startScan method
Implementation
void startScan(OnScanResult onScanResult,{int? scanTime,OnScanDone? onScanDone}){
_onScanDone=onScanDone;
_onScanResult=onScanResult;
int time=0;
if(scanTime!=null){
time=scanTime;
}
_channel.invokeMethod("startScan",{"scanTime":time,"scanSpaceTime":null});
}