Why no Internet? You are not going to get far with any connection method to a router that cannot connect to Blynk’s Cloud Server.
If you don’t have internet for the use of Blynk, then you will first need to install Local Blynk Server on some device that supports Java.
But now I see you have asked a similar question last year. Sorry, but the answers are the same. Checkout the link (links are in green) I provided for Local Server information.