WiFi MQTT Subscribe

The block outputs 1 if the client receives a new message since the last sample time. Otherwise, the block outputs 0.

Data Types: Boolean

The block outputs the message received from the MQTT broker as an array of ASCII characters.

Data Types: uint8

The block outputs ASCII values corresponding to the topic name of the received message. For example, if the topic of the received message is model/data, the port outputs the topic as 109 111 100 101 108 47 100 97 116 97.

To convert the ASCII values into their alphanumeric equivalent, attach an ASCII to String block to the output of the topic port. A topic can have a maximum of 128 characters. For information on topics and their structure, see Topics in MQTT.

Dependencies

To enable this port, include a wildcard entry in the Topic parameter. For more information on wildcards in MQTT, see Wildcards in MQTT Topics.

Data Types: uint8

Specify a topic to which the client subscribes. A topic can have a maximum of 128 characters. For information on topics and their structure, see Topics in MQTT.

Specify the length of the data you want to receive at each sample time.

Select this option to print the response from the MQTT broker on the Arduino serial port for each publish request.

Specify how often the client checks for a new message from the broker. When you specify the sample time as -1, the block inherits its sample time based on the context of the block within the model.