Hello,
Unfortunately, there is no way to differentiate data consumption for SSIDs if they are bridged to LAN networks, nor to control it.
If each wireless network has its own interface, you can view received/transmitted data i Network -> Interfaces section, next to wireless interface or in interface details via SSH with the command:
- ifconfig <wireless_interface_name>
As an alternative, you could use Hotspot functionality to set limits for configured user groups, as described here.
Best regards,
