Hello there,
You will first need to get the SSH keys working. Please follow the instructions here in this post How I got Asuswrt device tracker working with SSH key files
Once your SSH is set up correctly, try to access the router using your private key. For this I would recommend using the “SSH & Web Terminal” official addon using the below command:
ssh -i /config/ssh_keys/asus_router -o StrictHostKeyChecking=no [email protected]
Here 192.168.1.1 is your router’s IP.