How can I modify the channel?

[chrissy-risk]

What is the law for channel modification? For example, I want to change to channel 2. What should the value be changed?

[matthiasseemoo]

here is the definition for chanspecs: https://github.com/seemoo-lab/nexmon/blob/master/patches/include/channels.h https://github.com/seemoo-lab/nexmon/blob/master/patches/include/channels.h

here is an example on how to use those macros: activate 20 MHz wide channel 7: set_chanspec(wlc, CH20MHZ_CHSPEC(7)); activate 40 MHz wide channel 7: set_chanspec(wlc, CH40MHZ_CHSPEC(7, WL_CHANSPEC_CTL_SB_L)); activate 80 MHz wide channel 7 (technically possible, though officially not specified): set_chanspec(wlc, CH80MHZ_CHSPEC(7, WL_CHANSPEC_CTL_SB_L));

All your channel specifications need to be accepted as valid chanspecs according to your regulations.c file that you can find in some of our projects in case you want to use non-standard channels.

On 11. May 2021, at 08:39, chrissy-risk @.***> wrote:

What is the law for channel modification? For example, I want to change to channel 2. What should the value be changed? https://user-images.githubusercontent.com/78351171/117769640-899b5980-b266-11eb-9660-deab05c2bc6c.png — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/seemoo-lab/mobisys2018_nexmon_software_defined_radio/issues/18, or unsubscribe https://github.com/notifications/unsubscribe-auth/ACZ773S7P46FLDRKUYQICU3TNDGIJANCNFSM44UPHFMA.

[IceNotCold]

Where can I excute the command "set_chanspec"? Linux or nexus?

[jlinktu]

set_chanspec is a function call. You want to put that in a patch file located in mobisys2018_nexmon_software_defined_radio/src. For example, you may want to add another IOCTL case here.