achieved using java Tftp (Sftp) client and server. In this process uses a "state" of mechanism : the client and server operation at the beginning of the same state, through user input or the internal operating procedures of the mechanisms, procedures can be transferred to a different state, in a state where different procedures to achieve different functions

sftp
....\classes
....\.......\Client_Get$ACKDelayClass.class
....\.......\Client_Get$ACKResendClass.class
....\.......\Client_Get$RWDelayClass.class
....\.......\Client_Get$RWResendClass.class
....\.......\Client_Get.class
....\.......\Client_Put$DataDelayClass.class
....\.......\Client_Put$DataResendClass.class
....\.......\Client_Put$DelayClass.class
....\.......\Client_Put$ResendClass.class
....\.......\Client_Put$revthread.class
....\.......\Client_Put$RWDelayClass.class
....\.......\Client_Put$RWResendClass.class
....\.......\Client_Put$WaitClass.class
....\.......\Client_Put.class
....\.......\Client_State.class
....\.......\ComClass.class
....\.......\FileIOClass.class
....\.......\Idle.class
....\.......\PacketCode.class
....\.......\Server_Start$DataDelayClass.class
....\.......\Server_Start$DataResendClass.class
....\.......\Server_Start$RDelayClass.class
....\.......\Server_Start$RResendClass.class
....\.......\Server_Start$WDelayClass.class
....\.......\Server_Start$WResendClass.class
....\.......\Server_Start.class
....\.......\Server_State.class
....\.......\Sftp.class
....\.......\SimpleIO.class
....\.......\src_sftp.txt
....\.......\State.class
....\Client_Get.java
....\Client_Put.java
....\Client_State.java
....\ComClass.java
....\FileIOClass.java
....\Idle.java
....\PacketCode.java
....\Server_Start.java
....\Server_State.java
....\Sftp.java
....\sftp.jcd
....\sftp.jcp
....\sftp.jcu
....\sftp.jcw
....\SimpleIO.java
....\src_sftp.txt
....\State.java

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