public static DispatchTimer ScheduledDispatchTimer(long delay, DispatchQueue queue, TimerHandler block)
{
var dt = new DispatchTimer(delay: delay, queue: queue, block: block);
dt.Schedule();
return(dt);
}
///
/// Core Bluetooth CBCentralManager callback when we discover a beacon. We're not super
/// interested in any error situations at this point in time.
///
public override void DiscoveredPeripheral(CBCentralManager central, CBPeripheral peripheral, NSDictionary advertisementData, NSNumber RSSI)
{
var serviceData = advertisementData[CBAdvertisement.DataServiceDataKey] as NSDictionary;
if (serviceData != null)
{
var eft = Eddystone.FrameTypeForFrame(serviceData);
// If it's a telemetry frame, stash it away and we'll send it along with the next regular
// frame we see. Otherwise, process the UID frame.
if (eft == BeaconInfo.EddystoneFrameType.TelemetryFrameType)
{
var data = Eddystone.TelemetryDataForFrame(advertisementData);
if (deviceIDCache.ContainsKey(peripheral.Identifier))
{
deviceIDCache[peripheral.Identifier] = data;
}
else
{
deviceIDCache.Add(peripheral.Identifier, data);
}
}
else if (eft == BeaconInfo.EddystoneFrameType.UIDFrameType ||
eft == BeaconInfo.EddystoneFrameType.EIDFrameType)
{
if (!deviceIDCache.ContainsKey(peripheral.Identifier))
{
Debug.WriteLine($"deviceIDCache does not contain key: {peripheral.Identifier}.");
return;
}
var telemetry = deviceIDCache[peripheral.Identifier];
var serviceUUID = CBUUID.FromString("FEAA");
var _RSSI = RSSI.Int32Value;
var beaconServiceData = serviceData[serviceUUID] as NSData;
if (beaconServiceData != null)
{
var beaconInfo = (eft == BeaconInfo.EddystoneFrameType.UIDFrameType) ?
Eddystone.BeaconInfoForUIDFrameData(beaconServiceData, telemetry, _RSSI) :
Eddystone.BeaconInfoForEIDFrameData(beaconServiceData, telemetry, _RSSI);
if (beaconInfo != null)
{
// NOTE: At this point you can choose whether to keep or get rid of the telemetry
// data. You can either opt to include it with every single beacon sighting
// for this beacon, or delete it until we get a new / "fresh" TLM frame.
// We'll treat it as "report it only when you see it", so we'll delete it
// each time.
deviceIDCache.Remove(peripheral.Identifier);
if (seenEddystoneCache.ContainsKey(beaconInfo.BeaconId.ToString()))
{
var value = seenEddystoneCache[beaconInfo.BeaconId.ToString()]?["onLostTimer"];
if (value != null)
{
var timer = (DispatchTimer)value;
timer.Reschedule();
}
this.beaconScanner.ScannerDelegate?.DidUpdateBeacon(beaconScanner, beaconInfo);
}
else
{
// We've never seen this beacon before
this.beaconScanner.ScannerDelegate?.DidFindBeacon(beaconScanner, beaconInfo);
var onLostTimer = DispatchTimer.ScheduledDispatchTimer(this.onLostTimout,
DispatchQueue.MainQueue,
(DispatchTimer obj) =>
{
var cacheKey = beaconInfo.BeaconId.ToString();
if (seenEddystoneCache.ContainsKey(cacheKey))
{
var beaconCache = seenEddystoneCache[cacheKey];
var lostBeaconInfo = beaconCache["beaconInfo"] as BeaconInfo;
if (beaconCache != null && lostBeaconInfo != null)
{
this.beaconScanner.ScannerDelegate?.DidLoseBeacon(beaconScanner, beaconInfo);
seenEddystoneCache.Remove(beaconInfo.BeaconId.ToString());
}
}
});
var newMap = new Dictionary <string, object>()
{
{ "beaconInfo", beaconInfo },
{ "onLostTimer", onLostTimer }
};
if (seenEddystoneCache.ContainsKey(beaconInfo.BeaconId.ToString()))
{
seenEddystoneCache[beaconInfo.BeaconId.ToString()] = newMap;
}
else
{
seenEddystoneCache.Add(beaconInfo.BeaconId.ToString(), newMap);
}
}
}
}
}
else if (eft == BeaconInfo.EddystoneFrameType.URLFrameType)
{
var serviceUUID = CBUUID.FromString("FEAA");
var _RSSI = RSSI.Int32Value;
var beaconServiceData = serviceData[serviceUUID] as NSData;
if (beaconServiceData != null)
{
var url = Eddystone.ParseURLFromFrame(beaconServiceData);
if (url != null)
{
this.beaconScanner.ScannerDelegate?.DidObserveURLBeacon(beaconScanner, url, _RSSI);
}
}
}
}
else
{
Debug.WriteLine("Unable to find service data; can't process Eddystone");
}
}