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I just got the ping about half an hour ago, looking at the settings on my phone, the timestamp is 13:14 (about 40 min ago), with 17686 keys, 1 match. Is that the exposure?
I think that is the time the database of infected phone ids was downloaded. Your phone then checks to see if it has seen any. The exposure you are getting a ping from was a few days ago as someone has to have a positive PCR and stick it in the app.
It could be a neighbour, bluetooth travels through walls.
jellybaby
How do the exposure notifications actually work? I just got the ping about half an hour ago, looking at the settings on my phone, the timestamp is 13:14 (about 40 min ago), with 17686 keys, 1 match. Is that the exposure? What time period is that from as I thought it was 15 minutes in close proximity to a positive case, and I've not spent 15 minutes with anyone but my wife or daughter in weeks. I've been to tesco, and driven my daughter to nursery. But even in Tesco, I would not have been close to the same person for more than a few seconds.
The timestamp was when I just happened to take my daughter out in the pushchair for a walk around the block to get her to sleep.