Subscribe method

Subscribes to an MQTT topic.
Syntax
retCode
 =
mqttClient
.
Subscribe
(subOption As
MQTTSubscribeOption
)
where
retCode
 - is a constant of the MqttSubscriptionCode object.
mqttClient
 - is an MQTTClient object created by the MQTTFactory object's method
CreateClient
.
Example
Dim retCode As MqttSubscriptionCode
Dim subOption As MQTTSubscribeOption

Set subOption = MqttFactory.CreateSubscribeOption
subOption.QoS = MqttQoS1
subOption.Topic = "Topic"
subOption.Identifier = 1
retCode = mqttClient.Subscribe(subOption)
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