Technical information

Chapter 2: AT+i Commands Reference

May 31, 2008 AT+i Commands Reference Manual 2-33

Direct Socket Interface

+iSTCP - Open and Connect a TCP Socket

The Socket Command Abort may be used to abort prematurely.

Note:

W24 uses the port range [1025 .. 2048] when assigning default local ports. The host

should refrain from specifying local ports in this range to ensure that Error 218 is not

generated as a result of requesting local ports that overlap internal assignments.

+iSUDP - Open a Connectionless UDP Socket

Syntax: AT+iSTCP:<host>,<port>[,<lport>]

Opens a Transmission Control Protocol (TCP) client socket and attempts to

connect it to the specified <port> on a server defined by <host>.

Parameters:

<host> Logical name of the target server or a host IP address.

<port> 0..65535, target port.

<lport> Optional local port on W24.

Command Options:

<host> The server name may be any legal Internet server name that can be resolved

by W24's DNS (Domain Name Server) settings. The server name can also

be specified as an absolute IP address given in DOT form.

<port> It is assumed that the server system is listening on the specified port.

<lport> Can be optionally specified to force W24 to use lport as the local port when

opening the TCP socket. If unspecified, W24 allocates a port from its

internal pool

Result Code:

I/<sock handle> Upon successfully opening and connecting the TCP socket to the

<host>:<port>, a socket handle is returned. The socket handle <sock

handle> is in the range 0..9 and used to reference the socket in all following

socket commands.

I/ERROR Otherwise.

Syntax: AT+iSUDP:<host>,<rport>[,<lport>]

Opens a UDP (User Datagram Protocol) socket and sets the remote system's

<host>:<port> address.

Parameters:

<host> Logical name of the target server or a host IP address, or 0.0.0.0 to open a

non-connected socket.