`MqttSubscribe` (FB)

FUNCTION_BLOCK MqttSubscribe EXTENDS AbbETrig3

subscribe to a topic on an already established connection to an MQTT broker

InOut:

Scope	Name	Type	Initial	Comment
Input	`Conn`	POINTER TO MQTT_CONNECTION	0	Pointer to valid connection struct created by MqttConnect
	`Topic`	`STRING(Constants.MQTT_MAX_TOPIC_LEN)`	Defaults.MQTT_DEFAULT_EMPTY	Topic name as a string. See the description at the top. For further information see the MQTT specification.
	`MaxQos`	MQTT_QOS	MQTT_QOS.QOS_0	Signals the server which is the highest QoS level which can be handled. Can be reduced to relieve the client from high network load.
Output	`ErrorID`	ERROR_ID	ERROR_ID.MQTT_ERR_NO_ERROR	Error code description

MqttSubscribe (FB)