Re: Java applet - UDP or TCP?

["estratosapiens" <dberenguer@xxxxxxxxxxxxxxxxxxx>]

Thanks, Kevin.

I'm thinking in implementing a custom protocol for my application. I
don't see the interest of using xAP with TCP and point to point
communications.

Daniel.

--- In xAP_developer@xxxxxxx, Kevin Hawkins <lists@u...> wrote:
>
> xAP being UDP is intended for LAN operations. If you wish to reliably
> pass xAP between devices on the internet (cf intranet) then you should
> use TCP.  There are two routes to this , firstly you could use one of
> the existing xAP router applications or secondly you should create a
> socket level connection at your application level. You can still send
> the xAP packet exactly as you did for UDP.  The difference is that
once
> you move to TCP you forfeit the broadcast nature of xAP If this is
> important, and in most cases it will be,  then you should  repeat
> received packets locally at each end of the internet link using UDP
and
> a broadcast address.   This is effectively what the xAP router does,
> although often they have some added features to support multiple
> endpoints, security and selective message filtering across the link.
>
>    Kevin
>
> James has the XServer router..
> http://www.mi4.biz/modules.php?name=Content&pa=showpage&pid=37
>
> & Patrick has a router ...
> http://patrick.lidstone.net/haweb/router.htm
>
>
>   Kevin
>
>
> estratosapiens wrote:
> > I was planning to develop a Java Web applet that should stablish
a
> > communication socket with the Web server. This Web server already
> > "speaks" xAP, so, I thought about the possibility of
using xAP between
> > the Web server and the Java applet (instead of the typical TCP
socket
> > connection). I have some doubts:
> >
> > Using UDP instead of TCP is not (maybe) a good idea when
communicating
> > over Internet. Here I have no more idea than what I've read in
some
> > posts. Has anyone get xAP to work over Internet? Problems with
routers?
> >
> > If I decide not to use xAP or UDP for this application, is there
any
> > communication standard for home/industrial automation and related
with
> > TCP client/server connections? I know Modbus but I'm not sure
whether
> > it's TCP oriented.
> >
> > As you see, I'd like to avoid dealing with different
communication
> > protocols. Nevertheless, I know that every thing has its place.
> >
> > Any light over this subject is wellcome.
> >
> > Thanks in advance,
> >
> > Daniel.
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
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>