endpoint: <iot_endpoint>
credentialEndpoint: <iot_credential_endpoint>
rootCAFile: AmazonRootCA1.pem
certFile: thing.cert.pem
privateKeyFile: thing.private.key
mqttMode: both
useWebsocket: false
thingName: <iot_thing>
subscribeTopic: <iot_thing>/sub
publishTopic: <iot_thing>/pub
roleAlias: <iot_role_alias>