Subject:
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Re: JAVA RMI and RCX brick
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 16 Aug 1999 17:38:56 GMT
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Original-From:
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Paul Speed <pspeed@augustschell.comIHATESPAM>
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Viewed:
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727 times
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Andy Settle wrote:
>
> First an introduction: I've been lurking for some time and know
> that similar discussions have taken place recently however I feel
> this has a different slant:-
>
> Background:
>
> I've been developing an event monitoring system for a major telco
> with Java using it's lightweight distributed object mechanism RMI
> (Remote Method Invocation). Don't switch off yet if your not into
> Java - I'll try to explain. What RMI allows is a program on a
> machine to present a service by a given name that remote
> applications can utilise. These services are referenced in a
> similar manner to a URL. For example:
> RMI://carp.fish.net/BankTeller is the reference to the
> BankTeller service/Object on the machine carp.fish.net (made up
> BTW).
>
> What's this gotta do with the RCX? Well here goes - make the RCX
> interface with a wireless PCMCIA ethernet network card (like the
> Apple AirPort: http://www.apple.com/ibook/airport.html or similar)
> and present a service of RCX. Hence: RMI://myrcxathome.aol.com/RCX
> and not only can I talk to one or more RCX's from my machine but
> it would be possible to talk to a REMOTE RCX - no matter where in
> the world they are.
>
> Ok. wireless PCMCIA lan card is probably an expensive solution but
> wireless serial would probably work if the base had the RMI service
> in in instead.
>
> In my opinion RMI is probably a lot easier to implement than
> getting a full JVM into an RCX brick and the possibilities are
> endless.
>
> Am I being too fanciful?
No, not really. However, I think you should take a look at
Jini. Try starting here:
http://www.javaworld.com/javaworld/jw-08-1999/jw-08-jiniology.html
Jini is one step beyond RMI and is intended for this type
of application. (ie: simple devices on a network.)
As a matter of fact, Sun demonstrated Jini and MicroJava
by using wireless Palm Pilots to control a few Mindstorms Robots.
(I wish I could remember the link to the story.) The RCX's just
implemented a simple protocol that talked to the PC. The PC had
a Jini server implementation for the 'bots. The Palm Pilots had
Jini clients that communicated over the wireless link to control
the 'bot servers.
Have fun,
-Paul (pspeed@progeeks.com, http://www.progeeks.com/)
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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