In May 2026, the EMQX repository (emqx/emqx) delivered two high-impact improvements that strengthen reliability and scalability for IoT messaging. First, startup reliability was stabilized by upgrading EMQX to otp-28.4.1-3 and bumping EMQTT to 1.15.1, preventing boot stalls when a node is not connected to a cluster and ensuring compatibility with the Mria app. Second, per-connection TCP socket control was enhanced by exposing tcp_opts.active_n for per-connection tuning of outbound MQTT bridge connectors and cluster links, enabling finer-grained resource management under load. These changes collectively reduce downtime, improve startup determinism, and optimize network throughput in clustered deployments. Technologies demonstrated include upgrade paths and dependency management in EMQX, and TCP socket tuning for high-scale MQTT bridges and cluster links.

April 2026 monthly summary for emqx/emqx: Focused on stability and performance improvements in the core broker, delivering a routing stability fix post-upgrade and configurable distribution port options to enhance cluster communication and scalability.

February 2026 monthly summary: Strengthened TLS-based client identity validation in QUIC by adding targeted CN/DN extraction tests and expanding certificate handling coverage. Delivered a focused feature set that improves test coverage, reliability, and security posture for QUIC TLS client authentication. This work reduces production risk by validating CN/DN extraction across various verification settings and enhances the testing framework for SSL certificate handling in EMQX.

Month: 2025-12. Focused on stability and forward-compatibility for EMQX by upgrading core dependencies to support OTP 28. Delivered a targeted Quicer upgrade (0.2.16) in emqx/emqx, aligning with OTP 28 requirements and enabling downstream bug fixes and improvements from newer releases. This work reduces upgrade friction for customers on OTP 28, mitigates risk in the networking stack, and maintains API consistency while preparing the project for future enhancements.

November 2025 monthly summary for emqx/emqx focusing on delivering stability and interoperability in MQTT v5 flows. Key changes include backward-compatible enhancements to the MQTT response_information schema, enabling binary response data handling and aligning tests to treat response_information as binary. Also addressed runtime stability by fixing crashes in MQTT v5 connections caused by type mismatches in the request-response-information property. These changes improve data fidelity, reduce runtime errors, and simplify configuration for users relying on v5 features.

Month: 2025-10. Delivered QUIC datagram support and connectivity testing for EMQX (emqx/emqx). Implemented datagram state changes handling, including zero-length packets, added new callbacks and tests, and updated the changelog to reflect MQTT over QUIC connection probing via datagrams. This work enhances observability and reliability of QUIC-based connectivity checks, while ignoring non-zero-length datagrams during tests to reduce false positives. The initiative advances EMQX readiness for production QUIC deployments and provides a solid foundation for future QUIC features.

September 2025 (emqx/emqx): Focused on stabilizing QUIC-related capabilities, expanding test coverage, and tightening build/release reliability. Delivered end-to-end QUIC/TLS interoperability tests with 0-RTT scenarios and environment-driven QUICER NIF load skip, hardened alarm activation path, and refreshed CI/dependency management for QUIC stability. Documentation updated with changelog notes to reflect these changes. These efforts reduce outage risk, improve QA coverage, and accelerate safe deployment of QUIC features.

July 2025 Monthly Summary (emqx/emqx) – concise, business-focused review of key development efforts and outcomes. This month focused on hardening authentication flows and improving deployment observability and efficiency. Deliverables align with our goal of robust, scalable identity management and secure, maintainable releases.

May 2025: Focused stability, performance, and maintainability improvements across EMQX core and docs. Delivered critical dependency upgrades, routine maintenance bumps, test stabilization efforts, and updated performance tuning guidance to support large-scale deployments.

April 2025 monthly summary: Implemented flexible cluster networking and strengthened cluster stability while modernizing dependencies. Delivered networking interface support for cluster nodes (-i/--interface) with cross-OS alias handling, improving cluster resiliency and deployment flexibility. Hardened MQTT session handling and protocol correctness by fixing CONNACK RC behavior when the server is busy and expanding test coverage. Improved Raft cluster stability by preventing premature removal of nodes and introducing explicit node presence management in tests. Upgraded quicer to 0.2.5 across configuration to benefit from patches and ongoing maintenance without changing behavior. These changes deliver tangible business value: more reliable cluster operations, fewer false node removals, and smoother upgrades.

March 2025 monthly summary for emqx/emqx: Focused on stabilizing test suites and upgrading dependencies to improve reliability. Delivered concrete reliability improvements for MQTT/QUIC tests and upgraded EMQTT to 1.13.6 to address flakiness and enhance CI stability. These efforts contributed to faster feedback, more stable releases, and better test coverage.

February 2025 monthly summary for emqx/emqx: Delivered core CI infrastructure updates, stability improvements for QUIC, and reliability enhancements for the MQTT test suite, while aligning Elixir code with the project’s style guidelines. These efforts reduce run-time risk, improve deployment confidence, and enhance code readability and maintainability.

January 2025 monthly summary focusing on business value and technical achievements across EMQX and docs. Highlights include QUIC stack upgrades and TLS observability, improved operational stability on macOS, enhanced observability and CI/test robustness, and targeted documentation clarifications to reduce user friction and enable OTP-27 readiness.

December 2024 monthly summary focusing on security hardening and operational tooling for emqx/emqx. Implemented a cryptographic password hashing overhaul using crypto:pbkdf2_hmac, removing legacy PBKDF2 and weak algorithms, and retiring the erlang-pbkdf2 dependency. Added and documented a firewall management script (emqx_fw) to automate iptables rules for protecting listeners against SYN floods with configurable rate and burst. Improved error handling and updated the breaking changes changelog/documentation. These changes reduce attack surface, simplify security maintenance, and provide practical tooling for network hardening.

2024-11 monthly summary: Focused on strengthening QUIC transport reliability, cross-platform build support, and OpenSSL 3.0 MAC management across emqx/emqx and erlang/otp. Delivered key features and fixes to improve stability, performance, and business value.

October 2024 monthly performance summary for emqx/emqx focused on delivering business value through performance improvements and compatibility fixes. Key work included enabling memory-efficient QUIC stream management and rolling back a security-hardening change to preserve backward compatibility with tar-release dynamical libraries. These efforts improved runtime efficiency for idle connections and maintained deployment compatibility without introducing new security risks.