How to install ttyUSB from option.c

I want to connect a cellular modem to an USB port of a physical server with Rocky 8.8.
I can download the Linux driver files from MTCM2-L4G1-B03-KIT.
But I do not have the source from Rocky 8.8 to do all this stuff, described in the PDF which is in the Linux-drivers-ZIP-file.
The directory /usr/src/kernels/ is empty.
And /usr/lib/modules/4.18.0-477.13.1.el8_8.x86_64/build is just a link to the non-existing
How to install drivers without the source?

You generally need the kernel sources to build a driver. You need to install the kernel-devel package to get the kernel sources.

sorry, the solution was much easier!
I had to stop ModemManager!
Now smsd can communicate with the Modem over AT-commands.

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