looking for is a way to setup an SSL environment that does not require me to install a webserver. Although we could recompile our server into a DLL that could allow us to be hosted through IIS, the idea doesn't exactly thrill me (we're not wanting our customer to have to implement IIS in addition to our solution).
In any case, the idea is to provide an SSL tunnel over port 443 that our C#.NET remoting packets (they're http packets at the moment) may pass through.
Does anybody have any suggestions which may prove helpful in this regard? Do we need to add any additional handling to the communication process to allow this? (My gut says no, but I'm not the programmer.)
Mike
Check out this article on MSDN:
.NET Remoting: Writing an Asymmetric Encryption Channel Sink
First header is 'Support For HTTPS'