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SMSTools3 Community » Help and support Bottom

[answered] message_id bit length

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Author Post
Member
Registered:
Aug 2009
Location: Belgium
Hello,

With my current setup, message_id's are 8-bit values.

Does this limitation/feature come from

- the SMSC ?
- the GSM ?
- SMSTools ?

Administrator
Registered:
May 2009
Location: Jyväskylä, Finland
It comes from the GSM 03.40, 9.2.3.6 TP-Message-Reference (TP-MR), which says:

"The reference number may possess values in the range 0 to 255."

Member
Registered:
Aug 2009
Location: Belgium
Topic owner
Ok thank you for the information.

I suppose it has nothing to do with message_id's, but could you tell me what is the "message reference" in the release note below ?

Quote
20.02.2007 3.0.5
.....
3. Internal combine can now handle 16-bit message reference numbers too.
....


Administrator
Registered:
May 2009
Location: Jyväskylä, Finland
Message_id is for sent messages only. The modem will choose it and store the last used value to the SIM. Next time this plus 1 is used as a value. If a status report is asked, smsd will save this value to the sent message file. Later when status report is received, it will contain this same number as a message_id.

"Message reference number" is for concatenated (multi part) messages. Smstools uses 8-bit values from 0 to 255 while creating concatenated message. This value identifies a message where the received part belongs to. For example, while receiving parts:

- ref 123 part 1 / 2
- ref 234 part 1 / 3
- ref 234 part 2 / 3
- ref 123 part 2 / 2
etc...

Some devices can use 16-bit reference numbers and after >= 3.0.5 smstools has been able to handle those incoming messages too.

Member
Registered:
Aug 2009
Location: Belgium
Topic owner
Thank you very much for your explanation.

It's clear for me now.

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