private static async Task SendEventMessageAsync(GattDeviceService service, WifiEventId wifiEventType)
{
Debug.WriteLine($"Sending Wi-Fi config message protocol event: '{wifiEventType}'");
byte[] eventMessage = MessageProtocolFactory.CreateEventMessage(wifiEventType);
await BluetoothLeHelper.WriteAsync(eventMessage, service, MessageProtocolRxCharacteristicId);
}
public static byte[] CreateEventMessage(WifiEventId wifiEventType)
{
/* Event format:
*
* | Offset Bytes | 0 | 1 | 2 | 3 |
* | 0 | Preamble |
* | 4 | Length | Msg Type | Reserved |
* | 8 | Category ID | Event ID |
*
* Length : UINT16 (LSB) - the message length excluding the first 6 bytes.
*/
byte[] message = new byte[12];
ByteArrayHelper.WriteBytes(Preamble, message);
ByteArrayHelper.WriteLsbUInt16(6, message, 4); // Length
message[6] = (byte)MessageType.Event;
ByteArrayHelper.WriteLsbUInt16((ushort)CategoryId.WifiControl, message, 8);
ByteArrayHelper.WriteLsbUInt16((ushort)wifiEventType, message, 10);
return(message);
}
