Technical Blogs Building a Voice-Controlled Robot Using OpenAI Realtime API: A Full-Link Implementation from RDK X5 to ES02 1. Introduction: Enabling Robots to Understand Human Language Today, consumer-grade robots are no longer high-threshold research devices; they are increasingly being integrated into practical scenarios such as education, entertainment, interaction, and even companionship. Various development kits, including wheeled chassis, quadrupedal robots, and robotic arms, have emerged, significantly lowering the barrier