Ryobi Garage Door opener

I think you are talking about the sensor to open the garage door, not the Wi-Fi connection between the device and router.

Correct.  Why else would you connect a garage door opener to a router?  You'd either open/close it via the transmitter included with the opener or an app on a phone.  Unless it also has cameras, there isn't much to check on a garage door opener.

or an app on a phone.

I think that is what OP is trying to set up but they can't get their garage door opener to connect to the internet(Wi-Fi) for the app to function.

It connects but doesn't stay connected.  As far as the frequency hopping, disregard, I suspect its NIC is probably sending an internal open/close command.

One way to test that theory is to try another device(phone?) in the same spot as the opener(with it turned off) and see if the problem occurs. If not, then it has to be something specific with the opener. I am guessing it's just weak signal.

I am sorry, but I find that to be funny. It doesn't have 10baseT backwards compatibility? I thought that 100BaseTX required that backwards compatibility as a part of it's implementation?

I am curious what model switch it is. Not that I am going to be buying a 1600$ switch any time soon. Heh.

Since you all asked:  https://dl.ui.com/ds/usw-enterprise-48-poe_ds.pdf

Given my experience from the Unifi management console, I suspect they dropped 10Base-T on all their switching equipment.  Documentation states 100Base-T/1G/2.5G/10G supported.

Interesting. I think you mentioned your switch before so sorry for asking you to repeat.

Can you use a dumb switch in-between the device and your switch to negotiate the connection? How did you solve the problem?

Yep, I suspected this might be the problem.  The device being only 10Mbps was known to me and the problem started when the new switch got swapped in.  I found one of my older GS series Netgear switches to put in the middle and I was able to get it to link.  GS must stand for good switch, who knows.

The firewall has 8 unused Ethernet ports that support 10/100/1000 so that was the solution but even that wasn't plug'n play.  The Chamberlain support literature says many routers are not compatible with their bridge due to the way they're internally wired.  Ultimately I had to think back to some of my prior networking kung fu and decided to make a crossover cable which made it compatible with my firewall.