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.
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()There are two options for installing node-can:
- Clone / download node-can from GitHub, then:
$ npm i
$ npm run configure
$ npm run build- Install via npm:
$ npm install socketcan