iOS: BluetoothController freezes app

[Gmasek]

Repro steps:

New install of more on phone -> login pair polar device -> restart app --> connect to device --> Ui freeze, background processes running

Something is blocking ui thread

[Gmasek]

When starting up the ios app, there are multiple blocking threads being spawned and blocks the ui

[Gmasek]

09-29 14:28:51.689 💙 INFO BluetoothController::isScanning - Scanning status changed to: true
09-29 14:28:52.094 💙 INFO BluetoothController::didDiscoverDevice - Discovered device: BluetoothDevice {deviceId: E6D2E62F, name: Polar 360 E6D2E62F, address: 54A8015D-EF6D-5B90-474D-0A17F012C0EB}
09-29 14:28:52.095 💙 INFO BluetoothController::connectToDevice - Connecting to BluetoothDevice {deviceId: E6D2E62F, name: Polar 360 E6D2E62F, address: 54A8015D-EF6D-5B90-474D-0A17F012C0EB}

UI FREEZES HERE connecting blocks the main thread, but it stops the scans and then restarts the scan when it should not.

not emitting any failure

09-29 14:28:56.692 💙 INFO BluetoothController::startPeriodicScan - Stop Scanning...
09-29 14:28:56.692 💙 INFO BluetoothController::startPeriodicScan - Stop Scanning finished
09-29 14:29:00.011 💚 DEBUG Observation::observerAccessible - [error_device_not_connected, No polar device connected]
09-29 14:29:00.011 💙 INFO ObservationFactory::autoStartableObservations - Auto-startable observations: []
09-29 14:29:00.013 💙 INFO Napier.i - Updating Schedule states...
09-29 14:29:06.695 💙 INFO BluetoothController::startPeriodicScan - Scanning...

[markus-ebner]

Additional infos

• First connection attempt with Polar did not work – HR was only available after the second attempt.
• App freezes only when Polar is connected. If you swipe away the app and reopen it, the app hangs (only happens when Polar is connected). Reconnect is no longer possible.