Specifications

Chapter 17 – TCP App AT Commands
108 Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide
Optnum
Value
Format
Description
UDP
TCP
Client
TCP
Server
When set to FALSE, the packets will be sent
either,
a) by combining several small packets into a
bigger packet
b) when the data is ready to send and the stack
is idle.
default: 0
8
0-255
Time-to-live for IP packets
default: 64
RW
RW
RW
9
0-255
Type of Service
default: 0
RW
RW
RW
Notes: The +WIPOPT command will return ERROR if the socket is not active.
Option 3 is used to check whether an UDP socket is bound to any other UDP
socket or not. When the UDP socket is created without specifying the IP address
of the peer, then option 3 will be read as 0 ( FALSE). This is because there is no
destination IP address to communicate with. If the UDP socket is created by
specifying the peer IP address, the option will be read as 1 (TRUE). This is
because the peer IP address will be resolved by the DNS and the socket is said to
be bounded to the peer socket. Hence this option will be read as TRUE.
Closing a Service +WIPCLOSE
Description: The +WIPCLOSE command is used to close a socket session. AT+WIPCLOSE closes the local
socket at which point the index can be re-used. When AT+WIPCLOSE is used to close a TCP
socket, a TCP FIN is sent to the peer socket notifying the peer the local socket has closed.
When a TCP socket session is closed by its peer, an unsolicited event is generated
(+WIPPEERCLOSE). However, the local socket must still be closed using AT+WIPCLOSE.
Syntax: AT+WIPCLOSE=<protocol>,<index> Command Possible responses
Command
Possible Responses
AT+WIPCLOSE=<protocol>,<index>
OK
AT+WIPCLOSE=?
OK
AT+WIPCLOSE?
AT+WIPDATA=<protocol>,<index>
Values: <protocol>
1 UDP
2 TCP client
3 TCP server
<index>
1-8 Socket or session identifier
Close Service Status +WIPPEERCLOSE
Description: This unsolicited response indicates the local socket was closed by the peer. This response will
only be output for connected TCP sockets.