As a project, I was looking into putting up to 3 SRV1 (not Blackfin) nodes in a field to survey temperatures. I want them to able to know where each other are in the field relative to one another. I also thought it would be interesting to have them act as relays to the 'base station', if one is out of range (but I did some initial reading on Xbee and I think that it might do that anyways).  For rudimentary direction finding, is there a way to measure signal strength with the Xbee Pro module (and if so, how do go about modifying the Xbee firmware to send this info out)? If someone could point me in the right direction, that would be great.