Does this also work with the older H. One (+) or how is FB/Hub connected? And do 15 devices work if the FB can do this (e.g. Elite with hub incl.).

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I guess the question is whether a Harmony One (+) can communicate with the Harmony Hub. Unfortunately, this is not possible as the Harmony One (+) only communicates via infrared.
What we can say for sure is that the remote control of the Harmony Hub is connected to the Hub via 2.4Ghz. A maximum of eight devices can be controlled via the Hub, which is the central unit. The limitation can be circumvented with a somewhat awkward tweak, provided the original remote control is available:

https://www.cnet.com/how-to/how-to-hack-a-harmony-remote-to-control-more-devices/

What is easily possible, however, is that most hubs can be paired with a touch and a non-touch remote control:

https://support.myharmony.com/en-us/harmony-add-on

I assume that the device limit of the "highest" device is used - probably 15 devices.

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Question about Logitech Harmony Hub

Does this also work with the older H. One (+) or how is FB/Hub connected? And do 15 devices work if the FB can do this (e.g. Elite with hub incl.).