Nandi: the symbol of ultimate listening & receptivity

Prayer means you are trying to talk to God and Meditation means you are trying to listen to God. Nandi is the symbol of ultimate listening and receptivity . Is Nandi the gatekeeper of God Shiva? For details you may go through the following article https://lunarsecstacy.com/2022/01/21/nandi-enormous-bulls-in-front-of-the-shiva-temples-of-india/