123456789
123456789AT+FTPPUT="testfile4",5,0
AT+FTPPUT="testfile4",5,0AT+FTPCWD="testdir0811"
AT+FTPOPEN="39.108.157.65","ftptest","ftptest"
AT+FTPOPEN="39.108.157.65","ftptest","ftptest"
AT+MIPCALL=1