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Low-Latency Systems Protocol Repository

  • :material-airplane:{ .lg .middle } Aerospace Protocols

    ARINC 429, 664 (AFDX), 653 (APEX), 665, 615A bit-level codecs and deterministic Ethernet for avionics systems.

    :octicons-arrow-right-24: Aerospace

  • :material-ethernet:{ .lg .middle } High-Performance Networking

    Raw sockets, epoll reactors, zero-copy I/O, and DPDK sub-microsecond packet processing on commodity hardware.

    :octicons-arrow-right-24: Networking

  • :material-chip:{ .lg .middle } Embedded Hardware

    UART, SPI, I2C, CAN Bus, GPIO direct register access via Linux device files with DMA-aware buffering.

    :octicons-arrow-right-24: Embedded

  • :material-factory:{ .lg .middle } Industrial Automation

    Modbus RTU/TCP, EtherCAT, PROFINET field-bus and industrial Ethernet protocols for real-time control.

    :octicons-arrow-right-24: Industrial

Quick Start

# Clone and build everything
git clone https://github.com/GauravAgarwalGarg/Protocols.git
cd Protocols
make all

# Run a specific module test
./build/arinc429_demo
./build/ring_buffer_demo

# Build with debug symbols
make debug

# Static analysis
make lint

Design Philosophy

Principle Implementation
First Principles Direct syscalls, no wrappers (Boost, Qt, etc.)
Zero Allocation Pre-allocated pools, no malloc in hot path
Lock-Free Atomics with explicit memory_order_acquire/release
Cache-Conscious 64-byte aligned structures, no false sharing
Deterministic Bounded loops, no unbounded recursion
Production-Ready -Wall -Wextra -Werror, static analysis clean

Performance Highlights

Module Throughput Latency (p99)
Ring Buffer (SPSC) 18.4 M ops/sec < 28 µs
SPSC Queue (zero-copy) 27.7 M ops/sec < 805 ns
Memory Pool (MPMC) 9.7 M ops/sec
epoll Reactor 199 events/100ms 1ms timer accuracy

Requirements

  • OS: Linux kernel 5.4+ (for io_uring, PACKET_MMAP, CAN FD)
  • Compiler: GCC 11+ or Clang 14+ (C11 and C++20)
  • Dependencies: None only libc, libpthread, and kernel headers
  • Privileges: Root or CAP_NET_RAW for raw socket modules

Repository Structure

Protocols/
├── src/
│   ├── aerospace/       # ARINC 429, 664, 653, 665, 615A
│   ├── network/         # Raw sockets, epoll, zero-copy, DPDK
│   ├── embedded/        # UART, SPI, I2C, CAN, GPIO
│   ├── concurrency/     # Ring buffer, SPSC queue, memory pool
│   ├── transport/       # TCP, UDP multicast, QUIC
│   └── industrial/      # Modbus, EtherCAT, PROFINET
├── docs/                # This documentation (MkDocs)
├── tests/               # Integration test harnesses
├── build/               # Compiled binaries
├── Makefile             # Root build orchestrator
└── mkdocs.yml           # Documentation config