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Setup a custom namespace as shown below:

MQTT Modules for Ignition 8.x > Reading bytes from an incoming binary message > image (46).png

Publish MQTT message
system.cirruslink.transmission.publish("Chariot SCADA", "a/b", [30, 32, 32, 34, 41], 0, False)

Create a Value Changed script on the tag

def valueChanged(tag, tagPath, previousValue, currentValue, initialChange, missedEvents):
    from org.slf4j import LoggerFactory
    from ch.qos.logback.classic import Logger
    from ch.qos.logback.classic import Level
    from ch.qos.logback.classic import LoggerContext as LoggerContext
    logger = system.util.logger("com.cirruslink.test.binarymessageconvert")
    
    newByteArray = bytearray(str(currentValue.value), "ISO-8859-1");
    for b in newByteArray:
        logger.info("Byte: " + str(b))