Storage behaviour when sending SMS

[Ulrich Mohr]

Hey,

while trying to resolve the issue when sending SMS with specific mbim 
modems 
(https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/562), 
I see different behaviour when sending SMS depending on the modem I use:

  * When I send an SMS using a non-MBIM modem (UBlox Toby L210, RNDIS),
    the SMS is shown (using mmcli) as sent. When I then restart
    ModemManager, the SMS is no longer there. So it seems that the
    message is not stored in SIM or modem.
  * When I send an SMS using my MBIM modem (Telit LE910C1-EU), the SMS
    is shown (using mmcli) as sent. When I then restart ModemManager,
    the SMS is still there. So it seems that the message is stored
    immediately when sending (to be precise: Any attempt to send the SMS
    creates an entry in the SMS storage on this modem -- so when I have
    three attempts to send an SMS, two failed and the third succeeded, I
    have two drafts and on sent message in the storage (!?) )

Is ModemManager capable to handle both of these scenarios? It seems to 
me that ModemManager does not expect the second scenario, which leads to 
the issue when deleting messages...

(BTW: In both cases, ModemManager crashes when I try to store the 
message using mmcli after it has been sent).


-- 
Best regards / Mit freundlichen Grüßen / Salutations distinguées

Ulrich Mohr

SEMEX-EngCon GmbH
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Phone: +49 (0) 7243 5143596
email:u.mohr at semex-engcon.com
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