How to make ACS on Arduino?

Question

Arduino

I want to organize an access control system using RFID tags. The system should work like this:
An RFID tag is applied to the reader, a request with the ID of the tag goes to the remote server (there is already a server part). The answer can be positive or negative. Some indication of the result of the server's response must occur.
Can you please tell me what is the solution? Or any advice on the best way to do this?

Answer 1

Arduino + GSM module + RFID scanner + RGB LED + speaker.
The Arduino receives the tag data from the scanner and sends a request to the server. If the server answered positively, we light the LED green and beep with a long beep into the speaker. If the server answered negatively, we light it red and give it three short beeps.
How to work with GSM
How to work with RFID
If you need not only an indication of the server's response, but also the lock to open, then naturally we do this too, for example, through a relay and a solenoid.

Answer 2

Or any advice on the best way to do this?

It is better not to send a request to the server, but to store the database on an arduino, because if the connection is broken, the lock will stop working.