Analog output.
Subscribe to the status code.
0: Block is not triggered
1: There are no free subscription channels (maximum 8 subscription blocks).
2: Wait for the MQTT server to connect or wait for the subscription channel to be idle.
6: Sending a subscription request
16: The subscription request is successful, waiting to receive the topic of the subscription.
26: Received a topic subscribed to by this block
36: Subscription request failed, waiting for the block subscription timeout
8: Unsubscribe
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