This Processing-Android sketch showcases an example application for the ESP-WiFi-RC Receiver.
Since the usual android controls are not multitouch capable a small set of sliders and a joystick like 2D controller pad were made.
The sketch depends on hypermedia's UDP library
For the app to work both, the Smartphone and the ESP-WiFi-RCV device must be connected to the same wifi network, which normally is the network spawned by the ESP-WiFi-RCV device.
The app should discover the receiver by its MDNS (Bonjour) service name.
See the ESP_WiFi_RC_Android.pde for a starting point.