소켓 ...

http://stackoverflow.com/questions/29991116/serversocket-accept-doesnt-works-in-second-time

http://prashantandroid.blogspot.in/2013/07/android-client-connected-with-socket.html

http://stackoverflow.com/questions/4489232/java-server-socket-stuck-on-accept-call-android-client-java-server

http://warmz.tistory.com/entry/%EC%86%8C%EC%BC%93-%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%98%EB%B0%8D-TCPIP-nm-%EC%B1%84%ED%8C%85

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