DartLsl_push_chunk_strt typedef
        DartLsl_push_chunk_strt =
     int Function(lsl_outlet out, Pointer<Pointer<Char> >  data, int data_elements, double timestamp)
    
    
    
Implementation
typedef DartLsl_push_chunk_strt =
    int Function(
      lsl_outlet out,
      ffi.Pointer<ffi.Pointer<ffi.Char>> data,
      int data_elements,
      double timestamp,
    );