AT+FTPRETR="daichutun.txt"
sdfdsfewfewfsdfdsfsfsfsf
AT+FTPRECV=10
AT+FTPRECV=10
AT+FTPRECV=10
AT+FTPRECV=10
AT+FTPRECV=10
AT+FTPRECV=10
ati9i8i7
ati9i8i7
at+GTPKGVER?
at+GTPKGVER?
ati9i8i7
at+GTPKGVER 
cAT+MIPCALL=1