rxjs-obd/lib/observables/fromOBD.js

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

import { interval, Observable, Subject } from 'rxjs';
import { defaultOBDWifiConfig } from '../connection';
import { supportedPIDs } from '../internal/operators/supportedPIDs';
import { OBDData } from '../model';
import { OBDEvent } from '../model/OBDEvent';
export const fromOBD = (config = defaultOBDWifiConfig) => new Observable((subscriber) => {
    /**
     * The connection connection to ELM 327 OBD Reader.
     */
    const { pullingInterval, connection } = config;
    /**
     * Last OBD Data emitted.
     */
    let data = new OBDData();
    /**
     * Flag of indicate that a pull loop is running.
     */
    let running = false;
    /**
     * Internal pulling (interval) subscription.
     */
    let subscription;
    /**
     * Subject to observe the pluck moment.
     */
    const subject = new Subject();
    subject.subscribe((value) => {
        data = Object.assign({}, value);
        running = false;
    });
    const dispatchNext = (id, subscriber) => {
        if (!running) {
            running = true;
            subscriber.next(new OBDEvent(id, connection, subject, Object.assign({}, data)));
        }
    };
    connection.open(config).subscribe({
        error: (error) => subscriber.error(error),
        complete: () => {
            // connected
            subscription = interval(pullingInterval).subscribe((id) => dispatchNext(id, subscriber));
        }
    });
    return () => {
        if (!!connection) {
            connection.close();
        }
        if (!!subscription) {
            subscription.unsubscribe();
        }
    };
}).pipe(supportedPIDs('00'), supportedPIDs('20'), supportedPIDs('40'), supportedPIDs('60'), supportedPIDs('80'), supportedPIDs('A0'));
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