ModemManager - Access Technology vs ModemCapability

[Aleksandar Nikolic]

Hi all,

The device I am using has a Cinterion® EXS82-W built-in and I am noticing some weird behavior when it comes to Access Technologies and ModemCapatibiliy, IMHO it doesn't make sense, but I guess I am wrong somewhere and would like to know where.

Reading the AccessTechnologies property

busctl get-property org.freedesktop.ModemManager1 /org/freedesktop/ModemManager1/Modem/0 org.freedesktop.ModemManager1.Modem AccessTechnologies
u 16384


The value 16384 should correspond to MM_MODEM_ACCESS_TECHNOLOGY_LTE<https://github.com/linux-mobile-broadband/ModemManager/blob/1.18.8/include/ModemManager-enums.h#L236>.

Reading the SupportedCapabilities property

busctl get-property org.freedesktop.ModemManager1 /org/freedesktop/ModemManager1/Modem/0 org.freedesktop.ModemManager1.Modem SupportedCapabilities
au 1 4


The value should correspond to MM_MODEM_CAPABILITY_GSM_UMTS<https://github.com/linux-mobile-broadband/ModemManager/blob/1.18.8/include/ModemManager-enums.h#L52>.

Question

How can it be that my modem supports only GSM/UMTS from the general access technology families, but at the same time it is using the LTE technology when registered with or connected to a network?

Thanks and cheers.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/modemmanager-devel/attachments/20230621/542c0c36/attachment.htm>