how to use fudx to demo show ...
-s server mode,[./fudx -s 6001] ,listen at 6001 port
-c 192.168.xx 6001 ,client mode,and ip and port
-u upload test
-d download test
-f file upload/download testfile[c:/test.dat] test
-F with fec mode
-b and fix bew with 20480[20KB] upload test
-SD setup send dir
-TD setup save dir
-l no print log
-t run time xx seconds
-m send total buffsize and printf spend time .for example 1MB buffs. -m 1024000