We have Cisco Catalyst 9800-CL Wireless Controller with 17.9.5 and trying to get Channel Bandwidth per client either SNMP or REST/YANG API as its shown in the WLC UI. We don't have success to find channel bandwidth value in either way.
/restconf/data/Cisco-IOS-XE-wireless-client-oper:client-oper-data
/restconf/data/Cisco-IOS-XE-wireless-access-point-oper:access-point-oper-data/
SNMP MIB examined: CISCO-LWAPP-DOT11-CLIENT-MIB, CISCO-LWAPP-AP-MIB