Control a water heater and ground source heat pump based on cheap hours of spot priced electricity

Tutorials & Examples Solutions
113

Hi,

I already upgraded the script so you can have it here…

/**
 * Javascript module for reading weather data from FMI API - HARMONIE.
 *
 * Copyright (c) 2022 Markus Sipilä, Updated for HARMONIE Rainer Keto
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/**
 * Exports.
 */
module.exports = {
    getForecast: getForecast,
};

/**
 * Reads the weather forecase from FMI API.
 *
 * @param string place
 *   Place recoginzed by FMI API.
 *
 * @return string
 *   XML response from FMI API.
 */
function getForecast(place) {
    const xml = makeApiCall(place);
    const points = preparePoints(xml);
    return points;
}

/**
 * Makes an API call to the Finnish Meteorology Institute.
 *
 * @param string place
 *   Place recoginzed by FMI API.
 *
 * @return string
 *   XML response from FMI API.
 */
function makeApiCall(place) {
    const http = Java.type("org.openhab.core.model.script.actions.HTTP");
    console.log('fmi.js: Making an API call to FMI API...');
    const url = 'http://opendata.fmi.fi/wfs?service=WFS&version=2.0.0&request=getFeature&storedquery_id=fmi::forecast::harmonie::surface::point::simple&place=' + place + '&parameters=temperature';
    const xml = http.sendHttpGetRequest(url, 10000);
    return xml;
}

/**
 * Parses the forecasted temperatures from the XML response.
 *
 * @param string xml
 *   FMI response in XML format.
 *
 * @return array
 *   Array of point objects.
 */
function preparePoints(xml) {
    console.log('fmi.js: transforming XML to JSON and parsing temperatures...');
    const transformation = Java.type("org.openhab.core.transform.actions.Transformation");
    let tempPoints = [];

    // Early exit in case XML is null.
    if (xml == null) {
	console.error('fmi.js: XML empty, parsing aborted.')
	return tempPoints;
    }
    try {
	const jsObject = JSON.parse(transformation.transform('XSLT', 'xml2json.xsl', xml));
	const members = jsObject['wfs:FeatureCollection']['wfs:member'];
	for (let i = 0; i < members.length; i++) {
		    let point = {
			datetime: members[i]['BsWfs:BsWfsElement']['BsWfs:Time'],
			value: members[i]['BsWfs:BsWfsElement']['BsWfs:ParameterValue']
		    };
		    tempPoints.push(point);
	}
	console.log('fmi.js: Temperatures parsed!');
    }
    catch (exception) {
	console.error('fmi.js: Exception parsing temperatures: ' + exception.message);
    }

    return tempPoints;
}
1 Like