@Philbert, I think this gives me all I need to know. Thanks for your support.

Thanks very much for the quick reply. My Deco's are indeed in the range 192.168.68.* so I will port forward at the router and on the Deco via the App. Does this solution assume my target device...

Hi guys, I have a Huawei B315s-22 router connecting to the internet via SIM card, with which my 4G signal provides good speed. I have a number of TP-LINK AC2200 Deco M9 Plus devices, with one of them...