Bahadir Birden

Hi, I use a Keenetic Hero 4G+ and my internet access is via a 4G data SIM card. I can view messages sent to my SIM card from the Keenetic interface and send messages to anyone I choose. I want to grant timed access to my home via the guest network using the Captive Portal. Looking at the Captive Portal options, I see this isn't my most basic need. If I can send SMS messages from the device, why isn't there an internal Captive Portal option? If there was an internal portal feature, and 1) the guest receives a form when logins to guest open network. 2) The form would include their first name, last name, phone number, and email address. 3) after the request is received,I could accept or reject this request (by selecting the duration) through the Keenetic OS. 4)The temporary access password is sent to the guest via SMS or email. With all the necessary capabilities, why don't Keenetic devices have an internal Captive Portal application? How could keenetic, who thought of everything, not have done this?