All the code contained here is related to the DronE android app. This app is used with ESP32 for remote control. DronE repository - Source code. Play Store link - Place where you can download the app.
The "-" says us it's a name and comes "value" after space after name. It define "-name value". int asInt (const char* name, int ifNotValue) // return value of "name" as integer type float asFloat ...