Fix multiple app filtering in Linux

[fotiDim]

PR Type

enhancement, bug_fix

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Description

• Improved the BLE device filtering mechanism by simplifying the scan filter logic and removing unnecessary custom filter checks.
• Added stream subscriptions to handle device addition and removal events, improving the responsiveness of the application.
• Implemented proper setup and disposal of listeners to manage device events efficiently.
• Removed redundant code, including an extension method for checking custom filters, to streamline the codebase.

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Changes walkthrough 📝

	Relevant files
Enhancement	universal_ble_linux.dart Improve BLE device filtering and event handling in Linux  lib/src/universal_ble_linux/universal_ble_linux.dart Added stream subscriptions for device addition and removal. Simplified the scan filter logic by removing custom filter checks. Implemented listener setup and disposal for device events. Removed redundant extension method for custom filter check. +16/-35

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Resource Management Verify that stream subscriptions are properly cleaned up in all error/edge cases, not just during normal stopScan flow Potential Bug The removal of service filtering logic could allow unwanted devices to be discovered. Verify that removing the service filter checks doesn't break expected filtering behavior Error Handling The adapter.startDiscovery() call should be wrapped in try-catch to handle potential failures gracefully

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
General	Reset filter state during cleanup to prevent stale filter settings from persisting Initialize _bleFilter.scanFilter to null when stopping the scan to ensure proper cleanup and prevent stale filter settings from affecting future scans. lib/src/universal_ble_linux/universal_ble_linux.dart [87-91] -// Dispose listeners +// Dispose listeners and reset filter _deviceAdded?.cancel(); _deviceRemoved?.cancel(); _deviceAdded = null; _deviceRemoved = null; +_bleFilter.scanFilter = null; Apply this suggestion Suggestion importance[1-10]: 8 Why: Resetting the filter state during cleanup is crucial to prevent stale filter settings from affecting subsequent scan operations, which could lead to incorrect device filtering behavior.	8
	Add proper error handling for asynchronous stream cancellation operations Add error handling for stream subscription cancellation to follow Effective Dart error handling guidelines. lib/src/universal_ble_linux/universal_ble_linux.dart [88-89] -_deviceAdded?.cancel(); -_deviceRemoved?.cancel(); +await _deviceAdded?.cancel(); +await _deviceRemoved?.cancel(); Apply this suggestion Suggestion importance[1-10]: 7 Why: Adding 'await' for stream cancellation is important as it ensures proper cleanup of resources and prevents potential memory leaks or race conditions.	7

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