example-then.device.nut

// MIT License
//
// Copyright 2020-23 KOIRE Wireless
// Copyright 2016-19 Electric Imp
//
// SPDX-License-Identifier: MIT
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/**
 * In this example small application for a smart weather station.
 * It reads temperature data from sensor and send it to agent.
 * Example of serial execution using chain of then() handlers.
 *
 * NOTE: this code should be run on device side only!
 */

#require "Promise.lib.nut:4.0.1"

const MAX = 100;

// generating random number as device id, returning as promise
function initSensor() {
    return Promise(function(resolve, reject) {
        local deviceId = math.rand() % MAX;
        resolve(deviceId);
    });
}

// generating some random float value as temperature
function readData(sensor) {
    local temp = math.rand() % MAX + 0.1;
    return temp;
}

initSensor()
.then(function(sensorId){
    return readData(sensorId);
})
.then(function(temp) {
    agent.send("temp", temp);
})
.fail(function(err) {
    server.log("Unexpected error: " + err);
});