Multiple IHDs
I recently purchased a Glowmarkt IDH/CAD which is now working fine. I still have the supplier-provided IHD - they seem to both work sumiltaneously with no issue, but occasionally the Glowmarkt loses its connection to the meter (as does the other, to be fair). I don't really need to run both, but is there any reason in principle why running two (or multiple) IHDs simultaneously would be an issue?
Comments
Apart from increasing traffic on your 2.4GHz network I can't see any issue as the Zigbee network is designed to support 100's of devices/sensors.
It was more the smart meter protocol I was thinking of - i.e. whether the protocol allows for multiple recipients of the data
If you want a definite answer you'll have to read the Zigbee smart energy profile which is what is used I believe.