What is the current state of the law on "consensual encounters at the doorway of a home"?

"Consensual encounters may also take place at the doorway of a home.... 'Absent express orders from the person in possession against any possible trespass, there is no rule of private or public conduct which makes it illegal per se, or a condemned invasion of the person's right of privacy, for anyone openly and peaceably, at high noon, to walk up the steps and knock on the front door of any man's "castle" with the honest intent of asking questions of the occupant thereof - whether the questioner be a pollster, a salesman, or an officer of the law.' [Citation.] This view ' "has now become a firmly-rooted notion in Fourth Amendment jurisprudence." ' [Citation.]" (People v. Rivera, supra, 41 Cal.4th at p. 309.)