Question: how to check who is connected to my tp link wifi router?
Answer: Go to your router settings through any browser, either on your PC or smartphone. Typing out 192.168. 0.1 (for TP Link router) or 192.168. ... 
Login using your username and password. The default is : ... 
TP Link : Go to Wireless > Wireless statistics. D-Link : Go to Status > Wireless Clients.