该方案能实现视频通话,还有文字聊天、发送文件、P2P连接等非常实用的功能。-This scheme can realize video calls, and text chat, send files, P2P connection function very useful.

In wireless sensor network，cluster algorithm of nodes is all effective approach and key technology to implement energy saving and flexible management．To improve security and lifetime of clustering network，a secure clustering was pro— posed based on t