Ok, so this is the question: I have an automated garage door. From the inside I can open it by just clicking a button on the wall which is actually just a doorbell wire that runs straight into the motor of the door. I would like to replace this button with something that can also be reached from Home Assistant. Ideally a button that can still be pressed, bypassing Home Assistant. I have a door sensor already to detect open or close (not halfway open, but I don’t need that (yet)).
Do you have a Z-Wave network connected to Home Assistant? If so, you could just keep your existing button and stick this behind it: https://www.fibaro.com/en/products/switches/
Thus, it will work both with Home Assistant and independently.
No z-wave unfortunately. I do have a xiaomi gateway, and (soon) a rfxtrx433e.
To open the door from the inside I have something like this: https://store.geniecompany.com/products/universal-push-button. It just needs to send a short pulse to the door opener…
(ps. no soldering or building stuff myself please, I have two left hands 
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You’re going to have a bit of a hard time finding something with the limitations you have to work with. You don’t have z wave so a z wave dry contact switch is out. you can’t solder or modify anything so using a modified sonoff switch is out.
try googling wireless relay or wireless dry contact and see if anything comes up that you can use.
Then just wire that in parallel to your existing push button switch.
If you are getting rfxtrx then a compatible wireless doorbell will work fine. You can listen for the press and set your automations accordingly.
I have mine as a doorbell but when pressed home assistant sends notifications, flashes my lights and pauses the tv if I’m watching it
Edit: Sorry missed the bit where you want it stand alone from home assistant. Dont think it will work without a lot more fiddling
Let me rephrase my question then: are there (doorbell) buttons that 1) connect the physical wire to the doorbell, but also 2) send/receive out any wifi or rf443 signal? That way 1) we can press the button on the wall, even when home assistant would be down or having connection issues, AND 2) I can call the “button press” from within home assistant (open the door for someone when I’m not home)
Do you have power nearby? You can use a sonoff or sonoff LV as dry contact relays that can be wired into the doorbell button.
Otherwise, if you have power in the ceiling (near the garage door opener), you can install it there and wire it into the same two inputs that the doorbell switch is wired to.
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