distanceFromTakeoff property
The Tello's distance from its takeoff point, presumably in cm.
Implementation
Future<double> get distanceFromTakeoff async {
String distanceFromTakeoffResponse = (await _command("tof?"));
RegExp distanceFromTakeoffRegex = RegExp(r"((\d+|.)(\w+))");
RegExpMatch matches =
distanceFromTakeoffRegex.firstMatch(distanceFromTakeoffResponse)!;
return double.parse("${matches[2]}");
}