node_helper.js

const NodeHelper = require("node_helper");
const request = require("request");
const Log = require("../../js/logger.js");

module.exports = NodeHelper.create({
    start: function () {
        Log.log("Starting node helper for: " + this.name);
        this.config = null;
    },

    socketNotificationReceived: function (notification, payload) {
    if (notification === "SET_CONFIG") {
        this.config = payload;
    }
    this.getData();
    },

    getData: function () {
        const self = this;
        Log.info(this.name + ": Fetching data for Hong Kong Observatory");

        const nineDayWeatherForecastURL = "https://data.weather.gov.hk/weatherAPI/opendata/weather.php?dataType=fnd&lang=en";

        request(nineDayWeatherForecastURL, function (error, response, body) {
            if (error || response.statusCode !== 200) {
                Log.debug(this.name + " :Error getting 9-day Weather Forecast(" + response.statusCode + ")");
                self.sendSocketNotification("ERROR", response.statusCode);
                return;
            }

            const generalSituation = JSON.parse(body).generalSituation;
            const weatherForecast = JSON.parse(body).weatherForecast;
            const updateTime = JSON.parse(body).updateTime;

            self.sendSocketNotification("DATA", {
                generalSituation: generalSituation,
                weatherForecast: weatherForecast,
                updateTime: updateTime
            });
        });
        setTimeout(this.getData.bind(this), this.config.updateInterval);
    }
});