Hello.
Is it possible in SMSTools3 before sending SMS to see how the SMS looks in pdu format?
For example, in the log file.
In other words, see the output of the pdu-converter.

With loglevel = 7 you can see what kind of PDU is sent to the modem. If you want to test some things without actually sending SMS, use a modem setting sending_disabled = yes.

Testing can also be done without a real modem connected, in this case use a modem setting modem_disabled = yes.

many thanks
I'll try

Thank you. Indeed, with loglevel = 7, the sms in pdu format is visible in the log file.

2 questions.

1) The modem_disabled = yes setting is enabled. device = / tmp / modemfile
A long SMS is used. In pdu it is divided into several parts. For example, in 2 parts.
Why after the formation of the first part of the message in pdu
there is a delay of 5 to 15 seconds?
For example,
2017-10-25 21: 52: 17.7, GSM1: PDU to ...: AT + CMGS = 154 0051 ....
2017-10-25 21: 52: 29,5, GSM1: SMS sent, Message_id: 1, To: ..., sending time 12 sec.
After this interval, (in the example 12 seconds), the second part of the pdu message is generated.
Why is there such a long delay (sending time 12 sec.)?
modem_disabled = yes. device = / tmp / modemfile
The modem does not really exist.
Can this delay be removed to 0-1 seconds?
Long studied the configure SMSTools3, but did not find such a setting.

2) Is it possible to send a long message directly to the pdu converter and quickly get a response from it to some other file or to the terminal or somehow else?

1) As these settings (modem_disabled, sending_disabled) are made for testing purposes, smsd simulates the sending time. Current version does not have a setting to avoid this delay. To get rid of this, sources should be modified:

In the src/smsd.c search for t_sleep(4 + getrand(10));
Comment that line out: //t_sleep(4 + getrand(10));
Or change it to t_sleep(1); if one second is reasonable delay.
Save and recompile.

2) Use these global settings:
sent = /var/spool/sms/sent
store_sent_pdu = 3

When a message is "sent", original message file is moved to this directory. It contains one or more header lines beginning with "PDU: ". The header part ends when first empty line is reached.

Did 1). 2). Everything worked out. Many thanks.