Quote Originally Posted by Normnet View Post
Is the mesh in hardware or is it code with a C or Basic example?

Norm

Norm,
these particular modules are based on the Ember EM250 chips, which have the Zigbee stack built in, written in C code.

you could, if yoiu wanted, blow away all signs of the Zigbeee software and use the devices as ordinary IEEE 802.15.4 compatible radio modules, IE just use the hardware and lay your own software on top. Ember provide the required development tools to do that, as do (I think) Telegesis, who will help you out with any special versions of firmware you might require.

Once I started to play I realised that it might be fun to try to implement something similar in PicBasic for use with the vanilla 433MHz (etc) modules. The software stack needn't be too large. Microchip offer two stacks for their hardware, one if them is Zigbee 2006, the other is their own protocol called 'MiWi', which is a 'star and cluster' topology capable of sending messages between nodes which are a couple of hops away from each other.
The Microchip stacks are written in C and are free to download from the Microchip website, and may provide some ideas. MiWi is a significantly smaller protocol than Zigbee, and can be implemented in a smaller pic than is required for Zigbee

Chris