A Modular and Secure Opcode Protocol for Programmable Matter

This paper presents SP-CellBots, a modular communication and control framework for programmable matter based on a secure and extensible opcode protocol. The system models a lattice of self-organizing robotic cubes that can morph, communicate, and collaborate through hardware-agnostic command sequences. A minimal instruction set, cryptographic message authentication, and slot-based connectivity form the protocol core, while extensions enable encrypted key updates, swarm morphogenesis, and decentralized coordination. SP-CellBots provides both a theoretical foundation and an open-source implementation to advance research in reconfigurable and self-organizing robotic systems. In its current evolution stage, the framework also exposes a machine-readable API layer for diagnosis and manipulation, designed to support LLM-guided control in dynamic cluster scenarios. The proposed protocol enables authenticated, low-overhead control at scale, bridging simulation and future hardware swarms for programmable matter. As a practical indication (not a benchmark), an initial external LLM test showed that simple cluster operations can already be executed through the self-descriptive API. Repository and API reference: https://github.com/svenpohl/sp-cellbots https://github.com/svenpohl/sp-cellbots/blob/main/docs/api.md