5.1. GETTING STARTED
The GSM registration status is indicated by the
status
LED. This LED
is solid whenever the unit is not registered on GSM. Although the unit is
not registered, it could be searching for the operator which is a normal con-
dition. Other un-registered conditions may be detected by means of the
RP
message. When the unit is registered on GSM the
status
LED should be ei-
ther blinking or completely OFF. In this state the LED shows the received
signal strenght. Refer to the
Operation
chapter for more information on
LEDs and to the TAIP reference for the
RP
message.
The GPRS session status is shown by the
On line
LED. The unit may only
be registered on GPRS whenever it is GSM-registered. When the GPRS
session is up and ready the
On line
LED is either blinking or solid. Al-
though this LED being OFF indicates that the GPRS session is not ready
it could mean that the unit is trying to establish the session and it could
already be GPRS-Attached
1
. A blinking
On line
LED indicates that GPRS
registration is OK, but shows that there are problems communicating with
a remote IP server which is a non-GPRS related problem.
5.1.3
Creating a Destination Point (DP)
Now that we have the unit working on the GSM/GPRS network the unit is
ready to send and receive communications from IP servers and phone num-
bers. For our example we need to create a
Destination Point
(DP) which
holds our remote server IP number or address and the serving port that it
is using for listening to TCP connections or UDP datagrams. As discussed
on the
Operation
a
Destination Point
can work either with TCP or UDP
protocols, you can change this with the ’C’ flag of the
Destination Point
configuration, see the
XADP
message. For this example we will work with a
remote server that listens for TCP connections.
If you do not already have an AVL server listening for TCP connections
see the
Operation
chapter before continuing.
For this example we will use a server located on the address
avl.server.com
which listens for TCP connections on the port
2145
. If we want to use name
addresses instead of IP numbers we have to use the
XADP
message instead of
the deprecated
DP
message. With the
XADP
message we can also specify an
IP number so the use of
DP
is obsolete and is maintained only for backward
compatibility.
The
Destination Point
index we chose is only restricted in our example
by the DPs destinate to be IP hosts (00 to 09). We chose then DP 00 for
no other special reason:
>
SXADP0000avl.server.com;2145
<
An IP address could also be specified. Supposing we wanted to use the
IP number
192.168.0.1
we would have to send:
1
Being attached to the GPRS network is not the same as having completed the
GPRS session start-up.
107
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