public void DataReceived(object sender, PacketDataReceivedEventArgs e)
        {
            Log4netLogger.Info(MethodBase.GetCurrentMethod().DeclaringType, $"Get {e.TotalBytesRead} byte(s): 0x{e.DataRead} from {e.DestinationTuple.RemoteEndPoint}");
            if (e.TotalBytesRead == 8 && e.DataRead.Substring(0, 6) == "AB0106" && e.DataRead.Substring(14, 2) == "00")
            {
                try
                {
                    byte[] ImeiStream = e.BytesRead.Skip(3).Take(4).ToArray();
                    int    ImeiInt    = BitConverter.ToInt32(ImeiStream.Reverse().ToArray(), 0);
                    string ImeiWithLeadingZerosLength20 = ImeiInt.ToString("00000000000000000000");
                    Log4netLogger.Info(MethodBase.GetCurrentMethod().DeclaringType, $"Imei: {ImeiInt}. With leading zeros: {ImeiWithLeadingZerosLength20}");
                    string key   = $"Product_{ImeiWithLeadingZerosLength20}_Heartbeat";
                    string value = _connector.StringGet(key);

                    //if found the key (value == null)
                    if (value != null)
                    {
                        _connector.StringSet(key, DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fff"));
                        PacketConnection.Send(new byte[] { 0xAB, 0xFF, 0x06, e.BytesRead[3], e.BytesRead[4], e.BytesRead[5], e.BytesRead[6], 0x01, 0x01 }, e.DestinationTuple);
                    }
                }
                catch (Exception ex)
                {
                    LogUtil.Log4netLogger.Error(MethodBase.GetCurrentMethod().DeclaringType, $"Error during DataReceived (UDP)", ex);
                }
            }
        }