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examples: one runnable file per recipe on the 2.0 API, the 1.x files in examples/legacy

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Ten recipes: lamp, colour lamp, thermostat, blind, lock (deferred), contact
sensor (ChangeReport), scene, doorbell (raise), typed errors, and a plug as an
ES module. Each reads ALEX2MQTT_USERNAME, _PASSWORD and _ROOT_TOPIC and names
the ones that are missing. The nine examples of 1.5.2 move to examples/legacy
unchanged.

test/examples.test.js starts every file with node, its broker connection sent
to a broker on 127.0.0.1 (test/helpers/loopback.js), discovers the device,
sends directives and checks the answers. A legacy file is started and its
discovery compared with the answer the 1.5.2 build gave, recorded in
test/fixtures/legacy-examples.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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David 2026-09-28 21:38:07 +00:00
parent 2cbcde563e
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82
examples/ExamplePowerController.js
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// Import the library ("alex2node" is the installed package; inside this checkout it resolves to the built dist/ via package.json "exports")
const {
Alex2MQTT,
AlexaInterfaceType,
PowerController,
EndpointHealth
} = require("alex2node");
require("dotenv").config(); // Load environment variables from .env file
// Simulated in-memory device state (used for example/demo purposes)
let outputState = PowerController.OFF; // Initialize the power state to OFF
// Load MQTT connection credentials and root topic from environment variables
const username = process.env.MQTT_USERNAME;
const password = process.env.MQTT_PASSWORD;
const rootTopic = process.env.MQTT_ROOT_TOPIC;
// Create and initialize a new Alexa-to-MQTT client
const alex2NodeClient = new Alex2MQTT(username, password, rootTopic, false);
alex2NodeClient.connect(); // Connect to the MQTT broker
alex2NodeClient.on("error", (e) => console.error("broker:", e.message)); // Log broker errors (on 1.5.0 this listener is also what keeps an outage from killing the process)
// Define the device name (bedroom light)
const deviceName = "Bedroom Light";
// Register the device with a unique endpoint ID (unique per root topic, e.g. "bedroom-light-1")
const bedroomLight = alex2NodeClient.registerDevice(deviceName, "bedroom-light-1");
// Add the PowerController capability (for turning on/off the device)
bedroomLight.addCapability(AlexaInterfaceType.POWER_CONTROLLER);
// Log the device name to verify registration
console.log(bedroomLight.getName());
/**
* Handle Alexa's ReportState directive.
* This occurs when Alexa queries the current state of the device (e.g., during routines or device status checks).
*/
bedroomLight.on("ReportState", (payload) => {
console.log("ReportState received!", payload);
const { correlationToken } = payload.header;
const status = bedroomLight.getStatusMessage(correlationToken);
status
.addHealthProp(EndpointHealth.OK) // Device is healthy
.addPowerControllerProp(outputState); // Report the current power state (ON/OFF)
status.send(); // Send the state report back to Alexa
});
/**
* Handle incoming control directives (e.g., TurnOn, TurnOff).
* These directives come from Alexa when a user issues a command.
*/
bedroomLight.on("Event", (directive, interfaceType) => {
console.log("Event received", { directive, interfaceType });
// Ensure the interfaceType is either PowerController or other valid interfaces
if (interfaceType === AlexaInterfaceType.POWER_CONTROLLER) {
const name = directive.header.name;
const token = directive.header.correlationToken;
// Update the internal state based on the command (TurnOn / TurnOff)
if (name === "TurnOn") {
outputState = PowerController.ON;
console.log("Turning ON the Bedroom Light");
} else if (name === "TurnOff") {
outputState = PowerController.OFF;
console.log("Turning OFF the Bedroom Light");
}
// Respond to the directive with the updated device status
const status = bedroomLight.getStatusMessage(token, true);
status
.addHealthProp(EndpointHealth.OK)
.addPowerControllerProp(outputState)
.send();
}
});