DCT Antares SB, User Manual

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6.56. (XAUO) UDP ORIGIN PORT
6.56 (XAUO) UDP Origin Port
By default Antares SB
TM
chooses the value of the UDP-origin-port when
sending UDP datagrams. Usually after a GPRS session has been estab-
lished, the chosen port is 1024. This value is incremented and reused ac-
cording to the unit’s TCP/IP stack. There are some situations where it
is desired no to have the unit chose this value. With the
XAUO
command,
the user can set the origin UDP port to any value. The accepted values
range from 1 to 65535 and if the special value of 0 is used (default value)
the unit is instructed to freely chose the origin port. Notice that fixing the
UDP origin port has nothing to do with the UDP Server Port (
XAUP
): The
fixed UDP-origin port will not listen for queries until the unit generates an
UDP datagram. Meanwhile the UDP Server Port is always listening. Also
notice that the UDP origin port of the datagram containing the response
to a query sent to the unit throwout the UDP server port will not have as
origin port the value set with the
XAUO
command, but the value of the UDP
server port (
XAUP
).
The message has the following format:
AAAAA
Chars Item Format Value Meaning
5 Origin Port AAAAA 0-65535 UDP Origin Port: ’A’ sets the originating port
for UDP datagrams sent by the unit. When the
special value of
00000
is used, the unit does
not use a fixed value but dynamically changes it
according to internal mechanisms. The default
value is
00000
, meaning that by default the unit
will use a dynamic origin port.
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