To detect errors in the SMPP communication
with your service provider
you might need to enable low level logging in the application. In this
document we give you information on how to enable this feature to be able
to track down errors in the communication
To enable low level communication logging in the SMPP service
connection, please check the "Low level communication logging" checkbox in
the "Logging" tab of the SMPP service provider connection's configuration form
(Figure 1). If this checkbox is enabled, you will see the SMPP protocol messages
that are sent to the SMSC and that are received from the SMSC (Figure 2).
Basically there are three important SMPP protocol message: the
login message, the submit message, the incoming SMS message. The SMPP login
message is sent by Ozeki NG to the SMSC and if the username and password in the
login message was correct, the SMSC sends a response message back. The SMS
submit message is also sent by the Ozeki NG SMS software to the SMSC and the
SMSC sends an SMPP response if the message was accepted. If you are receiving
an SMS, the SMSC send in an SMPP protocol message and the Ozeki SMS software
replies to it, to confirm it has accepted the message (Figure 2).
If you take a closer look at the protocol messages, you will
see, that in the low level communication log you see if the message was sent
by the Ozeki software or it was received by the Ozeki software. If the message
was sent by the Ozeki software
you will see a "<-" sign in front of the SMPP protocol data, if it is
an incoming SMPP protocol data you will see a "->" sign in front of
the log entry (Figure 3).
For example if you are hunting for incoming messages, you
should see an SMPP PDU sent to your system from the SMSC in the low level log.