teddyCloud is a self-hosted, open-source replacement server for the Toniebox children's audio player. It implements the entire cloud-side protocol stack—including HTTPS, TLS, MQTT, and custom protobuf-based APIs—to intercept, proxy, cache, and serve audio content to physical Toniebox devices. The application is written in C, builds on the CycloneTCP networking library, and integrates a full MQTT server, a Home Assistant bridge, a web administration interface, and tools for firmware patching (ESP32, CC3200, CC3235) and certificate generation. It also includes a WebAssembly-based TAF audio encoder for browser-side use. The codebase is a result of extensive reverse engineering of the Toniebox protocol, demonstrating deep expertise in embedded systems, cryptography, and IoT networking. While tightly coupled to the Toniebox ecosystem, several components (MQTT server, settings overlay system, WASM encoder) are designed with sufficient abstraction to be reusable in other contexts.