@csllc/j1939/example/network_management.js

J1939 transport layer for CANBUS communication

// Example that demonstrates J1939-81 network management and address claiming
// Usage: node network_management.js --name "00 00 00 00 00 00 00 00"
// CTRL-C stops the example

const Can = require('@csllc/cs-canbus-universal');
const J1939 = require('..');

let name = [ 0, 0, 0, 0, 0, 0, 0, 0 ];

let nameArgumentIndex = process.argv.findIndex((a) => a === '--name');
if (nameArgumentIndex > 0) {
  let nameString = process.argv[nameArgumentIndex + 1];
  
  if (nameString) {
    nameString = nameString.split(" ");

    if (nameString.length != 8) {
      throw new Error("NAME must be 8 bytes long");
    }

    name = nameString.map((i) => parseInt(i, 16));
  }
}

console.log("Using NAME", name);

let can = new Can({
  canRate: 250000,

  // Only allow J1939 network management through
  filters: [
    {
      ext: true,
      mask: 0x00F80000,
      code: 0x00EE0000
    }
  ]
});

// Event handlers
can.on('open', () => console.info('Port Open'));

can.on('error', (err) => console.error('Port Error:', err));

can.on('data', (msg) => console.log('Msg: ', msg.id.toString(16), msg.buf));

can.on('close', (err) => {
  if (err && err.disconnected) {
    console.log('Port Disconnected');
  } else {
    console.log('Port Closed by application');
  }
});

// Look for compatible CAN adapters
can.list()
.then(function(ports) {
  if (ports.length > 0) {
    // Set up J1939 stack to use CAN interface
    let j1939 = new J1939(can, {
      address: 0x80,
      name: name,
      addressRange: [ 0x80, 0xEF ],
      priority: 6
    })

    j1939.on('data', (msg) => console.log("j1939 data", msg));
    j1939.on('error', (e) => console.log("j1939 error", e.message));
    j1939.on('address', (status, address) => console.log("j1939 address, status", address, status));

    // Open CAN interface
    return can.autoOpen(ports);
  } else {
    console.error('No CAN devices found');
    return Promise.reject();
  }
})
.catch(function(err) {
  // Something went wrong...
  console.error(err);
  can.close();
  process.exit(-1);
});