DCT Antares SB, User Manual

Page: 204 / 238

6.45. (XAKA) KEEP ALIVE
6.45 (XAKA) Keep Alive
Qualifiers :
S
,
Q
,
R
This message is used to activate/deactivate a keep-alive to a given IP-type
Destination Point (see the
XADP
message). A keep-alive option should be
avoided as increases the transmission cost. Use this option if you need to
be able of interrogating the unit at any time and the unit is working behind
a NAT. The keep-alive transmission will prevent the NAT from breaking
the connection between your server and your unit due to inactivity. The
keep-alive packet contains the unit’s ID without any TAIP message so your
server has to expect these special-non-TAIP messages. This option can be
used both on TCP and UDP IP-type destinations. The message has the
following format:
ABBB
Chars Item Format Value Meaning
1 Destination
Point A 0-9 The IP-type Destination Point index for which
the keep-alive is being configured.
2 Inactivity time BBB 015-999
minutes
or 000 Inactivity time in minutes. Use
000
to deactivate
the keep-alive mechanism. All DPs but DP 9
default to 000. DP 9 defaults to 60 minutes.
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