Unsubscribe method

Unsubscribes from an MQTT topic.
Syntax
retCode
 =
mqttClient
.
Unsubscribe
(unSubOption As
MQTTUnsubscribeOption
)
where
retCode
 - is a constant of the MqttUnsubscriptionCode object.
mqttClient
 - is an MQTTClient object created by the MQTTFactory object's method
CreateClient
.
Example
Dim retCode As MqttUnsubscriptionCode
Dim unSubOption As MQTTUnsubscribeOption

Set unSubOption = mqttClient.CreateUnsubscribeOption
unSubOption.Topic = "Topic"
retCode = mqttClient.Unsubscribe(unSubOption)
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