Does it need to be a button you press? If so, the app IFTTT can provide you a button on your phone screen that you can to send a request to an Alexa type device in the garage to do whatever.
But perhaps that is not the best approach. Have you considered a motion detector in front of the garage doing the same? If you don't have traffic in front of the garage, this might be a better option.
Relays always click. Some much louder than others. If these are for lights, get dimmers. They never click because they don't use mechanical solenoid relays.
Repeaters no the be always on.
Getting repeaters that you frequently turn on and off will make your network topology a mess. Traffic will always have to be finding new routes through the network depending on the combination of repeaters that are on and off at any one time.
You could also create the situation where certain parts of your network are only reachable when certain lights are on.
Repeater switches that are always on make sense. That is what I did.
Repeaters bulbs that could be powered off do not.
I don't think there are any products on the market to replace that setup as is.
You are going to have to cut the wall and double up (which would have bee the right way for the original installer to do this).
It is on the same circuit and throwing interference.
I have an audible thump out of my sub every time we flip the wall switch to the ceiling fan.
Is this possible?
Yes.
Will you have the same level of functionality and convenience? No.
Will it be easy? No.
There are tricks you can play with your firewall and other networking pieces to prevent devices from calling home. But those devices have to have local API's exposed so you can still control them.
Consumer HA companies rolled out WiFi cloud solutions because it was easy. Consumer could get started after buying just one device. Not need for a HUB and compatibility. Then they learned that cloud data can actually be pretty useful.
Hopefully Matter will cut into this mess. Part of the standard is that all devices should have local control and cloud access should be only for added functionality.
I'm slowly replacing my Control4 system with DIY.
The hardest part for me has been finding a good controller that is powerful but doesn't require you to make HA a second full-time job (looking at you Home Assistant).
I'm hoping Samsung will come out with a good Matter controller soon.
As long as you are not doing AV distribution, you can pretty easily replace everything C4 does with DIY hardware.
You want reliable? Forget WiFi.
Power is measured in amps or watts.
Maybe it is rated for a total of 15 Amps @ 5vdc total across all ports (which would be a really nice hub!). IF it shows the total power being consumed in real-time, that would be an awesome feature for some people.
The USB-A port is rated for 5vdc maximum and all USB-A devices are 5 volts. SO having a 15V hub would not make any sense.
USB-C can do higher.
Because the learning curve is too steep for somebody who doesn't see HA as their full-time hobby. They only want a completed project.
I'm software developer fluent in Linux. I have given up on Home Assistant. I'm back to SmartThings and Alexa waiting for a proper Matter controller to hit the market.
displays voltage.
You mean it confirms that the HUB has 5v like all USB hubs?
FYI - that is not a 3 gang. A 3 gang is a box wide enough for 3 standard decora switches. Those a 3 switches in a single gang.