Hello everybody,
I've recently started to work on restbus-simulation based on SocketCAN.
Since it is now somewhat useable I decided to announce it here to find
some advise and helpers to proceed even faster.
The preliminary name is RestCAN. It basically consists of a set of Node
modules (nodejs.org), which enable the user to develop the behaviour of
CAN node within a "simple to write" Javascript.
Background
==========
The idea was born because of my personal need to test CAN nodes by
simulating certain parts of a network. And I also wanted to have a
simple to use sandbox to implement and test new protocols or control
algorithms.
I decided to use Javascript because this language is subject of current
optimization efforts (Webkit, V8, SpiderMonkey). To provide and powerful
development environment I switched to use NodeJS instead of using V8
from scratch. NodeJS is a asynchronous event oriented Javascript
environment with tons of third party modules (NPM) and a good subset of
builtin utilities (File I/O, TCP/UDP, HTTP, IPC, ...).
Current status
==============
The current status is a Node module to work with raw channels, so a user
can write a script to send and receive raw CAN messages.
Example
=======
var can = require('../build/Release/can');
var channel = can.createRawChannel("vcan0");
// Start communication
channel.start();
// Send a CAN message in EFF
channel.send({ id: 12, ext: true, data: [ 1,2,3,4,5,6,7,8 ] });
// Register a listener for incoming messages
channel.addListener("onMessage",
function(msg) {
console.log("Message received");
console.log(msg);
});
Planned features
================
Next step is to support specifing Rx filters and support BCM and ISOTP
channels.
To make it a real restbus-simulation I plan to implement a CAN database
service to receive and decode signals within CAN messages and also to
generate CAN messages out of the CAN database.
Performance
===========
A last note about performance, I know some people may have critic
thoughts one performance if they hear Javascript. I made some short test
here and I was able to receive roughly 9k msgs/s (cangen vcan0 -g 0 -i)
within a VirtualBox VM with a Core i5 running at 2.8GHz. Another script
was able to generate 7k msgs/s on the same machine. I'm okay with this
results so far since nothing is optimized yet. Since Node has already
proved its performance in certain setups I'm quite confident we can gain
more performance.
Help
====
You see it is a lot of stuff to do here, so any help is really
appreciated. Due to lack of real CAN hardware here, I also appreciate
any help to test restcan with real CAN hardware.
The project is hosted on github: https://github.com/sebi2k1/restcan
Cheers,
Sebastian
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