rxjs-obd/lib/connection/NodeOBDConnection.js

RxJS Implementation for OBD (On Board Diagnostics) of vehicles via ELM 327 connections.

import * as net from 'net';
import { EMPTY, Subject } from 'rxjs';
/**
 * The wrapper net.Socket connection.
 */
export class NodeOBDConnection {
    /**
     * Open connection to OBD Reader.
     * @returns the observable of opening connection.
     */
    open(config) {
        const { port, host } = config;
        const subject = new Subject();
        this.socket = net.connect(port, host, () => {
            this.data$ = new Subject();
            this.socket.on('data', (input) => this.data$.next(input.toString('utf8')));
            subject.complete();
        });
        this.socket.on('error', (error) => subject.error(error));
        return subject.asObservable();
    }
    /**
     * Send a command to OBD Reader.
     * @returns the observable of send operation.
     * The events emitted are ignored, wait for complete (successful) or error (failure).
     */
    send(command) {
        this.socket.write(command);
        return EMPTY;
    }
    /**
     * Listener for data received from OBD Reader.
     * @returns Observable of data received from OBD Reader.
     */
    onData() {
        return this.data$.asObservable();
    }
    /**
     * Close and dispose resources of OBD Reader connection.
     * @returns the observable of close operation.
     * The events emitted are ignored, wait for complete (successful) or error (failure).
     */
    close() {
        this.data$.complete();
        this.socket.end();
        this.socket.destroy();
        return EMPTY;
    }
}
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