readAndCallSonos.js

"use strict";

// #############
// Reads data from tag and tries to call Sonos API with spotify URI from tag
// #############

import { NFC, CONNECT_MODE_DIRECT } from '../src/index';
import pretty from './pretty-logger';

const request = require('request');

const nfc = new NFC(); // const nfc = new NFC(pretty); // optionally you can pass logger to see internal debug logs

nfc.on('reader', async reader => {

	// enable when you want to auto-process ISO 14443-4 tags (standard=TAG_ISO_14443_4)
    reader.aid = 'F222222222';
    
    // Disable beeper :)
    try {
		await reader.connect(CONNECT_MODE_DIRECT);
		await reader.setBuzzerOutput(false);
		await reader.disconnect();
	} catch (err) {
		pretty.info(`initial sequence error`, reader, err);
	}

	reader.on('card', async card => {

		// example reading 36 bytes assuming containing 16bit integer
		try {

			// reader.read(blockNumber, length, blockSize = 4, packetSize = 16)
			// - blockNumber - memory block number where to start reading
			// - length - how many bytes to read
			// - blockSize - 4 for MIFARE Ultralight, 16 for MIFARE Classic
			// ! Caution! length must be divisible by blockSize (we have to read the whole block(s))

			// Read 36 bytes from the album tag, which is the exact length in bytes of:
			// spotify:album:2dfTV7CktUEBkZCHiB7VQB
			const data = await reader.read(4, 36);

			pretty.info(`data read`, reader, data);

            const payload = bufferToString(data);
            sendRequestToSonos(payload);

			pretty.info(`data converted`, reader, payload);

		} catch (err) {
			pretty.error(`error when reading data`, reader, err);
		}

	});

	reader.on('error', err => {
		pretty.error(`an error occurred`, reader, err);
	});

	reader.on('end', () => {
		pretty.info(`device removed`, reader);
	});


});

nfc.on('error', err => {
	pretty.error(`an error occurred`, err);
});

function bufferToString(buffer) {

    return buffer.toString('utf8');

}

function sendRequestToSonos(musicRequestParameters) {
	let sonosRoomName = "Living%20Room";

    request('http://localhost:5005/' + sonosRoomName + '/spotify/now/' + musicRequestParameters, { json: true }, (err, res, body) => {
        if (err) { 
            pretty.error("Error while sending request to sonos", err);
        }

        pretty.info("Response received from sonos API", body);
    });
}