Hi Kraig,
1) Due to a change in licensing SDK 12.5 is being replaced with SDK 12.6, which will be released for download end of this week. Our apologies for the temporary unavailability.
2) The main components on the NHS3100UCODE board are:
- NHS3100 with a NFC interface at 13.56MHz (magnetic coupling, typical distances up to 4cm, depending on antenna and reader)
- SL3S4011 with UHF interface in the 860 to 960 MHz band (typical distances in meters range depending on antenna and reader)
3) The SL3S4011 does not support energy harvesting for external sensors. I am not aware of demo boards supporting UHF powered sensors.
Kind regards,
Patrick