AVR-Chat

not sure why, at $19 for a module w/Zigbee you'd want to, you can roll
your own meshed network. You can start with the public domain code
from UCSB as I recall - part of the TinyOS work based on YEAH! AVRs. 
Some vendors (I won't name names) that are not in the ZigBee camp are
adapting this public domain code and calling it a product.

A big deal with the ZigBee alternatives is to avoid the alliance
membership (low dues) and speed time to market with "sleeping routers"
 which is not in ZigBee 1.0. Only sleeping end-nodes.

--- In AVR-Chat@yahoogroups.com, "larry barello" <yahoo@...> wrote:

>
> There is nothing stopping you from implementing your own "mesh"
network -
> but it will be a ton of work...
> 
> One of the Atmel Zigbee partners (in Russia) claims full mesh
networking.
> They base their module off of a m128 + radio chip.  The numbers are
*very*
> good (makes the Xbee look bad) but they are only interested in
volume OEM
> sales (10k+) - sigh.  That might be changing as a year has passed...
> 
> Maxstream says they are working on full Zigbee compliance & mesh
networking.
> It might be close.  But I am done with my original project so I
don't really
> care until funding pops up for a "version 2".  By then I think mesh
> networking will be more available.  
> 
> I am sure that in a year there will be a lot more options.
> 
> Cheers!
> 
> -----Original Message-----
> From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On
Behalf
> Of Mark Nowell
> Sent: Friday, February 09, 2007 9:28 AM
> To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] Re: Zigbee modules etc, etc
> 
> Well I'm starting to think that Larry's "isn't quite ready for prime 
> time" is about the only sensible explanation for all the evasion and 
> mystery I'm encountering when trying to figure out which kit to use for 
> Zigbee mesh-networking. We really need mesh networking if this is going 
> to work at all for us. It seems none of the module-makers wants to 
> confess that they don't have a full working implementation of Zigbee
yet 
> but do any of them have such a thing? If TI/Chipcon is the answer then 
> who makes modules which fully exploit this technology?
> 
> I apologise that this has drifted way OT but I (very naively) thought 
> there might be an AVR-based answer to my question - now I'm
beginning to 
> wonder if I've got to wait 6 months to a year for _any_ real mesh 
> networking solution.
> 
> Mark
> 
> 
> larry barello wrote:
> > The project I worked on doesn't say "Zigbee" in the documentation.
 We say
> > "802.15.4" radio protocol.  I just use the mac addressing in a star
> > configuration with the end nodes sleeping most of the time.
> >
> > Mesh networking sound sexy but apparently isn't quite ready for prime
> > time...  Unfortunately (or fortunately) I was blinded by the hype
when I
> > specified the Xbee modules for the project :L  
> >
> > They are working out very well even though we can't use
mesh-networking to
> > extend our reach.  It turns out that the PRO, with higher transmit
power,
> > 6db increase Rx sensitivity and whip for the hub communicates fine
with
> > Regular modules over the required 85' (highly congested space with
802.11
> > and other interference).  Regular modules (with chip antennas) on both
> ends
> > only communicate reliably over 12' of separation.
> >
> > Cheers!
> > -----Original Message-----
> > From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com]
On Behalf
> > Of dlc@...
> > Sent: Friday, February 09, 2007 8:09 AM
> > To: AVR-Chat@yahoogroups.com
> > Subject: Re: [AVR-Chat] Re: Zigbee modules etc, etc
> >
> > Now I'm confused.  The manual specifically addresses sleep mode and
> > indirect messaging in a non-beacon network.  Is that then a custom
XBee
> > protocol that isn't Zigbee?
> >
> > In my conversations with Maxstream they don't even have mesh
networking,
> > only star networking since their Zigbee does not yet have mesh.
> >
> > ???
> > Now I'll have to go back to them and talk about it all over again.
 Also,
> > if you are going to use "Zigbee" in your product literature and
you have a
> > Zigbee compliant (and tested) module like the XBee units then you only
> > need to have the $1500 membership and ONLY on the year that you
release
> > the product to the public.  You only need to be listed in the Zigbee
> > alliance (apparently) not a full voting member.  That is how I
understand
> > it from when I took classes on Zigbee, but that was last year,
this year
> > may be different...
> >
> > DLC
> >   
> 
> 
> 
>  
> Yahoo! Groups Links
>