Multiplayer, IoT, and Home Assistant support via two MQTT bricks

Pocket Code currently lacks a scalable way for projects to communicate beyond a single device, which limits its ability to support real-time multiplayer features and IoT use cases. While Bluetooth-based communication exists, it is limited in range and flexibility, and does not support internet-based interaction or integration with modern systems like smart home platforms. This project solves this by adding MQTT-based communication to Pocket Code through simple visual bricks for sending and receiving messages. A shared connection manager handles communication efficiently, with support for secure connections, message routing, and reliability through offline queuing and retries. It also introduces a standard topic structure for IoT integration (e.g., Home Assistant) and enables multiplayer synchronization over Wi-Fi, making Pocket Code a more connected and powerful platform. Key Deliverables: 1. MQTT connection manager with lazy initialization and connection reuse 2. Publish and Receive MQTT bricks integrated into Pocket Code 3. Wildcard topic support and event-driven message handling 4. Offline message queue with automatic retry on reconnect 5. Secure communication using TLS and authentication 6. Standardized MQTT topic conventions for IoT and Home Assistant integration 7. MQTT-based multiplayer synchronization layer 8. Comprehensive automated tests (TDD-based development) This project transforms Pocket Code into a connected programming platform, enabling users to build real-time multiplayer applications and interact with IoT devices using an intuitive visual interface.