Fix issues in MQTT integration samples

[PasinduGunarathne]

Purpose

• Improve the sample code of the MQTT Ballerina connector publishing and consuming flows and update the integration samples

Goals

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Approach

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User stories

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Release note

Brief description of the new feature or bug fix as it will appear in the release notes

Documentation

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Training

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Certification

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Marketing

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Automation tests

• Unit tests

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• Integration tests

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Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes/no
• Ran FindSecurityBugs plugin and verified report? yes/no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes/no

Samples

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Related PRs

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Test environment

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Learning

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR updates two MQTT connector samples to demonstrate temperature sensor communication. The connector sample configuration now provides concrete defaults for the MQTT broker URI, client ID, and topic; the publish logic sends a temperature value ("25.5") with QoS 2 and retention enabled, logging the action. The trigger sample listener is reconfigured with a fixed temperature topic and manual acknowledgments; the message handler now decodes the payload, parses the temperature as a float, logs conditionally based on a 30.0-degree threshold, and explicitly acknowledges successful processing. An error handler is added to log MQTT processing errors.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description only completes the Purpose section with substantive content; all other required sections (Goals, Approach, User stories, Release note, Documentation, Training, Certification, Marketing, Automation tests, Security checks, Samples, Related PRs, Migrations, Test environment, and Learning) contain only placeholder text or are incomplete.	Fill in the remaining sections with concrete information: provide implementation details in Goals and Approach, specify test coverage and results in Automation tests, confirm security checks, and complete other required sections with relevant information or 'N/A' with justification.
Title check	❓ Inconclusive	The title 'Fix issues in MQTT integration samples' is vague and generic, using non-specific language that does not clearly convey the actual changes made to the codebase.	Clarify the title to specifically describe the main changes, such as 'Update MQTT connector samples with temperature-based logic and manual acknowledgements' or similar descriptive phrasing that indicates the primary modifications.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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