Comment by nyrikki

3-5 years typical, when I was looking at the newer ones at an auction site to play with most were IR with some bluetooth etc..

The link you provided appear to probably be IR based, but it was one of the brands that was a dead end for official docs when I was looking at them.

The newest ones seem to be using Periodic Advertising with Responses (PAwR) that was introduced in Bluetooth 5.4, but I couldn't find those type for a price I was willing to pay.

Nordic Semiconductors has an Apache licensed SDK and RToS, I didn't find the device and time to play with it but bookmarked it.

https://www.nordicsemi.com/Products/Development-software/nRF...