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Part 1 – AT Commands for All Universal IP Devices
#OTCP – Open a TCP Connection
Chapter 5 – TCP Commands
Definition:
Syntax:
id:
Values:
This command sent by the attached host directs the TCP/IP stack to open a TCP connection to
the specified TCP server. Once an IP link is established, the attached host can open a TCP
connection at any time (except when the TCP/IP stack software is already in a process using
TCP resources).
This TCP connection may be closed by the remote TCP server or by the attached host via
sending an ETX character on the serial port ( depending on the DLEMODE parameter ).
DLEMODE Value Notes:
Depending on the DLEMODE value, the attached host may close this TCP connection by sending
an ETX character.
? If the DLEMODE parameter is set to 1, the TCP/IP stack will only interpret an <ETX> character
as a close request if it’s not preceded by a <DLE> character. As a consequence, the attached
host must send <ETX> characters preceded by <DLE> characters, and it must also code
<DLE> characters in <DLE><DLE>. Similarly, each <ETX> character present in the payload
data of the TCP frame will be coded by the TCP/IP stack on the serial port as <DLE><ETX>.
Each <DLE> character will be coded as <DLE><DLE>. The attached host must then decode
the TCP socket flow to remove these escape characters.
? If DLEMODE is set to 0, the host cannot close the TCP connection (unless an error occurs).
If the remote TCP server closes the connection, the TCP/IP stack sends an ETX character on the
serial port.
AT#OTCP=id
Enter a Profile Setting: 1 or 2 {1,2}
DELMODE
TCPPORT
TCPSERV
TCPTXDELAY
#OUTPORT – UDP/TCP Local Port Number
Definition:
Syntax:
Values:
Default:
Controls the local port that the UDP/TCP connection is bound to.
Set Value: AT#OUTPORT=<Port Number value>
View Values: AT#OUTPORT? or AT#VALL
Set the port number local connection will use:
From 1 to 5 numeric digits (0 to 9).
Note: Numbers above 65,535 are illegal since port identification fields are 16-bits long in the
IDP header.
37500
Universal IP AT Commands Reference Guide (Document S000457G)
34
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