No beacon detected using altbeacon api - ibeacon

Question

One iPhone is used to transmit ibeacon using locate app (the proximity uuid is 2F234454-CF6D-4A0F-ADF2-F4911BA9FFA6). The android phone is used to detect the ibeacon.
When I debug， I can get the following message:
08-30 15:33:57.051 D/BluetoothLeScanner(27939): onScanResult() - ScanResult{mDevice=6D:CC:9D:8D:3A:F3, mScanRecord=ScanRecord [mAdvertiseFlags=26, mServiceUuids=null, mManufacturerSpecificData={76=[2, 21, 47, 35, 68, 84, -49, 109, 74, 15, -83, -14, -12, -111, 27, -87, -1, -90, 0, 0, 0, 0, -59]}, mServiceData={}, mTxPowerLevel=-2147483648, mDeviceName=null], mRssi=-31, mTimestampNanos=58705755631306}
However in function RangingBeaconsInRegion, there is no beacon.
void RangingBeaconsInRegion(object sender, RangeEventArgs e)
{
await ClearData();
var allBeacons = new List<Beacon>();
if (e.Beacons.Count > 0)
{
foreach (var b in e.Beacons)
{
allBeacons.Add(b);
int rssi = b.Rssi;
System.Diagnostics.Debug.WriteLine(rssi.ToString());
}
var orderedBeacons = allBeacons.OrderBy(b => b.Distance).ToList();
await UpdateData(orderedBeacons);
}
else
{
// unknown
await ClearData();
}
}
The following is my implementation:
public class MainActivity : XFormsApplicationDroid, IBeaconConsumer
{
public MainActivity()
{
}
protected override void OnCreate(Bundle bundle)
{
BeaconManager beaconManager = BeaconManager.GetInstanceForApplication(this);
var iBeaconParser = new BeaconParser();
iBeaconParser.SetBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24");
var parser = new BeaconParser();
parser.SetBeaconLayout("m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25");
beaconManager.BeaconParsers.Add(parser);
beaconManager.Bind(this);
}
public void OnBeaconServiceConnect()
{
//obtain the beaconservie object of android
var beaconService = Xamarin.Forms.DependencyService.Get<IbeaconService>();
beaconService.InitializeService();
//beaconService.StartTransmitting();
beaconService.StartMonitoring();
beaconService.StartRanging();
}
public void InitializeService()
{
m_beaconManager = InitializeBeaconManager();
}
private BeaconManager InitializeBeaconManager()
{
BeaconManager bm = BeaconManager.GetInstanceForApplication(Xamarin.Forms.Forms.Context);
//set the scan window
bm.SetForegroundScanPeriod(1100L);
//subscribe to the events;
m_monitorNotifier.EnterRegionComplete += EnteredRegion;
m_monitorNotifier.ExitRegionComplete += ExitedRegion;
m_monitorNotifier.DetermineStateForRegionComplete += DeterminedStateForRegionComplete;
m_rangeNotifier.DidRangeBeaconsInRegionComplete += RangingBeaconsInRegion;
// constructs a new region object to be used for ranging or monitoring
m_tagRegion = new Region("myUniqueBeaconId", Identifier.Parse("E4C8A4FC-F68B-470D-959F-29382AF72CE7"), null, null);
m_tagRegion = new Region("myUniqueBeaconId", Identifier.Parse("B9407F30-F5F8-466E-AFF9-25556B57FE6D"), null, null);
m_tagRegion = new Region("myUniqueBeaconId", Identifier.Parse("2F234454-CF6d-4A0F-ADF2-F4911BA9FFA6"), null, null);
m_emptyRegion = new Region("myEmptyBeaconId", null, null, null);
bm.SetBackgroundMode(false);
//
//bm.Bind((IBeaconConsumer)Xamarin.Forms.Forms.Context);
return bm;
}
public void StartRanging()
{
BeaconManagerInstance.SetForegroundBetweenScanPeriod(0L);
m_beaconManager.AddRangeNotifier(m_rangeNotifier);
m_beaconManager.StartRangingBeaconsInRegion(m_tagRegion);
m_beaconManager.StartRangingBeaconsInRegion(m_emptyRegion);
}

Answer 1

If you look closely at the code that sets up the beaconParsers, you'll see that two are constructed, but only one is added like this:
beaconManager.BeaconParsers.Add(parser);
Adding a second call to add the other beacon parser should solve the problem.

Answer 2

Thanks, that's my mistake! After I add a second call to add the other beacon parser! there is still some strange situation: I did not launch any beacon transmitter, but when I debug, I got the following output: D/BluetoothLeScanner( 6864): onScanResult() - ScanResult{mDevice=58:D6:74:3A:34:C5, mScanRecord=ScanRecord [mAdvertiseFlags=6, mServiceUuids=null, mManufacturerSpecificData={76=[12, 14, 0, 126, 81, 116, -16, 10, 52, 84, 15, 98, 113, 29, -15, 34]}, mServiceData={}, mTxPowerLevel=-2147483648, mDeviceName=null], mRssi=-89, mTimestampNanos=122142418198514}
08-31 09:11:13.943 D/BluetoothLeScanner( 6864): onScanResult() - ScanResult{mDevice=58:D6:74:3A:34:C5, mScanRecord=ScanRecord [mAdvertiseFlags=6, mServiceUuids=null, mManufacturerSpecificData={76=[12, 14, 0, 126, 81, 116, -16, 10, 52, 84, 15, 98, 113, 29, -15, 34]}, mServiceData={}, mTxPowerLevel=-2147483648, mDeviceName=null], mRssi=-89, mTimestampNanos=122142560625598}. It seems that one beacon is detected.