node ecolo_virtual_iot_device.js mqttDeviceDemo \
--projectId=ecolo-350814 \
--cloudRegion=asia-east1 \
--registryId=ecolo-registry \
--deviceId=ecolo-electricity-sensor \
--privateKeyFile=rsa_private.pem \
--serverCertFile=roots.pem \
--numMessages=25 \
--algorithm=RS256