AB#292767 fix: stopDispatchTimer starting the timer when called off the main thread

[eligutovsky]

Description of Changes

OptiTrack.stopDispatchTimer() called startDispatchTimer() when invoked off the main
thread, so every off-main stop started the dispatch timer instead of stopping it.

     func stopDispatchTimer() {
         guard Thread.isMainThread else {
             DispatchQueue.main.sync {
-                self.startDispatchTimer()
+                self.stopDispatchTimer()
             }
             return
         }

This is a cherry-pick of 10aabcc1 (Christopher Wyllie, 2022-04-29) from the
fix-dispatch-timer branch, which was never merged. Original authorship is preserved.
The branch it sat on is 208 commits behind master; the single-line change cherry-picks
cleanly onto current master.

Second commit bumps the patch version to 6.8.1.

Breaking Changes

• None

Release Checklist

Prepare:

• Detail any breaking changes. Breaking changes require a new major version number — none; patch release
• Check pod lib lint passes
• Update any relevant sections of the repository wiki pages on a branch — n/a, no public API change

Bump versions in:

• OptimoveCore.podspec

• OptimoveNotificationServiceExtension.podspec

• OptimoveSDK.podspec

• OptimoveCore/Sources/Classes/Constants/SDKVersion.swift

• README.md — n/a, contains no version reference

• CHANGELOG.md

• Update major version numbers in wiki (basic integration + push guides) — n/a, patch release

Integration tests

Unit tests run locally on the UnitTests scheme (iPhone 15, iOS 17.5): 75 tests,
0 failures. Manual integration checklist below not exercised — the change is confined
to timer invalidation on the event-dispatch path.

T&T Only

• Init SDK with only T&T credentials
• Associate customer
• Associate email
• Track events

Mobile Only

• Init SDK with all credentials
• Track events
• Associate customer (verify both backends)
• Register for push
• Opt-in for In-App
• Send test push
• Send test In-App
• Receive / trigger deep link handler (In-App/Push)
• Receive / trigger the content extension, render image and action buttons for push
• Verify push opened handler

Deferred Deep Links

• With app installed, trigger deep link handler
• With app uninstalled, follow deep link, install test bundle, verify deep link read from Clipboard, trigger deep link handler

Combined

• Track event for T&T, verify push received
• Trigger scheduled campaign, verify push received
• Trigger scheduled campaign, verify In-App received

Release:

• Squash and merge to master
• Delete branch once merged
• Create tag from master matching chosen version
• Run pod trunk push to publish to CocoaPods

Post Release:

• Push wiki pages to master

[Copilot]

Pull request overview

This PR fixes a threading bug in the OptiTrack dispatch-timer shutdown path: calling stopDispatchTimer() off the main thread previously routed to startDispatchTimer(), unintentionally starting the timer instead of stopping it. It also bumps the SDK patch version to 6.8.1 and records the fix in the changelog.

Changes:

• Fix OptiTrack.stopDispatchTimer() to correctly stop the timer when invoked off the main thread by re-dispatching to main and calling stopDispatchTimer() (not startDispatchTimer()).
• Bump CocoaPods spec versions and SDKVersion to 6.8.1.
• Add a 6.8.1 changelog entry describing the fix.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
OptimoveSDK/Sources/Classes/Components/OptiTrack/OptiTrack.swift	Fixes off-main-thread timer stop logic to prevent accidentally starting the dispatch timer.
OptimoveSDK.podspec	Bumps OptimoveSDK pod version to 6.8.1.
OptimoveNotificationServiceExtension.podspec	Bumps Notification Service Extension pod version to 6.8.1.
OptimoveCore/Sources/Classes/Constants/SDKVersion.swift	Updates SDKVersion constant to 6.8.1.
OptimoveCore.podspec	Bumps OptimoveCore pod version to 6.8.1.
CHANGELOG.md	Adds 6.8.1 entry documenting the timer-stop fix.

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