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README.md

socketcand

Socketcand is a daemon that provides access to CAN interfaces on a machine via a network interface. The communication protocol uses a TCP/IP connection and a specific protocol to transfer CAN frames and control commands. The protocol specification can be found in ./doc/protocol.md.

Installation

To build and run socketcand make sure you have the following tools installed:

  • make
  • gcc or another C compiler
  • a kernel that includes the SocketCAN modules
  • the headers for your kernel version
  • the libconfig with headers (libconfig-dev under debian based systems)

First run

$ ./configure

to check your system and create the Makefile. If you want to install scripts for a init system other than SysVinit check the available settings with './configure -h'. To compile and install the socketcand run

$ make
$ make install

Service discovery

The daemon uses a simple UDP beacon mechanism for service discovery. A beacon containing the service name, type and address is sent to the broadcast address (port 42000) at minimum every 3 seconds. A client only has to listen for messages of this type to detect all SocketCAN daemons in the local network.

Usage

socketcand [-v | --verbose] [-i interfaces | --interfaces interfaces] [-p port | --port port] [-l ip_addr | --listen interface] [-h | --help]

Description of the options

  • -v activates verbose output to STDOUT
  • -i interfaces is used to specify the SocketCAN interfaces the daemon shall provide access to
  • -p port changes the default port (29536) the daemon is listening at
  • -l interface changes the default network interface (eth0) the daemon will bind to
  • -h prints a help message
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