AW: text mode SMS

Ralf Glaser glaser at
Wed Nov 10 09:38:13 UTC 2021

Hi Alexsander,

the issue is not the SMS representation during transport but the representation for the recipient. Our business is M2M communication and we see older systems that require text mode SMS. As our gateway is not meant to support a variety of use-cases disabling PDU mode SMS in general is not really an option.
I expect we will just send the SMS by AT commands directly in this case.

Best regards,

Von: Aleksander Morgado <aleksander at>
Gesendet: Mittwoch, 10. November 2021 09:24
An: Ralf Glaser <glaser at>
Cc: modemmanager-devel at <modemmanager-devel at>
Betreff: Re: text mode SMS

Hey Ralf,

> as far as i understand adding a udev tag would basically remove the PDU SMS capability from a specific modem.
> Wouldn't it make more sense to add an option to mmcli like --smsmode=<text/pdu> which would default to <pdu>?

I don't see it as a property of the SMS message, because if I
understand it correctly, the message will anyway be encoded as a PDU
by the time it hits the radio network (so the text to PDU conversion
is done by the modem itself, not by ModemManager). That's why I
suggested a udev tag, because this is a manual workaround to apply on
specific setups. Maybe your issue is not related to the mode used when
sending the SMS with AT commands, and is more related to how the SMS
PDU is being built by MM (e.g. encoding used and such).

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