I think it has been reported before that some BT hubs have 5GHz wifi and 2.4GHz wifi networks which communicate with the outside world but not with each other. I have experienced that myself. Check if your phone or tablet is connecting to wifi on the 5GHz network some times, usually when you are within line of sight of the hub. In that case, it may not see your 272 which is on the 2.4Ghz net or ethernet. You can turn off the 5Ghz network, putting your phone and 272 on interconnected networks, and you might find this is the solution.