How to use the azure-iot-provisioning-device-mqtt.Mqtt function in azure-iot-provisioning-device-mqtt

async function main() {
  const provisioningClient = ProvisioningDeviceClient.create(
    provisioningEndpoint,
    idScope,
    new ProvisioningTransport(),
    new SymmetricKeySecurityClient(registrationId, symmetricKey)
  );

  // IoT Central requires a special payload to be sent when the device is provisioned
  provisioningClient.setProvisioningPayload({
    '__iot:interfaces': {
      CapabilityModelId: capabilityModel
    }
  });

  const registrationResult = await provisioningClient.register();
  const deviceConnectionString = `HostName=${registrationResult.assignedHub};DeviceId=${registrationResult.deviceId};SharedAccessKey=${symmetricKey}`;

  const propertyUpdateHandler = (interfaceInstance, propertyName, reportedValue, desiredValue, version) => {
    console.log('Received an update for ' + propertyName + ': ' + JSON.stringify(desiredValue));
    interfaceInstance[propertyName].report(desiredValue, {

//
// You can find your idScope in the portal overview section for your dps instance.
//
var idScope = process.env.PROVISIONING_IDSCOPE;

//
// The registration id of the device to be registered.
//
var registrationId = process.env.PROVISIONING_REGISTRATION_ID;

var symmetricKey = process.env.PROVISIONING_SYMMETRIC_KEY;

var provisioningSecurityClient = new SymmetricKeySecurityClient(registrationId, symmetricKey);

var provisioningClient = ProvisioningDeviceClient.create(provisioningHost, idScope, new ProvisioningTransport(), provisioningSecurityClient);
// Register the device.
provisioningClient.setProvisioningPayload({a: 'b'});
provisioningClient.register(function(err, result) {
  if (err) {
    console.log("error registering device: " + err);
  } else {
    console.log('registration succeeded');
    console.log('assigned hub=' + result.assignedHub);
    console.log('deviceId=' + result.deviceId);
    console.log('payload=' + JSON.stringify(result.payload));
    var connectionString = 'HostName=' + result.assignedHub + ';DeviceId=' + result.deviceId + ';SharedAccessKey=' + symmetricKey;
    var hubClient = Client.fromConnectionString(connectionString, iotHubTransport);

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

//
// You can find your idScope in the portal overview section for your dps instance.
//
const idScope = process.env.PROVISIONING_IDSCOPE;

//
// The registration id of the device to be registered.
//
const registrationId = process.env.PROVISIONING_REGISTRATION_ID;

const symmetricKey = process.env.PROVISIONING_SYMMETRIC_KEY;

let provisioningSecurityClient = new SymmetricKeySecurityClient(registrationId, symmetricKey);

let provisioningClient = ProvisioningDeviceClient.create(provisioningHost, idScope, new ProvisioningTransport(), provisioningSecurityClient);
// Register the device.
provisioningClient.setProvisioningPayload({a: 'b'});
provisioningClient.register((err, result) => {
  if (err) {
    console.log('error registering device: ' + err);
  } else {
    console.log('registration succeeded');
    console.log('assigned hub=' + result.assignedHub);
    console.log('deviceId=' + result.deviceId);
    console.log('payload=' + JSON.stringify(result.payload));
    let connectionString = 'HostName=' + result.assignedHub + ';DeviceId=' + result.deviceId + ';SharedAccessKey=' + symmetricKey;
    let hubClient = Client.fromConnectionString(connectionString, iotHubTransport);

    hubClient.open((err) => {
      if (err) {
        console.error('Could not connect: ' + err.message);