smart-coffee-machine-client.js

/********************************************************************************
 * Copyright (c) 2022 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the W3C Software Notice and
 * Document License (2015-05-13) which is available at
 * https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document.
 *
 * SPDX-License-Identifier: EPL-2.0 OR W3C-20150513
 ********************************************************************************/
// This is an example of Web of Things consumer ("client" mode) Thing script.
// It considers a fictional smart coffee machine in order to demonstrate the capabilities of Web of Things.
// An accompanying tutorial is available at http://www.thingweb.io/smart-coffee-machine.html.
// Print data and an accompanying message in a distinguishable way
function log(msg, data) {
    console.info("======================");
    console.info(msg);
    console.dir(data);
    console.info("======================");
}
WoT.requestThingDescription("http://127.0.0.1:8080/smart-coffee-machine").then(async (td) => {
    try {
        const thing = await WoT.consume(td);
        log("Thing Description:", td);
        // Read property allAvailableResources
        let allAvailableResources = await (await thing.readProperty("allAvailableResources")).value();
        log("allAvailableResources value is:", allAvailableResources);
        // Now let's change water level to 80
        await thing.writeProperty("availableResourceLevel", 80, { uriVariables: { id: "water" } });
        // And see that the water level has changed
        const waterLevel = await (
            await thing.readProperty("availableResourceLevel", { uriVariables: { id: "water" } })
        ).value();
        log("waterLevel value after change is:", waterLevel);
        // This can also be seen in allAvailableResources property
        allAvailableResources = await (await thing.readProperty("allAvailableResources")).value();
        log("allAvailableResources value after change is:", allAvailableResources);
        // It's also possible to set a client-side handler for observable properties
        thing.observeProperty("maintenanceNeeded", async (data) => {
            log("maintenanceNeeded property has changed! New value is:", await data.value());
        });
        // Now let's make 3 cups of latte!
        const makeCoffee = await thing.invokeAction("makeDrink", undefined, {
            uriVariables: { drinkId: "latte", size: "l", quantity: 3 },
        });
        const makeCoffeep = await makeCoffee?.value();
        if (makeCoffeep.result != null) {
            log("Enjoy your drink!", makeCoffeep);
        } else {
            log("Failed making your drink:", makeCoffeep);
        }
        // See how allAvailableResources property value has changed
        allAvailableResources = await (await thing.readProperty("allAvailableResources")).value();
        log("allAvailableResources value is:", allAvailableResources);
        // Let's add a scheduled task
        const scheduledTask = await thing.invokeAction("setSchedule", {
            drinkId: "espresso",
            size: "m",
            quantity: 2,
            time: "10:00",
            mode: "everyday",
        });
        const scheduledTaskp = await scheduledTask?.value();
        log(scheduledTaskp.message, scheduledTaskp);
        // See how it has been added to the schedules property
        const schedules = await (await thing.readProperty("schedules")).value();
        log("schedules value: ", schedules);
        // Let's set up a handler for outOfResource event
        thing.subscribeEvent("outOfResource", async (data) => {
            // Here we are simply logging the message when the event is emitted
            // But, of course, could have a much more sophisticated handler
            log("outOfResource event:", await data.value());
        });
        // fire property change for maintenanceNeeded
        await thing.writeProperty("servedCounter", 1001);
    } catch (err) {
        console.error("Script error:", err);
    }
});