How to use the azure-iot-device.ModuleClient function in azure-iot-device

// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

'use strict';

var Protocol = require('azure-iot-device-mqtt').Mqtt;
var ModuleClient = require('azure-iot-device').ModuleClient;

ModuleClient.fromEnvironment(Protocol, function (err, client) {
  if (err) {
    console.error("Could not create client: " + err.toString());
    process.exit(-1);
  } else {
    console.log('got client');

    client.on('error', function (err) {
      console.error(err.message);
    });

    // connect to the edge instance
    client.open(function (err) {
      if (err) {
        console.error('Could not connect: ' + err.message);

// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

'use strict';

var ModuleClient = require('azure-iot-device').ModuleClient;
var Protocol = require('azure-iot-device-mqtt').Mqtt;

ModuleClient.fromEnvironment(Protocol, function (err, client) {
  if (err) {
    console.error("Could not create client: " + err.toString());
    process.exit(-1);
  } else {
    console.log('got client');

    client.on('error', function (err) {
      console.error(err.message);
    });

    // connect to the edge instance
    client.open(function(err) {
      if (err) {

// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

'use strict';

var Protocol = require('azure-iot-device-mqtt').Mqtt;
var ModuleClient = require('azure-iot-device').ModuleClient;
var Message = require('azure-iot-device').Message;

ModuleClient.fromEnvironment(Protocol, function (err, client) {
  if (err) {
    console.error("Could not create client: " + err.toString());
    process.exit(-1);
  } else {
    console.log('got client');

    client.on('error', function (err) {
      console.error(err.message);
    });

    client.open(function (err) {
      if (err) {
        console.error('Could not connect: ' + err.message);

// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

'use strict';

var Protocol = require('azure-iot-device-mqtt').Mqtt;
var Client = require('azure-iot-device').ModuleClient;
var Message = require('azure-iot-device').Message;
var fs = require('fs');

var connectionString = process.env.EdgeHubConnectionString;

var client = Client.fromConnectionString(connectionString, Protocol);
console.log('got client');

client.on('error', function (err) {
  console.error(err.message);
});

client.setOptions({
  ca: fs.readFileSync(process.env.EdgeModuleCACertificateFile).toString('ascii')
}, function(err) {
  if (err) {

// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
'use strict';
/*jshint esversion: 6 */

var ModuleClient = require('azure-iot-device').ModuleClient;
var Message = require('azure-iot-device').Message;
var debug = require('debug')('azure-iot-e2e:node')
var glueUtils = require('./glueUtils');
var NamedObjectCache = require('./NamedObjectCache');

/**
 * cache of objects.  Used to return object by name to the caller.
 */
var objectCache = new NamedObjectCache();

/**
 * Create an event handler which calls the callback for the second event only.  Used
 * like EventEmitter.Once(), only it returns the second event and then removes itself.
 * This is needed for 'properties.desired' events because the first event comes when
 * registering for the hander, but in many cases, we want the second event which is
 * an actual delta.

'use strict';


var ModuleClient = require('azure-iot-device').ModuleClient;
var Mqtt = require('azure-iot-device-mqtt').Mqtt;

ModuleClient.fromEnvironment(Mqtt, (err, client) => {
    if (err) {
        console.error(err.toString());
        process.exit(-1);
    } else {
        client.invokeMethod('pierreca-edge-test', 'methodTarget', {
            methodName: 'doSomethingInteresting',
            payload: 'foo',
            responseTimeoutInSeconds: 5,
            connectTimeoutInSeconds: 2
        }, (err, resp) => {
            if (err) {
                console.error(err.toString());
                process.exit(-1);