Spot Measurement
I finally got around to tinker with things again and opted to digress from the zigbee standalone mote-like development to revisit the power measurement.
I have three types of sensors to measure currents lying around and decided that given I already wrote the C++ classes and modbus integration for total home energy consumption, I could easily create a spot measurement modbus slave device to monitor specific loads. Note that all my arduinos+zigbee are modbus slave devices and only the mote-like devices shall use a different protocol.