@J-C.G. 

I just read a post who's saying :    You can't connect a device to TWO Hubs...

If nothing changed, i have my answer...

It could be a great option for TAPO Tp-LINK to create a proprietary protocol with the futur hub and devices who could permit to connect multi hubs to the sames detectors. This is possible with EnOcean protocol and i think with Zwave too...  zigbee, no.

Bye.

  @HmmmUK 

Interesting...

You mean that it exist WiFi acess points I can connect to my Two different Internet Routers (The ADSL one  and The 4G one) at the same time,

The access point will choose in priority the ADSL router and eventually will switch to the 4G router if ADSL doesn't work ?  and  vice versa ?

But with a preference for ADSL connection when this connection come back ?

Do you have models of WiFi access points who can do this ?    A  TP-LINK reference ?

Thank you.

  @HmmmUK   Thank you for your search.  I saw the possibility of the Failover configuration. But it's not what i want.

The 4G router is here in priority to turn back on or make a power reset of the ADSL router (ADSL router connected to a smart Plug managed by the 4G router), and vice versa...  because i live in an area where there is often ADSL and Power outages, and sometime the equipment not power correctly or in the right order and the network is broken too...  So, when i am away for a long time i want to have the possibility to power up all equipment, regardless of wich network falls...

Anyway,  connect ONE tapo detector to TWO Tapo hubs simultaneously is not possible, So...  i stop my search.