My question is summarized here:
https://stackoverflow.com/questions/47398018/hostapd-how-to-know-the-frequency-of-ap-mode
"On Linux, I'm using hostapd in AP mode. In other words, the system is
the hotspot.
I would like to know what is the frequency of the Wi-Fi via c code (or a
bash script that I could translate to c code).
The following code which queries the kernel, only works in normal mode.
It fails in AP mode.
ioctl(net_sock, SIOCGIWFREQ, &wrq);
In bash, I have tried:
iwconfig
iw dev
but it doesn't report the frequency of the Wi-Fi. Same problem: it only
reports in normal mode when the system associates to a router but
nothing in AP mode.
How can I query hostapd to know the frequency hostapd is using or is
configured to use?"
Grégoire
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