Xin Xu enhanced the EVerest/libocpp repository by implementing security hardening for certificate installation within embedded systems. Using C++ and configuration management techniques, Xin introduced policy-driven checks that enforce a minimum security profile and restrict certain certificate types when security is low, directly addressing risks in certificate management. The work included refactoring the security controller and configuration naming to improve maintainability and reduce misconfigurations, while also adding helper logic to determine install eligibility. By focusing on OCPP protocol security, Xin’s changes improved code clarity and governance, enabling safer certificate handling without altering external APIs, and laid groundwork for future enhancements.