site_archiver@lists.apple.com Delivered-To: bluetooth-dev@lists.apple.com Dkim-signature: v=1; a=rsa-sha1; c=relaxed; d=rols.org; h=content-type :content-transfer-encoding:from:mime-version:subject:date :message-id:references:cc:in-reply-to:to; s=rols.org; bh=rHJ3R7S 5zhvEh2GoCs1RqQvCHH0=; b=nG6zn2DYJz4WMBjYrD9UGL4EyTK4Fq043mm48I2 lclYoD0vZINADQD7a4BBH4j0bp364cTJFz9PikaiqWi4Dh5Hmy/SIXWjON4aQp4B ctN0Fo3kdOfmpHmTjYLCqEv5dfNw4KqmfUNFfi/FZLjuAZH/CTbB2tYSKrF4Xxwm vP2E= No I don’t think it is possible. Eg the Singapore version of this “Trace Together” suffers from the same problem and the notes say if you’re using it on an iPhone please keep it as the active app and the phone as awake as much as you can. This makes it pretty useless. You can read the developer comments on the app in the App Store in reply to some negative reviews or here https://tracetogether.zendesk.com/hc/en-sg/articles/360044846854-Does-TraceT... I fully expect the NHS and I hope the team in Singapore which built “trace together” to move to the Apple/Google API when available as this will work consistently across platforms in the background like all other system level Bluetooth communications do.

On 8 May 2020, at 03:48, Darren Jones via Bluetooth-dev <bluetooth-dev@lists.apple.com> wrote:

Unless you have your head buried in the sand, I’m sure everyone has noticed the sagas going on with countries creating their own COVID-19 contact tracing apps.

I have personally tried many times over the years to create an app that can broadcast and scan in the background to trigger a ‘contact trace’ and always failed. Yet the UK NHS are claiming they have an app that does just that.

I’d love to hear from anyone that’s had experience with background BT. Is it possible? Can a background CBPeripheral be detected by a background CBCentral?

If not, is there a definitive time period when discovery becomes impossible?

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