@ModuleOption("the topic(s) (comma-delimited) to which the source will subscribe")
	public void setTopics(String topics) {
		this.topics = topics;
	}
Describes options to the {@code mqtt} source module.

@author Eric Bottard
@author Gary Russell
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/modules/metadata/MqttSourceOptionsMetadata.java