Knocking is read as a request for entry or attention. Tradition asks who was knocking, since it points to something that wants to be let into your life.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.