ios subscribeToCharacteristic crashes the app

[dawidb-appdate]

Describe the bug
Subsrcibing to specific characteristic crashes ios app immediately. Android one works well with the same code.

To Reproduce
Steps to reproduce the behavior:

1. use sample app

2. change body of the function Future discoverServices(String deviceId) async
   to something like
   `final characteristic = QualifiedCharacteristic(serviceId: Uuid.parse('4c0719b0-c810-492b-87b1-63c6c3fd584f'), characteristicId: Uuid.parse('4c0719b3-c810-492b-87b1-63c6c3fd584f'), deviceId: deviceId);

   _ble.subscribeToCharacteristic(characteristic).listen((data) {
   print(data.toString());
   }, onError: (dynamic error) {
   print(error);
   });`

3. launch the app

4. tap search button

5. select device

6. tap connect and wait until status changes

7. tap Discover services

8. app immediately crashes - tries to subsrcibe to characteristic

Note: original code for discovering services works properly on both ios and android, so service and characteristics are discovered
.

Expected behavior
Should receive data printed on console - Android works properly

Smartphone / tablet

• Device:iPhone XS
• OS: iOS 14
• Package version: 2.6.1+1

Attached screenshot from xcode

[werediver]

Thank you for reporting this.

I have an idea why this can happen and how the issue can be fixed (mitigated).

[dawidb-appdate]

hey @werediver, have you by any chance figure this one out? thnks :)

[werediver]

@danielroek @dawidb-appdate Yes, the pull-request #139 should fix this issue. We now have issues with CI, this is why the pull-request is not merged yet. As of November 1st Codemagic stopped providing "teams" functionality for free, which breaks our integration.

You should be able to use the corresponding branch from this repository via dependency_override option in your top-level package (the app). If you do that, please let us know whether the fix works for you.

[danielroek]

I believe @dawidb-appdate was supposed to be mentioned

[dawidb-appdate]

@werediver it seems to fix the issue
just fyi it's crashing in debug scheme (release seems to be working), so you're unable to work with live data and console on for iOS devices. if you build an .ipa for ios (adhoc/appstore) it will work properly. as a workaround - android is working in debug mode
will it be tagged on master/released anytime soon?

[werediver]

@dawidb-appdate It could have worked in release mode without the fix anyway. Does the fix actually fix anything for you? Did you manage to override your dependency with the version from the branch (the feature-branch originally, but now "master", because the pull-request was integrated)? A release is planned in soon, perhaps after #141 is merged.

[dawidb-appdate]

i'll check 2.6.1+1 in the release mode to confirm if it really was only debug issue.
for now, master version is still crashing in debug mode on iOS (per description)

[dawidb-appdate]

sorry it took so long, here are my test results:
2.7.1, 2.6.1+1 and 2.5.3 has the same issue: release app works properly, debug app crashes as described
@werediver

[werediver]

Thank you for doing the extra tests. Let's reopen then.

Let's treat #142 as a duplicate, as this ticket is older.