IME, most consumer grade door locks want you to use their own apps; very few "smart locks" allow the user local API access. Some are decent but others are complete garbage- between sending your data to some obscure chinese server, to the chance they will go out of business and Apple will c...

This is possible using DIO. Here's a video that demonstrates using DIO to control a relay. I think he lists a link to a post that explains it. Either way there is plenty of info online to get you started. Google blueiris DIO arduino Certain hikvision cameras, for example, also have added functionali...