/// <summary>
/// Sends a packet out over Bluetooth Low Energy. Spins up a watcher
/// for advertisements from nearby servers who can receive the packet.
/// </summary>
/// <param name="packet"></param>
private void SendPacketOverBluetoothLE(
byte[] packet,
IPAddress destinationAddress
)
{
// Fire up the Bluetooth Advertisement packet write
// watcher
IPv6ToBleAdvWatcherPacketWrite packetWriter = new IPv6ToBleAdvWatcherPacketWrite();
// Start the watcher. This causes it to write the
// packet when it finds a suitable recipient.
packetWriter.Start(packet,
destinationAddress,
staticRoutingTable
);
// Wait for the watcher to signal the event that the
// packet has transmitted. This should happen after the
// watcher receives an advertisement OR a timeout of
// 5 seconds occurs.
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
while (!packetTransmissionFinished ||
stopwatch.Elapsed < TimeSpan.FromSeconds(5)
)
{
;
}
stopwatch.Stop();
// Check transmission status
if (!packetTransmittedSuccessfully)
{
Debug.WriteLine("Could not transmit the packet" +
" over Bluetooth LE successfully."
);
}
else
{
// We successfully transmitted the packet! Cue fireworks.
Debug.WriteLine("Successfully transmitted this " +
"packet:\n" + Utilities.BytesToString(packet) +
"\n" + "to this address:\n" +
destinationAddress.ToString()
);
}
// Stop the watcher
packetWriter.Stop();
// Reset the packet booleans for next time
packetTransmissionFinished = false;
packetTransmittedSuccessfully = false;
}
//---------------------------------------------------------------------
// Listeners for when packets are transmitted or received
//---------------------------------------------------------------------
/// <summary>
/// Awaits the asynchronous packet transmission operations by listening
/// for the event from the Adv watcher that signals whether the packet
/// transmitted successfully.
///
/// This is so a client can know when the packet has finished the
/// transmission process.
/// </summary>
/// <param name="sender"></param>
/// <param name="eventArgs"></param>
/// <returns></returns>
private void WatchForPacketTransmission(
IPv6ToBleAdvWatcherPacketWrite sender,
PropertyChangedEventArgs eventArgs
)
{
if (eventArgs.PropertyName == "TransmittedSuccessfully")
{
packetTransmissionFinished = true;
packetTransmittedSuccessfully = sender.TransmittedSuccessfully;
}
}
