ZigBee mesh analysis software

[xAPPO]

Has anyone managed to find a utility (commercial or free) that will allow me to examine the Mesh topology and path strengths of my Plugwise network. I have an issue where some segments become lost during night hours (intereference I guess) and I want to supplement the network with a repeater but with 30+ nodes it's quite complex to know where I should place the repeater. I have seen some work by 'Digit' in another forum here but I think that is XBee specific.

K