Modification of Mosquitto Broker for Delivery of Urgent MQTT Message

This paper proposes a new method to expand the functions of the MQTT so that it may transmit urgent messages first. The Mosquitto, the widely used as a standard MQTT broker has been chosen and modified in order to create a “U-Mosquitto” broker capable of processing urgent messages. Several experiments have been conducted to verify the performance of the U-Mosquitto. Having analyzed the delivery time of the messages, it was observed that the more publishers, urgent messages were delivered faster than normal messages under U-Mosquitto broker.