Mostly working.
 - Fixed ND code. ND is a local AT command and each radio responds
   separately.
 - Does not handle adding or removing nodes on the fly.

Problems:
 - Seems to occasionally log temp data from coordinator. This happens
   when a node is removed from the nework on the fly.
 - The node with the voltage regulator reports crap readings. Don't
   know if this is the sensor or the circuit. The battery powered
   one appears to be rock-solid.