The channels ‘supported’ via ‘iwlist’:
Channel 36 : 5.18 GHz
Channel 40 : 5.2 GHz
Channel 44 : 5.22 GHz
Channel 48 : 5.24 GHz
Channel 52 : 5.26 GHz
Channel 56 : 5.28 GHz
Channel 60 : 5.3 GHz
Channel 64 : 5.32 GHz
However, I can only set channels 36-48 using hostadp value. Any channel from 56-64 do not bring the interface up to be seen by a client. However there are no noticeable errors visible in logs (other than txpower setting error), and it appears to be up via ‘iwconfig’.
The AP is always brought up in AC/N mode even though AC mode is not added into our hostapd file.
Channels 36-48 are indoor only channels, and cannot be used outside in AP mode so we are stuck without a proper solution.