Unsubscribe Method
Unsubscribes the component from the specified topic.
Syntax
Remarks
This method unsubscribes the component to the TopicId.
TopicIdType indicates the category of value specified in TopicId and may have the following values:
- 0: Topic name - a full topic name as described in RegisterTopic to be registered by the gateway.
- 1: Pre-defined topic id - id whose mapping to a topic name is known in advance by both the client and the gateway - no registration is necessary.
- 2: Short topic name - has a fixed length of two bytes and is short enough that no registration is necessary. To use one, simply set the correct TopicIdType and set the TopicId to a two-character string.
Unsubscribe Examples
String fullTopicName = "full/topic/name";
mqtt1.Unsubscribe(fullTopicName, 0); // unsubscribe from topic name
mqtt1.Unsubscribe(fullTopicName+"/#", 0); // must use full topic filter if includes wildcard; can't unsubscribe from individual topics included in the filter
mqtt1.Unsubscribe("aa", 2); // unsubscribe from short topic