| If you start advertising without duplicate filtering iOS warns if you are using the main queue in the device console. This is because disabling duplicate filtering can result in a lot of callbacks, and if you are doing some processing on each callback this could block the main queue. This would be a good occasion to use a different queue.
If you intended to be connecting to several devices simultaneously and interrogating them for lots of services and requesting data, that would be appropriate too.
It’s probably just a judgement call based on how you want to structure the App, responsiveness of the UI and analysis using Instruments.
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