VEGA INSYS Modem GPRS 5.0 - Manual (Page 43)

INSYS GPRS 5.0 serial Connection
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If the test is successfully performed, the message "+PPP-IP OK" is displayed.
If the test fails, the GPRS connection is terminated (message +PPP-IP RELEASE) and
the TCP Listen mode is reestablished.
To save costs if there is a problem with availability, the waiting time between the
repeat attempts will grow for each subsequent attempt.
20 seconds after restart or if the last connection setup was successful
80 seconds after the first failure
320 seconds after the second failure
1280 seconds after the third failure
1 hour for each additional failure
The number of dialing attempts for the TCP Listen operation can be limited with
AT**TCPLISTENWAITRST=<n>
. For example, the INSYS GPRS 5.0 serial is re-
started with AT**TCPLISTENWAITRST=3 after the third dialing attempt
(20s+80s+320s). This will restart the dialing cycle. The default value for this set-
ting is 255.
Note
This setting increases the availability of the INSYS GPRS 5.0 serial
and its application. However, the increased number of dialing at-
tempts that are performed shortly one after the other, higher con-
nection costs may occur. This depends on the terms of the contract
with the mobile network provider.
The INSYS GPRS 5.0 serial offers systems with dynamic IP addresses the option to
communicate the IP addresses allocated by the provider during the current GPRS
dial-up into TCP Listen ((+PPP-IP SETUP) to a server. More in Chapter "6.10 Virtual
COM Port".