You left out the part where the Zigbee packet bounces off a feather which trips a switch which closes a circuit which engages a solenoid which rotates a wheel which drops a few kernels of seed on a plate on top of a pair of scales which a chicken then pecks at which is registered by the scales which trigger another solenoid which pushes the 'open' button on a CD-ROM drive which opens, breaking a laser beam which triggers a paper tape reader which is connected to your coordinator which produces that MQTT message.