I am in the UK. I have a network of a number of P110s. I have tried to add another P110 to the network but have failed. I have tried to do so on many occasions. Is there a step by step illustrated gui

I want to change the function of a P110. I have followed the reset procedure but I cannot get the plug to add the device on the app. Can you advise how I can link the plug to the app please? Thank you