Quote Originally Posted by Ioannis View Post
OK. Thank. Digi has new devices for over 40Km range although these do not support the Zigbee stack.

Hope they will update the firmware.

I tried them and seems that this is true. Also powe can be adjusted for lower consumption.

Modules are small enough.

Ioannis

I know.

The project which got me into all this stuff was a remote machine monitoring project.
The ultimate hardware, for me, is the 6LowPAN protocol. Here, each node gets an IPV6 IP address and messages can therefore be routed to them directly via the internet without any translation.

Unfortunately, 6LowPAN implementations are thin on the ground, and I didin't get a large enough grant to buy the units from Sensinode which are the best application of 6LowPAN I've seen so far.

AVR (boo hiss) make a development board called a 'Raven' and there is a free RTOS and 6LowPAN implementation for use with those boards but then each node needs a Raven board.