I have a TL-WR802N and am using as a client system.  I have linked this to an oil reading system called an Olive.  It's a community system that measures the amount of heating oil I have left in the tank.  I was using a 4G system by EE.  Now I have a landline system to the wireless router which is linked to Plusnet, which is our broadband provider (this may not be relevant to the problem, but I thought it might be useful.  I could not get the link from the TP-Link TL-WR802N from my Windows 10 desktop computer.  The OLIVE system keeps sending me emails that there are no communication readings coming through.  I tried several things, connecting to - http://192.168.0.1 /  http://tplinkwifi.net.   Neither of these things worked.  I then reset the unit and re-tried these two settings again and nothing. I do see the unit on my desktop computer along with my service provider and the Roku unit.  I also tried accessing it by clicking on that link, which goes to the two settings.  I get the same response -