scan method

void scan()

Implementation

void scan(){

   if(scanNow){
     HBleMissiveManage.stopScan();
     Future.delayed(
         const Duration(milliseconds:50),(){
           HBleMissiveManage.scan();
           scanNow = true;
     });
   }else{
     HBleMissiveManage.scan();
     scanNow = true;
   }

}