this.grantedQoSLevels = new HashMap<>(); LOG.info("CONNACK [{}] to MQTT client {} at {}", CONNECTION_ACCEPTED.ordinal(), clientIdentifier, this.remoteAddress); LOG.error("CONNACK [{}] to MQTT client {} at {}", CONNECTION_REFUSED_SERVER_UNAVAILABLE.ordinal(), clientIdentifier, this.remoteAddress); LOG.info("CONNACK [{}] to MQTT client {} at {}", code.ordinal(), clientIdentifier, this.remoteAddress);