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Copy pathtransport.js
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53 lines (45 loc) · 1.55 KB
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'use strict';
const createSocket = require('dgram').createSocket;
const EventEmitter = require('events').EventEmitter;
const debug = require('debug')('bacnet');
const DefaultBACnetPort = 47808;
class Transport extends EventEmitter {
constructor(settings) {
super();
this._settings = settings;
this._server = createSocket({type: 'udp4', reuseAddr: true});
this._server.on('message', (msg, rinfo) => {
debug(`server got message from ${rinfo.address}:${rinfo.port}`);
this.emit('message', msg, rinfo.address + (rinfo.port === DefaultBACnetPort ? '' : ':' + rinfo.port));
});
this._server.on('listening', () => {
const address = this._server.address();
debug(`server listening on ${address.address}:${address.port}`);
});
this._server.on('error', (err) => {
debug('transport error', err.message);
this.emit('error', err);
// close is to do by the client.close() which calls the transport.close which calls the _server.close
});
}
getBroadcastAddress() {
return this._settings.broadcastAddress;
}
getMaxPayload() {
return 1482;
}
send(buffer, offset, receiver) {
if (!receiver) receiver = this.getBroadcastAddress();
const [address, port] = receiver.split(':');
this._server.send(buffer, 0, offset, port || DefaultBACnetPort, address);
}
open() {
this._server.bind(this._settings.port, this._settings.interface, () => {
this._server.setBroadcast(true);
});
}
close() {
this._server.close();
}
}
module.exports = Transport;