beep method Null safety
*beep
Just send a beep (some devices can't do that)
Implementation
Future<int> beep(int times, int st, int ft) async {
Map<String, dynamic> mapParam = new Map();
mapParam['times'] = times;
mapParam['st'] = st;
mapParam['ft'] = ft;
return await platform?.invokeMethod("beep", {'beepArgs': mapParam});
}