topic Re: Tree or Mesh network demo? in 8-bit Microcontrollers

Tree or Mesh network demo?

UdovdM — Fri, 12 Jan 2007 18:56:09 GMT

I am trying to make a tree or mesh network which will do the following:
End devices act as triggers. They only send data.
An end device (RFD) will send data to his nearby receiver (FFD).
That reciever then forwards the data to an other reciever connected to a computer.

Since the computer reciever may not phisically be in the center, I think it must be a mesh network between the FFDs.
Any FFD may be coordinator, depending on which powers up first.

MyWirelessApp can only be used to connect 2 devices as PAN coordinator and end device?

Does anyone know were to find the MyStarNetworkApp demo code?
I already got the User's Guide (802154MSNAUG.pdf)

Are there any other MyApp demos?

Regards,

Udo

13192-SARD (MC9S08GT60 + MC13192); CodeWarrior HC08 SE 3.1 ; PEMicro USB HCS08 Multilink

Re: Tree or Mesh network demo?

EvanYin — Sat, 13 Jan 2007 10:56:07 GMT

Hi, I do made a tree network. There's three kind of node in the PAN: PAN Coordinator, Common Coordinator and End device. Any node can send data to another by tree mode routing. And I wish I can construct a mesh network too, that must be better than tree mode...

I wish I can help u.

Re: Tree or Mesh network demo?

UdovdM — Mon, 15 Jan 2007 15:48:40 GMT

Hi Evan Yin,

So a common Coordinator is any AC-powered FFD, e.g., router.

Any FFD may be PAN coordinator, depending on which powers up first.
But does the PAN coordinator have to be at the top/bottom of the tree?

I think a tree-network will work.

Udo

Re: Tree or Mesh network demo?

marcial — Thu, 18 Jan 2007 05:11:33 GMT

Hi Udo.
I am also trying to establish a tree network. Currently I have the PAN coordinator
and some devices which are sending information to the PAN coordinator.
The coordinator is the root of the tree and I want to have some coordinators (routers) associated to that PAN coordinator, but no success!
( As soon as the coordinator is associated to the PAN coordinator and tracks the beacon,
it looses the sychronization to the PAN coordinator when it sends the MLME.start-Request. )

Maybe Evan could help us?

I would also be very interested in the steps to take for such a tree establishment.

I could also paste some code snippets if desired.

1000 Thanks in advance and maybe we can exchange some info/experience, Udo.

Best regards, Enrique Marcial-Simon

Re: Tree or Mesh network demo?

UdovdM — Fri, 19 Jan 2007 18:00:50 GMT

Hi Enrique,

For my application:
The RFD's don't know who to send their data to. It is more like a Producer/Consumer Architecture. All FFD's/controllers have a list of which devices to listen to.

I don't know anything about the beaconing.
should your coordinator only resend, or first filter for messages directed to himself.
If the tree splits (3 other coordinator), how would the router know which other coordinators acknowledge to wait for?

Udo

Re: Tree or Mesh network demo?

marcial — Wed, 24 Jan 2007 01:53:52 GMT

Well beaconed tree ist explained in the Freescale IEEE 80215.4 reference documentation.
The PAN coordinator sends a signal within a certain period.
Very simply explained:
Devices and coordinators listen to that signal.
And as soon as here the signal, they send some information to the PAN coordinator or to a coordinator an association request. If they receive an 'OK' they just listen to the signal periodically and look if their parent node have some new info for them.

Using this synchronization scheme there is no collision and that's we wanted to use.

Enrique

Re: Tree or Mesh network demo?

marcial — Wed, 24 Jan 2007 01:54:49 GMT

sorry the documentation is in the IEEE user manual.