EXCEEDS logo
Exceeds
Willem-Jan van Rootselaar

PROFILE

Willem-jan Van Rootselaar

Liudger van Riel developed and maintained advanced integrations for the BSBLAN platform within the home-assistant/core repository, focusing on automation, device onboarding, and reliability. He engineered robust API integrations and backend services using Python and YAML, introducing features such as ZeroConf auto-discovery, re-authentication flows, and hot water scheduling. His work emphasized asynchronous programming and dependency management, optimizing performance and reducing manual configuration. Liudger also enhanced user experience by refining UI elements and documentation, ensuring accurate device representation and onboarding guidance. Through careful error handling and schema validation, he improved system resilience, demonstrating depth in both technical execution and maintainability.

Overall Statistics

Feature vs Bugs

88%Features

Repository Contributions

54Total
Bugs
4
Commits
54
Features
29
Lines of code
7,021
Activity Months12

Work History

April 2026

2 Commits • 1 Features

Apr 1, 2026

April 2026 monthly summary for home-assistant/core: Two changes shipped focusing on resilience and UI accuracy. Bug fix ensures DHW-less devices remain functional and preserve last known state when DHW is unavailable. Feature enhancement improves BSB-LAN integration by including the non-default port in the configuration URL, leading to more accurate device URLs in the Home Assistant interface. These updates strengthen stability for edge cases and improve user experience with clear, traceable commits.

March 2026

8 Commits • 2 Features

Mar 1, 2026

February? Actually Month: 2026-03. Provide a concise monthly summary highlighting the key features delivered, major bugs fixed, overall impact and accomplishments, and technologies demonstrated for the home-assistant/core BSBLAN work in March 2026. The main focus areas were dependency maintenance, a reconfiguration flow, and robustness improvements.

February 2026

18 Commits • 9 Features

Feb 1, 2026

February 2026 performance summary: Delivered significant feature work and stability improvements across BSBLAN/BSB-LAN integrations and documentation, with a focus on reliability, diagnostics, and business value. Key features include BSBLAN HVAC action support for the climate entity, BSBLAN water heater enhancement with a new 'performance' mode, correct operation-mode mapping, and on/off control; introduction of a total energy sensor for BSBLAN with default registry suppression and corresponding tests updates; a new device time synchronization button platform for BSB-LAN; code ownership updates for Homevolt to improve accountability; and expanded documentation for the Total Energy Sensor. Quality and maintenance improvements include stronger type safety, robust handling of None values, test refactors, and dependency upgrades (notably python-bsblan to 5.1.0). Additional robustness work covered string casing improvements, better error handling, and a defined silver quality scale for reliability and documentation. Overall impact: increased automation accuracy, more reliable energy monitoring, and lower maintenance burden through clearer ownership and better developer guidance.

January 2026

8 Commits • 6 Features

Jan 1, 2026

January 2026 — consolidated across mib1185/homeassistant-core, home-assistant.io, and brands. Key features delivered include reliability and performance improvements in hot water scheduling, BSB-Lan timekeeping, and startup flow, plus documentation and branding enhancements. No explicit major bugs documented in this dataset; focus on proactive reliability and UX improvements. Key features delivered: - Hot Water Schedule Schema Validation (core): validate input schemas and time slot formats to reduce scheduling errors. Commits a21062f502156fe4af9c8dbad95b67b9b254225c and 1636eab2e82851c90f76dc3312ecb9f6a1eb6acc. - BSB-Lan Time Synchronization Service (core): robust time sync with error handling for invalid IDs and failures. Commit 9539a612a6a90ea5866dc99785fb053f14f22367. - BSBLAN Library Upgrade and Integration Enhancements (core): upgrade to latest python-bsblan versions to improve HVAC mode handling and device identification. Commits 6c1bf31a3cf0bdbddca64f2e15d93d76180b7c3d and 667b1db5942b6038f5ad3cc6d85c1d59f0da004b. - BSBLAN Startup Optimization (core): asynchronous fetching of device metadata and API call filtering to reduce startup times. Commit d2b8d165d7a87df67d64097c16587d94e7503457. - Documentation: BSB-Lan Timesync Action integration documentation (docs). Commit fb09bb67799c0b1375bf71050c717bfd43024050. - Branding: BSBLAN integration dark theme icons and logos for improved dark mode UX. Commit c801e17c98f9683c4586db2407e810ba3704cf0d. Major bugs fixed: - No explicit major bugs documented in this dataset. The month focused on reliability, performance, and UX improvements. Overall impact and accomplishments: - Strengthened reliability and user trust through input validation, consistent timekeeping, and faster startup. Updated dependencies and detailed docs and branding contribute to smoother onboarding and ongoing maintenance. Cross-repo improvements position the BSBLAN integration for scalable support. Technologies/skills demonstrated: - Input schema validation, asynchronous programming and startup optimization, dependency upgrades, robust error handling, time synchronization, integration enhancements, documentation, and branding for improved UX.

December 2025

6 Commits • 5 Features

Dec 1, 2025

December 2025 monthly performance summary focusing on delivered features, bug fixes, and business impact across three repositories. Highlights include new branding assets (Bravia Quad and HomeVolt icons/logos), BSB-LAN HVAC and hot water enhancements with dependency upgrades and scheduling service, and expanded documentation. These changes improve user experience, automation capabilities, and system reliability across the Home Assistant ecosystem.

November 2025

2 Commits • 1 Features

Nov 1, 2025

November 2025 monthly summary for mib1185/homeassistant-core focused on upgrading the Bsblan integration to align with the python-bsblan library (3.x) and improve compatibility with recent changes.

October 2025

1 Commits • 1 Features

Oct 1, 2025

Month: 2025-10 — BSBlan integration performance optimization and architectural refinement in mib1185/homeassistant-core. Refactored to use separate update coordinators for fast-changing data and slow-changing configuration data, reducing API calls and improving data freshness. Water heater entity now correctly derives limits and operation modes from both coordinators. No major bugs fixed this month; the focus was on reliability, efficiency, and scalability. Impact includes lower latency, reduced server load, and a better user experience for BSBlan-enabled devices. Technologies/skills demonstrated: Python, Home Assistant Core architecture, update-coordinator pattern, refactoring, and cross-team collaboration.

September 2025

2 Commits

Sep 1, 2025

In September 2025, delivered robustness improvements to the BSBLAN integration in home-assistant/core, focusing on handling missing data and correct DHW behavior. This work reduces runtime crashes and enhances data accuracy for climate and water heater entities, contributing to more reliable automations and a better user experience.

August 2025

3 Commits • 1 Features

Aug 1, 2025

August 2025 monthly summary focusing on key accomplishments, business value, and technical achievements for home-assistant/core. Delivered a robust BSBLAN integration experience with an enhanced re-authentication flow that allows credential updates without reconfiguring existing setups, supports partial credential updates and credential clearing, preserves user input during errors for a smoother user experience, and strengthens data retrieval by handling connection and authentication errors more gracefully. The implementation reduces setup friction, minimizes downtime, and improves reliability for BSBLAN users.

July 2025

1 Commits • 1 Features

Jul 1, 2025

July 2025 monthly summary for home-assistant/core focusing on feature delivery and onboarding improvements. Delivered ZeroConf BSBLAN Auto-Discovery and Enhanced Config Flow to streamline device onboarding and configuration, reducing manual steps and improving reliability. No major bug fixes recorded this month; efforts concentrated on feature delivery, code quality, and maintainability.

June 2025

2 Commits • 1 Features

Jun 1, 2025

June 2025 monthly summary for home-assistant/core focusing on dependency management and library upgrades. Delivered Python-bsblan dependency enablement by removing the forbidden-package restriction and upgraded the library to version 2.1.0 to ensure compatibility and access to new features and bug fixes. Work included incremental commits upgrading the library (2.0.1 then 2.1.0) to align with latest releases.

November 2024

1 Commits • 1 Features

Nov 1, 2024

November 2024 focused on documentation enhancements for the BSBLan integration in the Home Assistant docs repository. Delivered a targeted update to clarify Water heater platform support, aligning documentation with actual integration capabilities and improving user guidance.

Activity

Loading activity data...

Quality Metrics

Correctness97.4%
Maintainability90.0%
Architecture90.8%
Performance90.4%
AI Usage24.2%

Skills & Technologies

Programming Languages

JSONMarkdownPNGPythonSVGYAMLmarkdown

Technical Skills

API IntegrationAPI OptimizationAPI developmentAPI integrationAsynchronous ProgrammingBackend DevelopmentData ManagementData Structure OptimizationDependency ManagementDevice CommunicationDocumentationHome Assistant DevelopmentHome Assistant IntegrationHome Assistant integrationIntegration Development

Repositories Contributed To

5 repos

Overview of all repositories you've contributed to across your timeline

mib1185/homeassistant-core

Oct 2025 Feb 2026
5 Months active

Languages Used

Python

Technical Skills

API OptimizationAsynchronous ProgrammingData ManagementDevice CommunicationHome Assistant IntegrationPython

home-assistant/core

Jun 2025 Apr 2026
7 Months active

Languages Used

Python

Technical Skills

Pythondependency managementpackage managementAPI integrationbackend developmentunit testing

cdce8p/ha-core

Feb 2026 Feb 2026
1 Month active

Languages Used

JSONPythonYAML

Technical Skills

API IntegrationAPI integrationBackend DevelopmentHome Assistant DevelopmentPythonPython development

home-assistant/home-assistant.io

Nov 2024 Feb 2026
4 Months active

Languages Used

Markdownmarkdown

Technical Skills

DocumentationHome Assistant integrationautomation scriptingdocumentationautomationintegration development

home-assistant/brands

Dec 2025 Jan 2026
2 Months active

Languages Used

SVGPNG

Technical Skills

UI designUI/UX designgraphic design