May 2020 - Bluetooth-dev - lists.apple.com

Re: Background CoreBluetooth
by Darren Jones via Bluetooth-dev 07 May '20

07 May '20

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=me.com; s=1a1hai; t=1588893909; bh=EMbr2oFTIC/y+H8zph9aj7SIsKFO0DIq6xR/8yIyYL4=; h=Content-Type:From:Subject:Date:Message-Id:To; b=keiVRtDqdjuDJCvs9vQ/hR02QVSALo0ZjoSF+oLUs5FHac6A3kgIR7FtT8/UmV/4d PhkL/UJswyqz1nxGTn6xIAhlQ9KFHjxz5VadjALbqFtvRynOvbEbdvb/i8c61D0UrN hebtCqbQGvesquefEffAaNOw98FA2EjWNSUKBkkR6Sn6ZA6L1e+7AQkfAvETwLMtS+ DpMvf4kU0bVa1hvdDqHkIvCBop8t0L3iqrwGclxnSIAyBmi5zUK2OqPucczMV8aqyJ NHKKdr7WB6t0HLNTE3ATXc3L/JeITDVzhCgIKXH2iCqdUc2PLNc4lLyAt4V3Ja1fqf UDTzTeAefQ7hA== Thanks for the write up. Your findings are pretty much the same as mine. I wonder how long the ‘keep alive’ can last. Possibly forever? If you are in a household with multiple iOS users that install the app, an initial connection could stay connected constantly while in range. I wonder what effect that would have on battery life. They’ve been very clever with the way Android can wake up iOS, so in a crowded area with many devices there’s a good chance the app will work. Walking to a local shop on your own and bumping into a few people, there’s a good chance it won’t. Sent from my iPhone > On 8 May 2020, at 00:09, Nick Brook <nrbrook(a)gmail.com> wrote: > > I’ve been playing around with this today, testing with my own code and > looking at the NHS App. > > The NHS App is doing nothing special, as far as I can see > It advertises a service, and in the background iOS puts the service in the > “overflow” (one-hot encoded) > Android looks for this specific one hot encoded value. Actually, it doesn’t > look for a specific bit set, but a fixed set of bytes, so if other Apps are > advertising services in the background on iOS the NHS App on Android might > fail to discover it. This seems like a bug, although I’m not sure if they > could work around it > It attempts to keep connections (and the process) alive for as long as > possible by sending “keep alive” data every 8s (under the 10s execution > window apple provides) > It is susceptible to the problems other Apps are (restarting the phone, > quitting the app etc can break scanning and discovery) but it helps to > overcome this through notifications to the user to reopen the app. > I’m not sure if Apple imposes a time limit on scanning for/advertising > services in the background although presumably there is a notification for > this in the NHS App if it does. > > > With the user notifications, if users actually respond to them it might work > well enough to be effective. But I could see users ignoring the notifications > if there are too many, and particular when out and about and busy these may > get ignored. If they are ignored, the App may not work for a long period of > time. > > It seems the UK government may be reconsidering the centralised approach now > anyway: > https://www.telegraph.co.uk/news/2020/05/06/nhs-explores-feasibility-moving… > > I’d be keen to hear any further insight into how the App is working or > background bluetooth can made to work better. > > Nick Brook > > NRB Tech > W: https://nrbtech.io > > >> On 7 May 2020, at 21:17, Darren Jones via Bluetooth-dev >> <bluetooth-dev(a)lists.apple.com> wrote: >> >> There is no location permission in the app. >> Which is a good job as the questions over privacy would explode more than >> they already have. >> >> Sent from my iPhone >> >>>> On 7 May 2020, at 21:14, Diego Alfarache <dalfarache(a)gmail.com> wrote: >>>> >>> >>> These apps are going to have background location permission, which >>> effectively gives them free reign to run almost anything in the background. >>> >>> >>> I created a framework for a client that would act as both a peripheral and >>> central while executing in the background, but only when they had “always” >>> location permission. >>> >>> Diego >>> >>> >>> >>> From: "Jan Lübeck via Bluetooth-dev (Fyrastudio)" >>> <bluetooth-dev(a)lists.apple.com> >>> Reply-To: "Jan Lübeck (Fyrastudio)" <jan(a)fyrastudio.com> >>> Date: Thursday, May 7, 2020 at 3:04 PM >>> To: Darren Jones <djonesuk(a)me.com> >>> Cc: <bluetooth-dev(a)lists.apple.com> >>> Subject: Re: Background CoreBluetooth >>> >>> Apple did announce that they are sharing their APIs with specific >>> developers. Maybe UK NHS is one of them? >>> ______ >>> Jan Lübeck >>> Chief Technology Officer >>> fyrastudio.com >>> >>> >>> On Thu, May 7, 2020 at 3:48 PM Darren Jones via Bluetooth-dev >>> <bluetooth-dev(a)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? >>> >>> Thanks >>> _______________________________________________ >>> Do not post admin requests to the list. They will be ignored. >>> Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) >>> Help/Unsubscribe/Update your Subscription: >>> https://lists.apple.com/mailman/options/bluetooth-dev/jan%40fyrastudio.com >>> >>> This email sent to jan(a)fyrastudio.com >>> _______________________________________________ Do not post admin requests >>> to the list. They will be ignored. Bluetooth-dev mailing list >>> (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: >>> https://lists.apple.com/mailman/options/bluetooth-dev/dalfarache%40gmail.com >>> This email sent to dalfarache(a)gmail.com >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/bluetooth-dev/nrbrook%40gmail.com >> >> This email sent to nrbrook(a)gmail.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Background CoreBluetooth
by Nick Brook via Bluetooth-dev 07 May '20

07 May '20

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=FkqGwId1E6MvbIQ7RKay1Kv8gvzYP4L8abD1zGa5Lto=; b=aG5GLjl3OVk4DN4lRbo3bM8J/aOtWQu7xDFn/Asyh187biqCd4k4Pj/NXcR+lfvGFa qo+S19qWNR/CvRavL/PLGXrfdnnpPe5HSvljIRxqYSE3rwajfZ0HV1QMZ7Rq6NAADuyR F2Nv+ubUUkA3yGR3tFf+/2qAODaPaOclylYnq8LbtQUBN4+00Qlrd+B8me49gpcSS7mp Ue2WCkT1kKvQuZFshSe5Btd0Z5IWqyq46GzBzww5wd+g6ri2PoJeMS8LCB226+eDNGVS /ziFC+s3xo3/qp+weBgS/6liBtq/6dZkp8dp4o1ntcwGngo/32i05bSzngK2nUF5n4ID IDcQ== I’ve been playing around with this today, testing with my own code and looking at the NHS App. The NHS App is doing nothing special, as far as I can see It advertises a service, and in the background iOS puts the service in the “overflow” (one-hot encoded <https://crownstone.rocks/2018/06/27/ios-advertisements-in-the-background>) Android looks for this specific one hot encoded value. Actually, it doesn’t look for a specific bit set, but a fixed set of bytes, so if other Apps are advertising services in the background on iOS the NHS App on Android might fail to discover it. This seems like a bug, although I’m not sure if they could work around it It attempts to keep connections (and the process) alive for as long as possible by sending “keep alive” data every 8s (under the 10s execution window apple provides) It is susceptible to the problems other Apps are (restarting the phone, quitting the app etc can break scanning and discovery) but it helps to overcome this through notifications to the user to reopen the app. I’m not sure if Apple imposes a time limit on scanning for/advertising services in the background although presumably there is a notification for this in the NHS App if it does. With the user notifications, if users actually respond to them it might work well enough to be effective. But I could see users ignoring the notifications if there are too many, and particular when out and about and busy these may get ignored. If they are ignored, the App may not work for a long period of time. It seems the UK government may be reconsidering the centralised approach now anyway: https://www.telegraph.co.uk/news/2020/05/06/nhs-explores-feasibility-moving… <https://www.telegraph.co.uk/news/2020/05/06/nhs-explores-feasibility-moving…> I’d be keen to hear any further insight into how the App is working or background bluetooth can made to work better. Nick Brook NRB Tech W: https://nrbtech.io <https://nrbtech.io/> > On 7 May 2020, at 21:17, Darren Jones via Bluetooth-dev > <bluetooth-dev(a)lists.apple.com> wrote: > > There is no location permission in the app. > Which is a good job as the questions over privacy would explode more than > they already have. > > Sent from my iPhone > >> On 7 May 2020, at 21:14, Diego Alfarache <dalfarache(a)gmail.com> wrote: >> >> >> These apps are going to have background location permission, which >> effectively gives them free reign to run almost anything in the background. >> >> I created a framework for a client that would act as both a peripheral and >> central while executing in the background, but only when they had “always” >> location permission. >> >> Diego >> >> >> >> From: "Jan Lübeck via Bluetooth-dev (Fyrastudio)" >> <bluetooth-dev(a)lists.apple.com> >> Reply-To: "Jan Lübeck (Fyrastudio)" <jan(a)fyrastudio.com> >> Date: Thursday, May 7, 2020 at 3:04 PM >> To: Darren Jones <djonesuk(a)me.com> >> Cc: <bluetooth-dev(a)lists.apple.com> >> Subject: Re: Background CoreBluetooth >> >> Apple did announce that they are sharing their APIs with specific >> developers. Maybe UK NHS is one of them? >> ______ >> Jan Lübeck >> Chief Technology Officer >> fyrastudio.com <http://fyrastudio.com/> >> >> >> On Thu, May 7, 2020 at 3:48 PM Darren Jones via Bluetooth-dev >> <bluetooth-dev(a)lists.apple.com <mailto: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? >> >> Thanks >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com >> <mailto:Bluetooth-dev@lists.apple.com>) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/bluetooth-dev/jan%40fyrastudio.com >> <https://lists.apple.com/mailman/options/bluetooth-dev/jan%40fyrastudio.com> >> >> This email sent to jan(a)fyrastudio.com <mailto:jan@fyrastudio.com> >> _______________________________________________ Do not post admin requests >> to the list. They will be ignored. Bluetooth-dev mailing list >> (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/bluetooth-dev/dalfarache%40gmail.com >> This email sent to dalfarache(a)gmail.com > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/bluetooth-dev/nrbrook%40gmail.com > > This email sent to nrbrook(a)gmail.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Background CoreBluetooth
by Darren Jones via Bluetooth-dev 07 May '20

07 May '20

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=me.com; s=1a1hai; t=1588882659; bh=egSTXUm4FCx3dTFdJM+eyJHas+XeuSYaFaaq9a8AGBA=; h=Content-Type:From:Subject:Date:Message-Id:To; b=YMVv+YFa3EYXy1AAHep3FOu4oCJcvYlPAdTCvPGfIjmv7aIhgQg7QSatgh7vUkTOt eGDOwjHd33p0a4+rxngGJhZlFjq+r6OObyi5v602WVhf3b2VOpHa7IH2jPt407MmQW eAT6gpTLINzICYb5U9qKUByJcdsJd8mDVWM+Fs6O8rN4T8eRatFyBZzIfIeptbvn7g vlUZOCbBXBSuhGioaDnrR9NG0qHVqXrx9aHQJBLc4pp2oEtgL0uXwBEHZdF3v3jdub uRVWp3xZKhyZh39aRaZIyZb/xV3jZW9DUd0+Pz2IgBt38CSZ1fjOJuNgPw6bSiSy4B oEsGffRgm/2AA== There is no location permission in the app. Which is a good job as the questions over privacy would explode more than they already have. Sent from my iPhone > On 7 May 2020, at 21:14, Diego Alfarache <dalfarache(a)gmail.com> wrote: > > > These apps are going to have background location permission, which > effectively gives them free reign to run almost anything in the background. > > I created a framework for a client that would act as both a peripheral and > central while executing in the background, but only when they had “always” > location permission. > > Diego > > > > From: "Jan Lübeck via Bluetooth-dev (Fyrastudio)" > <bluetooth-dev(a)lists.apple.com> > Reply-To: "Jan Lübeck (Fyrastudio)" <jan(a)fyrastudio.com> > Date: Thursday, May 7, 2020 at 3:04 PM > To: Darren Jones <djonesuk(a)me.com> > Cc: <bluetooth-dev(a)lists.apple.com> > Subject: Re: Background CoreBluetooth > > Apple did announce that they are sharing their APIs with specific developers. > Maybe UK NHS is one of them? > ______ > Jan Lübeck > Chief Technology Officer > fyrastudio.com > > > On Thu, May 7, 2020 at 3:48 PM Darren Jones via Bluetooth-dev > <bluetooth-dev(a)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? > > Thanks > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/bluetooth-dev/jan%40fyrastudio.com > > This email sent to jan(a)fyrastudio.com > _______________________________________________ Do not post admin requests to > the list. They will be ignored. Bluetooth-dev mailing list > (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/bluetooth-dev/dalfarache%40gmail.com > This email sent to dalfarache(a)gmail.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Background CoreBluetooth
by Diego Alfarache via Bluetooth-dev 07 May '20

07 May '20

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=user-agent:date:subject:from:to:cc:message-id:thread-topic :references:in-reply-to:mime-version; bh=FW+OKpWYaQzHQV1g1k1bJDTsTEqQ1Be1BQ69nRqvwsE=; b=VrfI+1Q7GIfKQ7h3bH/IJWHs167x/npyzCwhdSVa8RqDFMJD+VS6b8nnW4EIzJ1ZfH HNATwXi+AR3yozAvs16cb0i/RYd1iJSZyMS92JD7T+9fq6l7/w+SXLOlMD+PpSIJXDcN xv5Hri4Q9WbZyatmwvnKTbjmNyjvLlCWO9yxOkugg397ob3OGi48huKcl2KPcxRDC5YO Oe4oenbeMRl455S3yFSIJe+boffN2s5wYh1CAny8AXR55uPrGp3u9Xs8Rr1sY5O4CSsj RqOEPY+CJY5bWgPXYFRb8LuzeVxXmUyVTyzYc27K+7uvvhpcYiHRq9taaGTpu+vsCNSH FoOA== Thread-topic: Background CoreBluetooth User-agent: Microsoft-MacOutlook/16.36.20041300 These apps are going to have background location permission, which effectively gives them free reign to run almost anything in the background. I created a framework for a client that would act as both a peripheral and central while executing in the background, but only when they had “always” location permission. Diego From: "Jan Lübeck via Bluetooth-dev (Fyrastudio)" <bluetooth-dev(a)lists.apple.com> Reply-To: "Jan Lübeck (Fyrastudio)" <jan(a)fyrastudio.com> Date: Thursday, May 7, 2020 at 3:04 PM To: Darren Jones <djonesuk(a)me.com> Cc: <bluetooth-dev(a)lists.apple.com> Subject: Re: Background CoreBluetooth Apple did announce that they are sharing their APIs with specific developers. Maybe UK NHS is one of them? ______ Jan Lübeck Chief Technology Officer fyrastudio.com On Thu, May 7, 2020 at 3:48 PM Darren Jones via Bluetooth-dev <bluetooth-dev(a)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? Thanks _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/jan%40fyrastudio.com This email sent to jan(a)fyrastudio.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/dalfarache%40gmail.com This email sent to dalfarache(a)gmail.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Background CoreBluetooth
by Darren Jones via Bluetooth-dev 07 May '20

07 May '20

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=me.com; s=1a1hai; t=1588882041; bh=0TBIs8Aug3S1xzlL+MtYklzdW8caLUYZ6t4l28UPLyU=; h=Content-Type:From:Subject:Date:Message-Id:To; b=0ixOBF//MUCUHHshohkvVnq5xeV4MKdj7zpBBoakMk0TMmaoLc7sHioxFPOoAEpAH tX7YG9a3zCPPwOzppW1pqdVk10yVPFfEqBh+PToFu+2gnDX886cUAKhZmE7+wIj89g z+bpS6Mz1pQ8A5BWxSncgD6X/fBtnDIJlP8uZzJuuNWDLwE2yNtCKsuWd3SRmSzKh4 MnJuKmNCogYocWbg1VY0LuDy/AQUep94JoW7rWq6DjG5bEKQ1THdnQ+kaAmfofnE/V FnQZMV3oYB4axelj/WZluJ/zlKF6Hi9/JXLitoiP062GOTSAKtICf5pUrgOPvGz2bx 4rt2a7P4QUwag== Apple have confirmed that the NHS app has no special privileges. The source code has been released and looks the same as any Bluetooth app I’ve made. Sent from my iPhone > On 7 May 2020, at 21:04, Jan Lübeck (Fyrastudio) <jan(a)fyrastudio.com> wrote: > > > Apple did announce that they are sharing their APIs with specific developers. > Maybe UK NHS is one of them? > ______ > Jan Lübeck > Chief Technology Officer > fyrastudio.com > > >> On Thu, May 7, 2020 at 3:48 PM Darren Jones via Bluetooth-dev >> <bluetooth-dev(a)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? >> >> Thanks >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/bluetooth-dev/jan%40fyrastudio.com >> >> This email sent to jan(a)fyrastudio.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Background CoreBluetooth
by Jan Lübeck via Bluetooth-dev 07 May '20

07 May '20

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fyrastudio-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RGUkNMmvLWLYdmrQpFf7hUasB+CmIpKTYb/wHOgvsHk=; b=y+XFEBqC8JILFSO1z176jmBc4xmz4U/bhyOwrTOy4+xVhsi49maVlAqApH1UHyaagH iQ7xiO6g30IXW33LZVKbS/mJWhO93DIDSXPGWsfrfgk3zsG3gMRZTKfLxYQvxEaFvPBU CPY7jDHYY6jDMWu/HhXNJWggIC7vzGXd0RjVtRcXf0cGyK0tl0zoujAAF+hFHSet/o4S JPHUffEvL9MF4DACBtDnBBfDHaXzPeHjLrS7G70skX1XrI2kiUnn+lPl07YBPxOa1FQj IDQ6acoDElewiVVLSxLVwynbGwcM8hc9XyeT7Yz+xmwIus7Zk7D9id4CWxN16bmVOHOO caGg== Apple did announce that they are sharing their APIs with specific developers. Maybe UK NHS is one of them? *_____**_* Jan Lübeck Chief Technology Officer fyrastudio.com On Thu, May 7, 2020 at 3:48 PM Darren Jones via Bluetooth-dev < bluetooth-dev(a)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? > > Thanks > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/bluetooth-dev/jan%40fyrastudio.com > > This email sent to jan(a)fyrastudio.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Background CoreBluetooth
by Darren Jones via Bluetooth-dev 07 May '20

07 May '20

site_archiver(a)lists.apple.com Delivered-To: bluetooth-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=me.com; s=1a1hai; t=1588880926; bh=3R9LvZm6R+woTa6/jDjx0C2ld1O6IjBVo8U0qu2gtoE=; h=Content-Type:From:Date:Subject:Message-Id:To; b=YsJV5NEAO3dlSaq98Zdl8viWQibLv0jl3Vgj1FtBpjtul6OU283viPTnIC6dYBklm JtP46xMdw+OZCfexYcRPVy60EzJuYe6lSo2fLRTopreQwfbXdtvCs2x1LQNsQHOvPX x944PSmgyO6xOuPY/5wwb3y4Un2Z3/DHMy/nK3ESR/zaEbeegMca/sze7+YGOAKG6N RoBUYlVeaaBcvLsgitMjMXhNFOs5lXeHdExQWZ0RdUmR6q5wfh9fMZRUJBNKghR78z SkKinLcSKdVVTi4vu6ZcC7fi21fRQJBs24rVfss0J2lXQLXgJah49z5BNDlIlEveJr W9dYlIl9RzcJQ== 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? Thanks _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0