Technical information

Secure Socket Protocol
2-60 AT+i Commands Reference Manual May 31, 2008
<pass> Password for user authentication. If special characters are used,
the password must be specified within quotes. It is customary that
servers that allow anonymous login request an e-mail address as a
password.
<accnt> Some FTP servers require an account in order to allow a certain
subset of the commands. In this case, the account name must be
specified when opening the FTP link.
@ The optional @ is used to flag the Force PASV mode. When @ is
specified, W24 uses only the PASV method when opening a data
socket to server for FTP data transfer.
Result Code:
I/<FTP handle> Upon successfully connecting to the FTP server and
authenticating the user, a socket handle is returned. The handle
<FTP handle> is used to reference the FTP session in all
subsequent FTP commands.
I/ERROR Otherwise.