Documentation

LibOSDP

A cross-platform C library implementing IEC 60839-11-5 OSDP — secure, non-blocking, and dependency-free.

LibOSDP is a cross-platform C library implementing the IEC 60839-11-5 Open Supervised Device Protocol (OSDP). It enables secure, reliable communication between Control Panels (CP) and Peripheral Devices (PD) in access control systems.

Key Features ​

  • Secure Channel — AES-128 encrypted communication with an optional OSDP_FLAG_ENFORCE_SECURE flag for stricter security.
  • Cross-Platform — Runs on bare-metal, Linux, macOS, and Windows. No runtime memory allocation.
  • Language Bindings — Rust, Python 3, and C++ bindings over the C library.
  • Non-Blocking Design — Fully asynchronous. Call osdp_cp_refresh() / osdp_pd_refresh() at least once every 50 ms.
  • No External Dependencies — Self-contained for easy cross-compilation to any target.
  • Test Coverage — Unit tests and integration tests via PyTest.

Getting Started ​

See Build and Install to build the library, then jump to the API Reference to start integrating.

Source ​

LibOSDP is open source under the Apache-2.0 License and hosted on GitHub.