Worked on the esphome/esphome repository to enhance Modbus payload validation, focusing on improving data integrity and robustness in embedded systems. Developed a new function in C++ to determine required payload size based on sensor value types, ensuring accurate buffer checks before processing. This approach reduced the risk of runtime errors such as overflows and misreads during Modbus data handling. Comprehensive unit tests were added to validate both normal and edge cases, supporting future sensor type expansion. The work emphasized maintainable code practices, resulting in more reliable Modbus integrations and easier extensibility for future development within the embedded systems domain.