Problem with UDP propagation?
Hi, 

I know for sure that this isn't an issue related with your plugin (that I really appreciate a lot so I also donated), but I hope that you have suggestions about this.

I run homebridge inside docker on a QNAP nas, network in host mode so no bridge. Everything worked perfectly until I had to change the home internet connection from copper to optic-fiber, so I had to change router, setting up a "Technicolor AGHP - DGA 4132".

Since then, the plugin hasn't been able to connect to the shellies anymore. If I visit the shelly's ip, I see the web interface and everything works. If I execute `shellies description <ip>` I see the output about my shelly, but nothing shows up with `shellies listen`.

I'm quite sure it is a problem with UDP broadcast propagation, but I looked all the router web       UI for some kind of option to tune about it, found nothing.

I also tried with wireshark, when I visit the web UI of the shellies I see traffic in response from them. When I press the buttons to turn on the light, no packet is sent on the network announcing the event.

Any hint? I'm rellay running out of ideas. Thanks
