Hello, I'm looking for what I guess you'd call a "smart" padlock for the side gates. Basically what I'd like: I have someone coming to do some work out back. They arrive, knock at the front door. I have a remote or an app and I just push a button and the padlock unlocks, letting him in and when he leaves he just locks it behind him on the way out. I don't need or want half a dozen ways to open the lock, just the ability to unlock from a distance with a remote, like a garage door opener. No keypad or codes to punch in, no key or fob, no fingerprint reader.
Is there an effective, affordable option like what I'm describing available that anyone can suggest? Something that will hold up to the weather -- alot of them I've come across apparently die, stop working after a few months. Any suggestions much appreciated!