||Disconnect from the currently connected MQTT Broker
The PLC can only connect to one MQTT broker at a time. If for any reason it needs to switch broker,
it must first disconnect from the currently connected broker using this command,
then run the MQTT_CONNECT command
again to connect to a different broker.
MQTT_STATUS(1) will return a '2' indicating that the operation is successful.
MQTT_STATUS(2) will return a '0' when the PLC has been disconnected from the broker.
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