my app is advertising and scanning using ble in android.it needs to do it in a loop of maybe 1 hour every day (probably less),but now ,for the testing I'm trying to make it work even more. after some time I realized that it can't run eternally without having bugs. I'm getting error numbers 2 and 4 (one for advertise and one for scan). before I can see the errors in the log ,there is always a line like:
01-26 19:59:09.509 D/BluetoothLeScanner: onClientRegistered() - status=133 clientIf=21
the number near clientIf is getting bigger all the time ,till the error,so my guess is that the scanner/advertiser is collecting data about the scanned/advertised devices. I saw some options for solutions,like waiting some time between the actions or making mBluetoothGatt.close();
the waiting didnt help,and my app is not using the gatt (I'm not making any pairing inside the app),so I thought maybe i'll initialize BluetoothLeScanner/BluetoothLeAdvertiser again, but it didn't prevent the number near clientIf to raise and of course the error occured again.
does anyone have any Idea how can I "zero" the number near clientIf ,or of course other way to prevent the errors from happening ? thanks !
the most relative question I read was this:
Android stops finding BLE devices: onClientRegistered() - status=133 clientIf=0
edit: here I will add the code of the ble. this is the scan code:
public class StDataCentralBle {
private static final String TAG = ScannerFragment.class.getSimpleName();
private static final long SCAN_PERIOD = 15000;
private BluetoothAdapter mBluetoothAdapter;
public BluetoothLeScanner mBluetoothLeScanner;
private ScanCallback mScanCallback;
private Vector<String> ScanResultArray;//intended to replace the adapter
private Context context;
private Handler mHandler;
//todo open this:
public StDataCentralBle(Context context){
this.context=context;
public void setBluetoothAdapter(BluetoothAdapter btAdapter) {
this.mBluetoothAdapter = btAdapter;
mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();
}
public void startScanning() {
if (mScanCallback == null && mBluetoothAdapter!=null && mBluetoothAdapter.isEnabled()) {
Log.d(TAG, "Starting Scanning");
// Will stop the scanning after a set time.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
Log.v("ble_process","BT state is: "+mBluetoothAdapter.getScanMode());
stopScanning();
}
}, SCAN_PERIOD);
// Kick off a new scan.
mScanCallback = new SampleScanCallback();
mBluetoothLeScanner.startScan(buildScanFilters(), buildScanSettings(), mScanCallback);
Toast.makeText(context, "started scan", Toast.LENGTH_SHORT).show();
} else {
Log.v("ble_process","didnt start scan");
}
}
/**
* Stop scanning for BLE Advertisements.
*/
public void stopScanning() {
// Stop the scan, wipe the callback.
if(mBluetoothLeScanner!=null && mBluetoothAdapter.isEnabled() && mBluetoothAdapter.getState()==21) {
mBluetoothLeScanner.stopScan(mScanCallback);
Log.v("ble_process", "stopping scanning");
}
mScanCallback = null;
if(mBluetoothAdapter!=null)
mBluetoothLeScanner=mBluetoothAdapter.getBluetoothLeScanner();
Toast.makeText(context, "stoped scan", Toast.LENGTH_SHORT).show();
}
/**
* Return a List of {@link ScanFilter} objects to filter by Service UUID.
*/
private List<ScanFilter> buildScanFilters() {
List<ScanFilter> scanFilters = new ArrayList<>();
ScanFilter.Builder builder = new ScanFilter.Builder();
// Comment out the below line to see all BLE devices around you
builder.setServiceUuid(Constants.Service_UUID);
scanFilters.add(builder.build());
return scanFilters;
}
/**
* Return a {@link ScanSettings} object set to use low power (to preserve battery life).
*/
private ScanSettings buildScanSettings() {
ScanSettings.Builder builder = new ScanSettings.Builder();
builder.setScanMode(ScanSettings.SCAN_MODE_LOW_POWER);
return builder.build();
}
/**
* Custom ScanCallback object - adds to adapter on success, displays error on failure.
*/
private class SampleScanCallback extends ScanCallback {
@Override
public void onBatchScanResults(List<ScanResult> results) {
super.onBatchScanResults(results);
for (ScanResult result : results) {
}
}
@Override
public void onScanResult(int callbackType, ScanResult result) {
super.onScanResult(callbackType, result);
Log.v("onscanResult","onscanRes");
Toast.makeText(context.getApplicationContext(), "scan resulted ! ", Toast.LENGTH_SHORT).show();
//get the data from advertise:
byte[] Service_Data_bytes=result.getScanRecord().getServiceData(Constants.Service_UUID);
if(Service_Data_bytes!=null) {
String Service_Data = new String(Service_Data_bytes);
Log.v("scanRes:", Service_Data);
createNewcross(result);
}
}
public void createNewcross(ScanResult scanResult){
Log.v("createNewcross ", "new cross " );
byte[] Service_Data_bytes=scanResult.getScanRecord().getServiceData(Constants.Service_UUID);//gilad
String Service_Data = new String(Service_Data_bytes);
String other_user=Service_Data ;
}
@Override
public void onScanFailed(int errorCode) {
super.onScanFailed(errorCode);
Log.v("ble_process","scan_failed_error_code: "+errorCode);
Toast.makeText(context.getApplicationContext(), "scan failed! ", Toast.LENGTH_SHORT).show();
}
}
}
}
this is the code that operate the scanning:
public void start_central_ble(Context context){//scaning service
Log.v("ble_process","start_central_ble");
if (mBluetoothAdapter.isEnabled())
central.setBluetoothAdapter(mBluetoothAdapter);
central.startScanning();
}
the timer that operates it:
private class StartCentralTask extends TimerTask {
Context ServiceContext;
private StartCentralTask(Context context) {
ServiceContext = context;
}
@Override
public void run() {
// run on another thread
mHandler.post(new Runnable() {
@Override
public void run() {
start_central_ble(ServiceContext);
}
});
}
}
