rxjs-obd/lib/connection/CordovaOBDConnection.js

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

import { EMPTY, Subject } from 'rxjs';
import { OBDConnection } from './OBDConnection';
/**
 * The wrapper of Socket for Cordova plugin Socket For Cordova.
 */
export class CordovaOBDConnection extends OBDConnection {
    /**
     * Open connection to OBD Reader.
     * @returns the observable of opening connection.
     */
    open(config) {
        const { port, host } = config;
        const subject = new Subject();
        this.socket = new Socket();
        this.socket.open(host, port, () => {
            this.data$ = new Subject();
            this.socket.onData = (data) => {
                this.data$.next(CordovaOBDConnection.unmarshall(data));
            };
            subject.complete();
        }, (error) => subject.error(error));
        return subject.asObservable();
    }
    /**
     * Send a command to OBD Reader.
     * @returns the observable of send operation.
     * The events emitted are ignored, wait for complete (successful) or error (failure).
     */
    send(command) {
        const subject = new Subject();
        this.socket.write(CordovaOBDConnection.marshall(command), () => subject.complete(), (error) => subject.error(error));
        return subject.asObservable();
    }
    /**
     * Listener for data received from OBD Reader.
     * @returns Observable of data received from OBD Reader.
     */
    onData() {
        return this.data$.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.shutdownWrite();
        setTimeout(this.socket.close);
        return EMPTY;
    }
    /**
     * Marshall the string data into bytes array.
     * @param data the string data.
     * @returns the bytes array.
     */
    static marshall(data) {
        if (!data) {
            return new Uint8Array(0);
        }
        let bytes = new Uint8Array(data.length);
        for (let i = 0; i < bytes.length; i++) {
            bytes[i] = data.charCodeAt(i);
        }
        return bytes;
    }
    /**
     * Unmarshall the bytes array into data string.
     * @param bytes the bytes array.
     * @returns the string data.
     */
    static unmarshall(bytes) {
        return String.fromCharCode.apply(null, bytes);
    }
}
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