Firewall ports/destinations

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Due to Tado's critical dependency on internet connectivity I'm looking to install a failover 4G modem connected to my WAN-failover capable router.

I'd like to ensure that I restrict traffic to ONLY Tado-Related and would like to use as many elements as possible to do so, as opposed to JUST allowing the Tado gateway IP address.

Is there any documentation anywhere that states what ports/protocols & destination DNS names I can use to lock down the access to this interface?

Thanks!

Paul

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