connectedcars / node-can

NodeJS SocketCAN extension

node-can

This is a NodeJS SocketCAN extension. SocketCAN is a socket-based implementation of the CANbus protocol for Linux system.

This extensions makes it possible to send and receive CAN messages (extended, remote transission) using simple Javascript functions.

Usage

Basic CAN example:

var can = require('socketcan');

var channel = can.createRawChannel("vcan0", true);

// Log any message
channel.addListener("onMessage", function(msg) { console.log(msg); } );

// Reply any message
channel.addListener("onMessage", channel.send, channel);

channel.start();

Working with message and signals:

var can = require('socketcan');
var fs = require('fs');

// Parse database
var network = can.parseNetworkDescription("samples/can_definition_sample.kcd");
var channel = can.createRawChannel("vcan0");
var db_motor = new can.DatabaseService(channel, network.buses["Motor"]);
var db_instr = new can.DatabaseService(channel, network.buses["Instrumentation"]);

channel.start();

// Register a listener to get any value changes
db_motor.messages["CruiseControlStatus"].signals["SpeedKm"].onChange(function(s) {
   console.log("SpeedKm " + s.value);
});

// Register a listener to get any value updates
db_motor.messages["Emission"].signals["Enginespeed"].onUpdate(function(s) {
   console.log("Enginespeed " + s.value);
});

// Update tank temperature
db_instr.messages["TankController"].signals["TankTemperature"].update(80);

// Trigger sending this message
db_instr.send("TankController");

channel.stop()

Install

There are two options for installing node-can:

1. Clone / download node-can from GitHub, then:

    $ npm i
    $ npm run configure
    $ npm run build

2. Install via npm:

    $ npm install socketcan