Cwa-app-ios: ENF shared two possible Encounters, but only one is shown in iOS App
Avoid duplicates
- [x] Bug is not mentioned in the FAQ
- [x] Bug is not already reported in another issue
Describe the bug
On 03.08.2020 the iOS App started to show me 1 possible risk encounter (low).
Today, I received a notification from ENF that 2 possible encounters have been shared with the App, but the App still shows 1 Encounter. I am checke the App every 24 hours for manual update, so I would not have missed a second possible encounter.
I double checked all "Begenungsüberprüfungen" protocols and I can only find 1 possible Encounter as it is shown in the App.
Any idea what happend to the second encounter and why is it not shown in the iOS App?
Expected behaviour
Number of possible encounters from Notifications from ENF and in iOS App match.
Steps to reproduce the issue
Technical details
- iOS Version: 13.6
- Device: iPhone 11 Pro
Possible Fix
-
Additional context
-
svenkubiak
All 79 comments
This should be related to this point in the FAQ.
You had _contact_ to two people who where tested positive for COVID-19, but with only one of the two you had _contact_ for longer then 10 minutes or/and you were closer than 8 meters.
Ein-Tim
on 5 Aug 2020
I double checked all "Begenungsüberprüfungen" protocols and I can only find 1 possible Encounter as it is shown in the App.
Do you mean you went to Settings and checked it there (Privacy->Health...)?
Ein-Tim
on 5 Aug 2020
You had contact to two people who where tested positive for COVID-19, but with only one of the two you had contact for longer then 10 minutes or/and you were closer than 8 meters.
@Ein-Tim No: if he had contact with one of them for more than 10 min & closer than 8 m, the app would not show a "green/low" risk status, but rather a red one, so both encounters (if there were actually two) must have been low risk
The weird thing is that iOS thinks that it had 2 encounters, while CWA only shows one.
daimpi
on 6 Aug 2020
I double checked all "Begenungsüberprüfungen" protocols and I can only find 1 possible Encounter as it is shown in the App.
Do you mean you went to Settings and checked it there (Privacy->Health...)?
Yes. Did an export as well.
svenkubiak
on 6 Aug 2020
@Ein-Tim No: if he had contact with one of them for more than 10 min & closer than 8 m, the app would not show a "green/low" risk status, but rather a red one, so both encounters (if there were actually two) must have been low risk
You're absolutely right, my fault.
The weird thing is that iOS thinks that it had 2 encounters, while CWA only shows one.
Yes, that has to be investigated.
Ein-Tim
on 6 Aug 2020
@daimpi
If @svenkubiak checked all protocols in the settings and found only one Encounter, the App shows the right number of possible Encounters, or not?
And that Apples Push Notification showed 2 Encounters is an issue/bug from iOS and not from CWA...
Correct me if I'm wrong
Ein-Tim
on 6 Aug 2020
Other Possible reasons:
Two contacts to the same key
One contact is more than 14 days old now
Bug in Protocol
Tho-Mat
on 6 Aug 2020
One contact is more than 14 days old now
I also thought about that before, but the Push Notification says "Wöchentliches Update" so my understanding is that both (if there were 2) contacts, happened in the last 7 days.
Ein-Tim
on 6 Aug 2020
For reference, this is the protocol export matching one encounter (starting 03.08.) which results as one low risk encounter in the app.
ExposureChecks-2020-08-05.json.zip
If @svenkubiak checked all protocols in the settings and found only one Encounter, the App shows the right number of possible Encounters, or not?
Protocol and App match. Yes.
svenkubiak
on 6 Aug 2020
The message does not say the contacts happen in the last 7 days. It says it founds 2 contacts in the last 7 days. That is something different.
If a infected user publishes his keys, he publishes 1 to 13 keys (yesterday to 14 days ago).
So if 2 contacts were found in the last 7 days it could be they happened 20 days ago.
Tho-Mat
on 6 Aug 2020
I assume the weekly report sums up every MatchCount in the ExposureChecks JSON of the last 7 days until the weekly report is created. Because this is the sum of matches the API response to the App requests. The API cannot say which matchcounts are the same maybe this is the reason why they sum up every MatchCount. But there is no official documentation from Apple side.
This means the MatchCount in the JSON and in the App are the same.
thomasaugsten
on 6 Aug 2020
I assume the weekly report sums up every MatchCount in the ExposureChecks JSON of the last 7 days until the weekly report is created.
Then the iOS notification should have said 3 and not 2, because at the time I received the push notification the sum of every MatchCount was 3.
svenkubiak
on 6 Aug 2020
Due to a bug in the protocol you only have the last 100 checks. For full Protocol you should have ~14*14=196 entries. So there may be missing some days entries. Hopefully the app gets its values from ios and not from the protocol.
That has to be checked.
Tho-Mat
on 6 Aug 2020
@svenkubiak
No. 3 times the same hash file value. So only one contact
Tho-Mat
on 6 Aug 2020
@svenkubiak The questions is when the weekly reports exactly appears or calculated on 04.08 or 05.08. I saw other JSON where it exactly fits thats why I was developing the theory. Unfortunately there is not hint in the apple source code regarding this weekly report.
thomasaugsten
on 6 Aug 2020
@thomasaugsten Notification was displayed at 05.08. around 19:45 if that helps.
svenkubiak
on 6 Aug 2020
@svenkubiak I think they sum the matchCounts for the weekly report then from 04.08.20 23:59:59 - 7 days
And this results in a sum of 2.
thomasaugsten
on 6 Aug 2020
@thomasaugsten Very confusing, but yes, that sounds like a likely reason.
svenkubiak
on 6 Aug 2020
@svenkubiak
So next week you must get at least a 7 contacts.
The date with the match is the file 2020-08-02.
You received that 2020-08-03.
The file was checked at 03,04 =>2
The file will be checked every day.
So if the theory is true next week it should say 7
Tho-Mat
on 6 Aug 2020
There may be other users that can confirm that
Tho-Mat
on 6 Aug 2020
@svenkubiak
So next week you must get at least a 7 contacts.
The date with the match is the file 2020-08-02.
You received that 2020-08-03.
The file was checked at 03,04 =>2
The file will be checked every day.
So if the theory is true next week it should say 7
Yes. Current assumption. Let's see.
Thanks all 👍
svenkubiak
on 6 Aug 2020
To quickly: it could be the key is older, so no match tomorrow or....
Tho-Mat
on 6 Aug 2020
@svenkubiak
Please export the protocol daily It may help
Tho-Mat
on 6 Aug 2020
Hello @svenkubiak,
since the app works correctly, added the label "on hold" to your issue-report.
Please try to keep watching it so that we know what the next weekly report of Apple is displaying.
Thanks,
LMM
Corona-Warn-App Open Source Team
GPclips-zz
on 6 Aug 2020
Hi @svenkubiak,
This is a known issue, but we also double checked your exposure log file.
There is only one exposure entry found.
{
"Hash" : "A7397D370364D7161218210E99EEAC01036894CEE5552C5D92BE644C33D3A0DD",
"RandomIDCount" : 1385,
"MatchCount" : 1,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-05 09:58:58 +0200"
},
iOS takes also duplicate key into account. cc @thomasaugsten
haosap
on 6 Aug 2020
@haosap
But this expose entry :hash + matchcount=1
appears 3 times in svenkubiak ‘s log
You easily will find the other 2:
{
"Hash" : "A7397D370364D7161218210E99EEAC01036894CEE5552C5D92BE644C33D3A0DD",
"RandomIDCount" : 1385,
"MatchCount" : 1,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-04 09:05:17 +0200"
},
0200"
},
{
"Hash" : "A7397D370364D7161218210E99EEAC01036894CEE5552C5D92BE644C33D3A0DD",
"RandomIDCount" : 1385,
"MatchCount" : 1,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 07:39:53 +0200"
},
Tho-Mat
on 6 Aug 2020
@GPclips
“ since the app works correctly, ”
Can you surely say this at the moment?
Tho-Mat
on 6 Aug 2020
Hi @Tho-Mat,
thanks for asking your question. With the Corona-Warn App, we call the Exposure Notification API from Apple, if using the iOS app. The application shows the exact results we receive from that service and therefore the displayed result is correct. The app works fine. This looks like a bug in the weekly report of apple and therefore we have added the Apple label to this thread. We are in contact with Apple to inform them about this issue.
Thanks,
LMM
Corona-Warn-App Open Source Team
GPclips-zz
on 7 Aug 2020
Short update while I am storing daily protocols and waiting for the next ENF Notification from iOS.
The iOS Corona Warn App went back to 0 (low) Encounters today, after showing 1 (low) Encounter for 5 days.
What looks odd to me is that based on the Protocol the same key set resulted in 1 Encounter yesterday, while it resulted in 0 Encounter today.
I would have expecteded that this happends after 14 days when the key set is not in Today-14.
Can someone explain that?
svenkubiak
on 8 Aug 2020
A first guess without looking deep into it this is because the collected RPIs are deleted by Apple after 14days from your device which are used to match with the key files.
thomasaugsten
on 8 Aug 2020
@thomasaugsten
Makes sense. Thanks.
svenkubiak
on 8 Aug 2020
Only somewhat related: If you swipe away the iOS Notifications, can you later on still retrieve them? Is there a log and if so, where can you find it?
I'm asking for someone on Twitter for whom the iOS notification seemingly showed 6 encounters, while the App itself remained at 0: https://twitter.com/plushy_cat/status/1292428044045635584
daimpi
on 9 Aug 2020
Only somewhat related: If you swipe away the iOS Notifications, can you later on still retrieve them? Is there a log and if so, where can you find it?
No, to the best of my knowledge it isn't possible to retrieve the Notification after you either
- clicked on it or
- swiped it away.
Ein-Tim
on 9 Aug 2020
@daimpi
Yub, was looking foe that myself. Didn‘t found a way to get the notification back nor found a „log“ of it.
svenkubiak
on 9 Aug 2020
@daimpi No you cannot.
Then she had very likely 1 low risk exposure the last 6 days. Now this risk exposure is to old that why it is not visible in the app anymore. Nothing to be concerned
thomasaugsten
on 9 Aug 2020
Thanks for all the feedback :)
Ok, just to make sure I got the scenario right: so basically she would have had a risk encounter 14 days ago, who uploaded their keys 7 days ago. Then for the last 6 days CWA would have shown one low risk encounter each day, which would be reset to 0 today. Apple just adds those up and then shows "6 encounters". Did I miss anything?
I also told her that she has nothing to worry about, but I'll ask her whether she checked her CWA in the last few days :)
daimpi
on 9 Aug 2020
@daimpi
That Apple is summing up is the current assumptiom (afaik), but yes, looks like the scenario.
svenkubiak
on 9 Aug 2020
Ok, I got feedback from the user: she said she checked CWA every day and always had 0 risk-encounters: https://twitter.com/plushy_cat/status/1292444970213879809
So I've no clue what's going on, despite Apple having a messed up ENF notification system 🤷
daimpi
on 9 Aug 2020
Then the exported Json from Begegnungsüberprüfungen exportieren in Begegnungsüberprüfungen would
Be helpful if there was really 0 matchcount
thomasaugsten
on 9 Aug 2020
I'll ask her, or if you want you could also chime in directly on twitter :)
As I'm not an iOS user: what are the steps to do such an export?
daimpi
on 9 Aug 2020
As I'm not an iOS user: what are the steps to do such an export?
(In German):
Einstellungen->Datenschutz->Health->
COVID-19-Begegnungsaufzeichnungen->
Begegnungsüberprüfungen->
[ganz nach unten Scrollen]-> Begegnungsüberprüfungen exportieren
Dann sollte das "Teilen"-Menü auftauchen und eine App zum Teilen der Datei kann ausgewählt werden.
Ein-Tim
on 9 Aug 2020
Ok, she send me her Exposure log:
ExposureChecks-2020-08-09.zip
(The Android logs I'm used to have a different format, if anyone has a quick pointer on how to import the iOS ones into Excel lemme know 🙂 )
daimpi
on 9 Aug 2020
The json logs match what the user said there was no risk exposure in the app.
Maybe the user misread the 0 in the weekly report for a 6. But we a working on this to understand the weekly report better.
thomasaugsten
on 9 Aug 2020
As @Tho-Mat requested requested in https://github.com/corona-warn-app/cwa-wishlist/issues/148#issuecomment-670852978, here is my exposure log. I get a green "low risk" view, but with "1 exposure". I did not get a notification at all. Also, i have not received a weekly report (yet).
Screenshot:
Exposure Checks exported from IOS:
{
"Build" : "17F80",
"ExportVersion" : 1,
"ExposureChecks" : [
{
"Hash" : "29D6D1D12B665615AAB90FCAAE7381A7BEC5C94B486C4C1DB2B58187709D9F73",
"RandomIDCount" : 740,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-02 16:53:44 +0200"
},
{
"Hash" : "D06F689AFB6B040F5022CA22CB468AE4D0E3A1CA96F1638271270C85BBB52448",
"RandomIDCount" : 825,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-02 16:53:44 +0200"
},
{
"Hash" : "681D0BB41E33C3659E6528ABE9736371800569FEAD906B68FB86175CFBDEA65F",
"RandomIDCount" : 595,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-02 16:53:44 +0200"
},
{
"Hash" : "75432F9AC4F9795D55C0CFE8792372BB8C439A81B36E2C67592ED3E84941B842",
"RandomIDCount" : 1790,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-02 16:53:44 +0200"
},
{
"Hash" : "742B557CC3340276581CDA249BF32974DA216A73608A93C7CA71AF6780DEDBB1",
"RandomIDCount" : 2290,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-02 16:53:44 +0200"
},
{
"Hash" : "F090F7EB8B51D96064C8D04267B0F4DD251884BA88E2F602758A3713C597BA36",
"RandomIDCount" : 2520,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-02 16:53:44 +0200"
},
{
"Hash" : "21C9FF4B16973C0C9D48A8DB37D728014F41827FE745511E01FAE683589CDFFE",
"RandomIDCount" : 1575,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-02 16:53:44 +0200"
},
{
"Hash" : "56AF64D46D311333B8CEE0430A0B7EF87CA04FC4369AA719674F7BDBFE8C30AA",
"RandomIDCount" : 1405,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-02 16:53:44 +0200"
},
{
"Hash" : "4CDEABF45B7CB9B55EA8CA8C0AE7197DEFBD71DCCA517B590D1FAACD537449C2",
"RandomIDCount" : 835,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
{
"Hash" : "895F811A97D2312D73BBD145E33AF01202A2B10AC9DCD7173952D16CAC50E748",
"RandomIDCount" : 720,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
{
"Hash" : "E5448879D9BE533290587D1177E3A2E64DF06C7CD785B17E5D8FE3769DBE0B0B",
"RandomIDCount" : 1375,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
{
"Hash" : "C6A03D8F5C9489D5A8E3D07ECB333EBB3E753759B81887787BD1EB8C8193FB25",
"RandomIDCount" : 1140,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
{
"Hash" : "29D6D1D12B665615AAB90FCAAE7381A7BEC5C94B486C4C1DB2B58187709D9F73",
"RandomIDCount" : 740,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
{
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"RandomIDCount" : 825,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
{
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"RandomIDCount" : 595,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
{
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"RandomIDCount" : 1790,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
{
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"DataSource" : "de.rki.coronawarnapp",
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"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
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"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
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"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
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"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-03 17:06:37 +0200"
},
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{
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"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
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},
{
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"DataSource" : "de.rki.coronawarnapp",
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{
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"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
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{
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"DataSource" : "de.rki.coronawarnapp",
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"DataSource" : "de.rki.coronawarnapp",
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"Timestamp" : "2020-08-04 18:54:49 +0200"
},
{
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"RandomIDCount" : 1385,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-04 18:54:49 +0200"
},
{
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"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-04 18:54:49 +0200"
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{
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},
{
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"RandomIDCount" : 1375,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-05 19:26:19 +0200"
},
{
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"RandomIDCount" : 1140,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-05 19:26:19 +0200"
},
{
"Hash" : "29D6D1D12B665615AAB90FCAAE7381A7BEC5C94B486C4C1DB2B58187709D9F73",
"RandomIDCount" : 740,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-05 19:26:19 +0200"
},
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],
"DeviceProductType" : "iPhone12,5"
}
I noticed, that the Check with the "MatchCount": 1 and "RandomIDCount" : 2415 repeats daily (When loading the lates checks), but moves down in the array. Am I assuming correctly, that the array is ordered and each entry corresponds to the collected IDs for a certain day?
I also want to point out, that the entry with a match was logged as the first position of the array at the day, where it first occurred. Does that mean, that the encouter with the COVID-19 positive person happened at the same day, where this person entered his positive test result? Seems relatively unlikely to me, doesn't it?
FelixKuehl
on 10 Aug 2020
@FelixKuehl The fact that the match occurred with the entry with "RandomIDCount" : 2415 can only be used to check when the package containing the key you matched with was first created on the server. If we compare that number with the "Distributed diagnosis keys per day" from here we find that the package containing the key you matched with was the one created by the server for the 05.08.2020. This means the person you had contact with uploaded their keys on that day, and you can download them the following day (06.08.20). This also matches with your log, as the first time a match appears is timestamped "2020-08-06 20:21:37 +0200".
As they always upload their keys from the last 14 days, you might have had contact with this person on any of the 14 days prior to 05.08.20 (although it can't be too far back, otherwise the 1 Risk-encounter in CWA would already have disappeared, which happens as soon as the encounter is more than 14 days in the past from now).
daimpi
on 10 Aug 2020
Thanks for the clarification @daimpi . Meeting someone the same day, they upload their key seemed really unlikely to me. This makes a lot more sense now. The date, when the contact happened could then only be calculated by monitoring, when the message disappears given the 14 day limit, correct?
FelixKuehl
on 10 Aug 2020
The date, when the contact happened could then only be calculated by monitoring, when the message disappears given the 14 day limit, correct?
Yes, that's unfortunately the only way I would currently know how to do this with a "low/green" risk encounter. Improvement is being worked on though:
daimpi
on 10 Aug 2020
In follow up of my original issue, this is how the iOS ENF Notification looked today
IMHO, this does not confirm the sum-of-matchcount theory, as iOS ENF Notification would have expected to show > 0.
I saved the daily protocol log (after daily app update), which can be found here:
The "2" Exposures mentioned in my original issue remain a mystery to me 😢
svenkubiak
on 12 Aug 2020
My "weekly iOS update" reports three exposures while the CWA app only shows one exposure. I usually open the app on a daily basis and I've never seen the counter going up to two or three. I think that wouldn't be the expected behavior either, correct?
yanniks
on 12 Aug 2020
@yanniks Your exposure log only shows a "MatchCount" : 1 for the hash "FC11A5902E8AF6B0D553FA3EFE177FE58F274C8B9C2F8CD8599CE731D3D94033" and nothing else. So just from seeing this, the CWA seems to display everything correctly (1 exposure). Also it does not seem to add up the match counts, because the entry occurs 8 times in your log. Maybe this is just a bug from Apples side with the IOS weekly notification?
FelixKuehl
on 13 Aug 2020
@FelixKuehl thanks, that's what I have expected based on going though the logs on the device. Finally, it sounds like this bug is something for Apple's Radar system :blush:
yanniks
on 16 Aug 2020
Is there any update on this? Is someone looking into this? Has someone reached out to Apple and are we awaiting feedback?
Thanks for a short feedback 😄
svenkubiak
on 18 Aug 2020
The plan is to rework this message as soon as possible.
thomasaugsten
on 18 Aug 2020
i can confirm this issue with iphone7, iOS 13.6.1 and Corona Warn App 1.2.1. Happend already twice to me, once around 2 weeks ago and again the day before yesterday. For me as an end-user it is quite disturbing (even if it may not be a bug) because I do not know whether I had been exposed to more people and the phone simply lost this information (so I might be at a higher risk and nor receive notifications) or if it is just simply that two people did not turn out to be infected who encountered me or whatever. It just does not really increase my confidence in the app so I would be very happy if this gets fixed.
Jo-Schie
on 20 Aug 2020
We have one scenario today where we received a notification about 2 potential exposures, but CWA shows no exposures.
Here is the ExposureChecks log file: ExposureChecks-2020-08-21.json.txt
securitygeneration
on 21 Aug 2020
Has someone found out how the ENF notification from Apple is actually calculated or where it gets its data?
svenkubiak
on 21 Aug 2020
Just to add to my last comment: although the actual exposure notification arrived today, as you can see in the logs, there were no matches yesterday/today (but rather almost a week ago).
securitygeneration
on 21 Aug 2020
Update from my side: The iOS notification reported two exposures this week while the app does not show any exposures anymore. Seems like "2 + actual amount of exposures" seems to be the new formula for calculating the value for the iOS notification in my case 😃
yanniks
on 21 Aug 2020
Hi @yanniks,
It would be great that you can share the Exposure Notification log again here.
Thanks.
haosap
on 21 Aug 2020
@haosap sure thing!
ExposureChecks-2020-08-21.json.zip
yanniks
on 21 Aug 2020
@securitygeneration In your json you can see a matchcount of 1 (low risk exposure) at the 15.08 and 16.08 this is in sum 2 matchcounts an this is number what the weekly report of apple shows to you. Because it was only a low risk exposure the app doesn't send a notification
@yanniks
For you its bit difficulty to reproduce it depends when exactly you receive the weekly report with which number. Than we can sum up the days you had a matchCountt of 1 to reproduce the number of Apple
thomasaugsten
on 21 Aug 2020
@thomasaugsten just checked it again, the app reports one exposure now. I got that iOS Exposure Notification push update (I think) two days ago, by then the app did not report anything. I'll continue to observe that behavior and will export the log immediately as soon as I receive the next push notification, sorry for that!
yanniks
on 21 Aug 2020
@yanniks Yes I saw a matchCount today in the json. But I don't think it is worth the effort because apple will rework the weekly report in the next iOS release.
thomasaugsten
on 21 Aug 2020
@securitygeneration In your json you can see a matchcount of 1 (low risk exposure) at the 15.08 and 16.08 this is in sum 2 matchcounts an this is number what the weekly report of apple shows to you. Because it was only a low risk exposure the app doesn't send a notification
But then, why does his app show "No exposure up to now"? Normally, with low risk exposures we've seen so far, the card stays green (+ no notification, because the risk state is not elevated), but the exposures are still counted and displayed.
sin-azucar
on 21 Aug 2020
@sin-azucar Referring to the json the app showed a low risk exposure on the 15.08 and 16.08 in sum 2 exposure for the weekly report
thomasaugsten
on 21 Aug 2020
@thomasaugsten
I had the assumption that after the report I posted after one week of gathering log files, it was disproved that the ENF notification is "just" the sum of matchCount.
svenkubiak
on 21 Aug 2020
Some news from the Swiss repo wrt this issue (h/t @pdehaye):
It seems things are starting to move in this regard. Apple is changing it from a weekly notification to a monthly notification in the upcoming release of iOS 13.7 (currently available as beta to developers). Also, the notification won't include any numbers (matches) anymore but inform users in general, that the iPhone continues to look for possible exposures.
daimpi
on 31 Aug 2020
Hey everyone,
I got one green risk „Risikobegegnung“ on the 24th of August, it was deleted yesterday.
Today my „Covid Begegnungsaufzeichnung“ from
IOS pushed „6 possible encounters“. That is very confusing. I am 100% sure the counter never went up, as I checked every day. _Can someone tell me what that means?_
I’ll add my exposure checks and the screenshot from the message IOS send.
{
"Build" : "17G68",
"ExportVersion" : 1,
"ExposureChecks" : [
{
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"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-24 22:16:01 +0200"
},
{
"Hash" : "8F95F9299978F59E938CF8A3EB8CE8DF76518835A45EE6E43250F9C20E866BDD",
"RandomIDCount" : 3970,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-24 22:16:01 +0200"
},
{
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"RandomIDCount" : 4740,
"MatchCount" : 0,
"DataSource" : "de.rki.coronawarnapp",
"Timestamp" : "2020-08-24 22:16:01 +0200"
},
{
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"Timestamp" : "2020-08-24 22:16:01 +0200"
},
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},
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},
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TeRe20200
on 1 Sep 2020
the detection was found on in file published on 24.08. 02:05.
You can see the after that IOS detects the same detection in the days 25.08 - 31.08.
So the CWA should first have shown you 1 detection on 25.08 and not yesterday. Or do I misunderstood you?
Also in one week IOS found 7 detections but reports only 6.
Please confirm, that CWA starts to show you one detection yesterday.
Tho-Mat
on 1 Sep 2020
Thank you Tho-Mat for your very fast reply.
I had ONE Risikobegegnung in green that was shown the first time on the 24th and that ONE Risikobegegnung was shown until yesterday, the 31th.
Still I don't understand why my weekly update from today says I had SIX possible encounters? Or do I read it wrong?
TeRe20200
on 1 Sep 2020
For each day a match is found in the same key-file, so I assume it is the same "Risikobegegnung".
So the CWA report seems to be ok.
The IOS report is a bit different. It seems to report something like the sum of the matches found. But as @svenkubiak found out, that is not the right assumption.
Tho-Mat
on 1 Sep 2020
Once again thank you for your fast reply. Tho-Mat.
I was just bits shocked thinking I had one green encounter and today reading there were SIX possible ones.
But you are right, the key-files match, as there has been ONE encounter for the days between 24th and 31st - exactly what was shown in my WarnApp.
So the IOS-push-notification seems to be messed up
TeRe20200
on 1 Sep 2020
You can see the after that IOS detects the same detection in the days 25.08 - 31.08.
Technically the first match happened on the 24.08 (at 22:16) and the last match on 30.08 (at 23:31).
But b/c the the checks on the 31st were also performed very late (at 23:31) CWA was showing "1 green encounter" until 23:31 on the 31st afaik.
@TeRe20200 just a small remark: you can attach your ENF log as a file in your comment (just put it in a .zip, or rename the ending to .txt), then your comment doesn't have to span multiple monitor pages 🙂.
daimpi
on 1 Sep 2020
My friend just got a push alert on their iPhone that they had had 5 potential exposures in the past week, but when they open the app it says that they had 1 low risk exposure. Which is it - 5 or 1? It's quite a confusing and alarming mixed message for someone to receive.
MajorGrooves
on 1 Oct 2020
@MajorGrooves Please update to the latest iOS version. Apple fixed this issue.
thomasaugsten
on 1 Oct 2020
Since Apple "fixed" this message (by removing it 😅) in iOS 13.7 and above, I think this Issue can be closed...
Ein-Tim
on 23 Oct 2020
Sure can be closed - But can someone explain to me what caused the actual issue?
svenkubiak
on 23 Oct 2020
But can someone explain to me what caused the actual issue?
Unfortunately no one (except Apple) probably knows ^^.
daimpi
on 23 Oct 2020
But can someone explain to me what caused the actual issue?
Unfortunately no one (except Apple) probably knows ^^.
That is quite disappointing from a technical perspective.
svenkubiak
on 23 Oct 2020
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Most helpful comment
@yanniks Your exposure log only shows a
"MatchCount" : 1for the hash "FC11A5902E8AF6B0D553FA3EFE177FE58F274C8B9C2F8CD8599CE731D3D94033" and nothing else. So just from seeing this, the CWA seems to display everything correctly (1 exposure). Also it does not seem to add up the match counts, because the entry occurs 8 times in your log. Maybe this is just a bug from Apples side with the IOS weekly notification?