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 18:21:58 GMT
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Original-From:
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Jonathan Knudsen <jonathan@oreilly.com*Spamless*>
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Viewed:
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1938 times
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There's more on JINI and MINDSTORMS here:
http://pandonia.canberra.edu.au/java/jini/tutorial/Jini.xml
Jonathan
At 01:38 PM 8/16/99 -0400, Paul Speed wrote:
> 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
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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