Other (multi)controller Bluetooth device list affects Add Lamps list

[marirohtla]

Describe the bug A clear and concise description of what the bug is.

Setup that was used

• Lamps [e.g. 2x4ft Voyager, 3x2ft Voyager]
• OS: [e.g. iOS, OSX, Windows, Android]
• Router: [e.g. Ubiquiti, Voyager AP]
• External controller: [e.g. GrandMA]
• Versions: [e.g. Lamp firmware=1.31, UI=2.3.0]

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen.

Additional material

• Screenshots
• Files used in project
• Configuration files

Additional context Add any other context about the problem here.

[TaanielAI]

@marirohtla please check if this is the main cause of #630 .

[marirohtla]

@TaanielAI Yes, it seems to be one of the main causes indeed. If no other devices around have Bluetooth switched on: Lamps seem to appear much faster and more smoothly to the list, although usually still 8/10 or 9/10 lamps appear in the list..