https://github.com/GomSpace/libcsp

Cubesat Space Protocol - A small network-layer delivery protocol designed for Cubesats
https://github.com/GomSpace/libcsp

products-software sw

Last synced: 18 days ago
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Cubesat Space Protocol - A small network-layer delivery protocol designed for Cubesats

• Host: GitHub
• URL: https://github.com/GomSpace/libcsp
• Owner: GomSpace
• License: lgpl-2.1
• Fork: true (libcsp/libcsp)
• Created: 2017-01-03T19:27:13.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2024-07-01T06:49:06.000Z (5 months ago)
• Last Synced: 2024-07-31T22:55:03.725Z (3 months ago)
• Topics: products-software, sw
• Language: C
• Homepage: http://www.libcsp.org
• Size: 2.99 MB
• Stars: 29
• Watchers: 33
• Forks: 8
• Open Issues: 1
• Metadata Files:
  • Readme: README.rst
  • Changelog: CHANGELOG
  • License: COPYING

Awesome Lists containing this project

README

        
The Cubesat Space Protocol

==========================

Cubesat Space Protocol (CSP) is a small protocol stack written in C. CSP is designed to ease communication between distributed embedded systems in smaller networks, such as Cubesats. The design follows the TCP/IP model and includes a transport protocol, a routing protocol and several MAC-layer interfaces. The core of `libcsp` includes a router, a connection oriented socket API and message/connection pools.

The protocol is based on a 32-bit header containing both transport and network-layer information. Its implementation is designed for, but not limited to, embedded systems such as the 8-bit AVR microprocessor and the 32-bit ARM and AVR from Atmel. The implementation is written in GNU C and is currently ported to run on FreeRTOS, Linux (POSIX), MacOS and Windows. The primiary platforms being used are FreeRTOS and Linux.

The idea is to give sub-system developers of cubesats the same features of a TCP/IP stack, but without adding the huge overhead of the IP header. The small footprint and simple implementation allows a small 8-bit system to be fully connected on the network. This allows all subsystems to provide their services on the same network level, without any master node required. Using a service oriented architecture has several advantages compared to the traditional mater/slave topology used on many cubesats.

 * Standardised network protocol: All subsystems can communicate with eachother

 * Service loose coupling: Services maintain a relationship that minimizes dependencies between subsystems

 * Service abstraction: Beyond descriptions in the service contract, services hide logic from the outside world

 * Service reusability: Logic is divided into services with the intention of promoting reuse.

 * Service autonomy: Services have control over the logic they encapsulate.

 * Service Redundancy: Easily add redundant services to the bus

 * Reduces single point of failure: The complexity is moved from a single master node to several well defined services on the network

The implementation of `libcsp` is written with simplicity in mind, but it's compile time configuration allows it to have some rather advanced features as well:

Features

--------

 * Thread safe Socket API

 * Router task with Quality of Services

 * Connection-oriented operation (RFC 908 and 1151).

 * Connection-less operation (similar to UDP)

 * ICMP-like requests such as ping and buffer status.

 * Loopback interface

 * Very Small Footprint in regards to code and memory required

 * Zero-copy buffer and queue system

 * Modular network interface system

 * OS abstraction, currently ported to: FreeRTOS, Linux (POSIX), MacOS and Windows

 * Broadcast traffic

 * Promiscuous mode

 * Encrypted packets with XTEA in CTR mode

 * Truncated HMAC-SHA1 Authentication (RFC 2104)

LGPL Software license

---------------------

The source code is available under an LGPL 2.1 license. See COPYING for the license text.