Worked on stabilizing CoAP-related connectivity tests for the thingsboard/thingsboard-edge repository, focusing on backend development and unit testing using Java. Addressed a key bug by updating the DeviceConnectivityControllerTest to use a new default CoAP device profile instance and explicit transport configuration, ensuring the test environment accurately reflects production setups without altering functional behavior. Refactored test variable names to improve readability and maintainability, which helps reduce onboarding time and potential errors. These changes enhanced test clarity and reliability, laying the foundation for more robust CoAP support and enabling faster, more accurate continuous integration feedback for future updates and code changes.