<div dir="ltr"><div>You don't need a 100% success rate in the comms.</div><div><br></div><div>Unless someone is coughing straight in your face you need a reasonably long time in the location with an infected person - at least a few minutes - to pick up sufficient viral loads.</div><div><br></div><div>Any reasonable BLE system will be able to discover beacons within a few seconds. You only need to get a small % of beacons to achieve that.</div><div><br></div><div>Still, a cellphone based BLE app makes more sense - people don't leave their phones behind and they keep the battery charged.</div><div><br></div><div>The biggest hassle is still trying to roll out a million of these, keep the firmware up to date and all that.</div><div><br></div><div>Logistics kills many otherwise reasonable ideas.</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 25, 2021 at 11:36 AM Volker Kuhlmann <<a href="mailto:list57@top.geek.nz">list57@top.geek.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Mon 31 Aug 2020 12:57:06 NZST +1200, Charles Manning wrote:<br>
<br>
[...]<br>
<br>
<br>
There's more background info about the non-covidcard trial here,<br>
and a blurry photo of the PCB with the chips:<br>
<a href="https://www.stuff.co.nz/business/opinion-analysis/124015157/wed-be-getting-covidcards-now-if-ministers-made-different-decision-in-august" rel="noreferrer" target="_blank">https://www.stuff.co.nz/business/opinion-analysis/124015157/wed-be-getting-covidcards-now-if-ministers-made-different-decision-in-august</a><br>
<br>
The author says the card's engineer Dean Armstrong had all the answers<br>
asked of him. Hmm. Anyone interested to find out from either? But I have<br>
a feeling that the technology itself is unable to provide close to the<br>
100% success rate that would be desirable, ignoring all other usability<br>
issues.<br>
<br>
Volker<br>
<br>
-- <br>
Volker Kuhlmann<br>
<a href="http://volker.top.geek.nz/" rel="noreferrer" target="_blank">http://volker.top.geek.nz/</a> Please do not CC list postings to me.<br>
<br>
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