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I found the FCC test report for the connected flap: https://fccid.io/XO9-IMPD00003
The main report https://fccid.io/XO9-IMPD00003/Test-Report/Test-Report-3666579
This lists the "intentional radiators" in the kit, namely the RFID at 126 and 133 kHz, and the 2.4 GHz radio for transmitting to the hub. That is listed as 802.15.4 using O-QPSK modulation. https://en.wikipedia.org/wiki/IEEE_802.15.4
That's Zigbee - or at least something close to it. With the right SDR setup we may be able to decode the frames.
Plenty more detail in the FCC filing.
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