We're using our Raspberry Pi 3 to control some music and lighting over it's access point with a smartphone - completely offline, on a handcart. Now we have connection problems when we're getting to far away from our Pi (like 10-20 meters). Is there some practical solution we could use for our problem? Like some extender or antenna?
We have no internet on that WiFi, it's just used to get a connection from our smartphones to the handcart.