I want to write 2 Device Communication Servers for use with OpenGTS (Enterprise). Devices are Teltonika FM4200 and WirlessLinks Piccolo STX. can u give me a some tutorial or something useful. I still don't have idea on it.
Instead of DCS you can use Traccar server which already supports FM4200, the second device might already be supported as well, I just need some message examples to verify that. Configuration file to integrate two systems can be found here.
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i am developing a chat application for local environment where our office employees can chat easily so here I am getting some conflicts when I am trying to send message over the IP but there IP being change dynamically so how can i resolve it .
First of all, I recommend using a well established solution like a local Jabber Server installation and using a client that supports the required features.
If you really want to pull this off on your own, you'll need at least a central controlling point (Server) to abstract Users from their Endpoint.
Configured user would then have to login to that server to signal they are ready to receive messages. Doing this, you have the momentarily correct IP that you can then use to relay messages or to give to other clients wanting to send to that user. Also consider that users may want to use more than one client (they have 2 PCs?). You probably wouldn't want to bind one user to one client device.
Also note that you will have to create a decent protocol for all this. This can be quite tedious if you want similar features to for example Skype Chat or ICQ, or some derivate of XMPP / Jabber.
This leads me again back to my first suggestion: Better use something that already exists. Installing and configuration of that can already be effort enough. Coding all that by yourself, though will take way more effort.
And I didn't even go into status/statusmessages, groupchats, sending/sharing Files, sending messages while User is away/offline ...
Can anyone give me a quick rundown on how to send faxes in Java using Fax4J? The tutorial provided by the javadocs is sketchy at best. In particular, it doesn't teach you how to specify which fax modem you are calling; it only says FaxClient faxClient=FaxClientFactory.createFaxClient(); but how does it work?
I downloaded the full fax4j code, and I noticed some files called FaxModem.java in there. How are those used?
For someone who actually authored fax4j, cant agree with the comment about the tutorial because i am not sure you read it.
The factory is explained returns a client which is backed by an engine called spi.
There are many different spi types.
Some would use windows native api, some would run a process, others would send emails and http requests to remote providers and it is all based on your fax4j configuration.
All cofiguration options possible are detailed in the tutorial so for example if you want to send an email to spcific mail server that converts it to fax ypu would set email address and other needed properties in your fax4j.properties file.
So based on the way you are sending requires different config and its all in the tutorial.
However you didnt write how you want to send and of course fax4j doesnt support everything.
I think the main bulk of users use the windows native api spi so they actually dont configure anything for fax4j and instead configure the fax settings in their windows machine and thats it
For my research I need to implement an internet gateway in Android. similarly to what Open Garden does to make android utilize facility provided by its own to use its provided stream etc as an internet connection. This app does not require any root access.
So my question is very narrow: how to create such a facility. and how to instruct Android to use it instead of an already existent LTE connection for example. I am not asking about protocols etc. just how to integrate something like that into the android without the use of root access; what APIs etc.
Well; after some short research the actual solution is to implement a VpnService; make localhost the server and from there route your pakcets anywhere you wish:) there seems to be trouble bugs not fixed yet (people actually waiting for yeara for google to fix) in cases like when other apps do not handle detect the vpn connection properly. Anyway:) here's the answer. I'll be on my way now.
I am trying to create a java program making use of SSDP to get the list of IP's of the systems connected to a server. Is it possible? If so can anyone tell me the method? Because as per I read they have just mentioned we can find the particular service over the network not all the services.
thanks in advance
The idea of "IPs being connected to a server" doesn't really match what happens in SSDP, but you can search for all services and devices that advertize over SSDP in a given local network: use the search target ssdp:all instead of a specific service type string when you send your M-SEARCH message.
If you are thinking of building this from scratch, I suggest using a UPnP (or SSDP) library/framework: it'll probably make life easier.
I am interested in putting a chatting functionality as part of an application.
What I am interested in:
I would like to keep my application instances acting as peers, i.e.
I would prefer not to write also some server module to handle
message communications
I would like it to be able to use it with exising IM accounts. E.g.
someone can use it using his MSN account or any other client
account he may have, same way he would use MSN Messenger or Tor client etc
I googled and found that there are some Java MSN libraries available and also some other libraries that support IM e.g. SMACK for JABBER etc (not sure what that is) but I am not sure if the latter could be used for option 2 I mention.
My preference on 2 is because I assume that this way a user could do chat no matter where he is while in other solution I assume that some network infrastructure e.g. with routable IPs etc would be required. Am I wrong here?
Does anyone have expererience with Java IM libraries? Are for example any issues e.g. with different MSN versions or something?(Don't know if the protocol has been changing often to matter for me).
What would be the best path/option for my requirements?
I would go with a Jabber based approach. Jabber (also called XMPP) is an open protocol with lots of implementations and supports connecting to other IM services via transports. That way you would not have to deal with changes to the Windows Live protocols. You can rely on the open source community to provide that functionality for you.
Edit: It seems, that Windows Live even allows native XMPP access.
If you like, you can always set up your own Jabber server to provide a tighter integration with existing user accounts. In that case you wouldn't need to write the whole server.