/// <summary>
        /// 响应设备连接断开消息
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="strDeviceMac"></param>
        private static void deviceDisconnect(IntPtr ctx, IntPtr strDeviceMac)
        {
            GCHandle thisHandle = GCHandle.FromIntPtr(ctx);
            RbtNet   rbtNetThis = (RbtNet)thisHandle.Target;

            if (rbtNetThis != null && rbtNetThis.deviceDisconnectEvt_ != null)
            {
                rbtNetThis.deviceDisconnectEvt_(ctx, strDeviceMac);
            }
        }