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# What's MQTT

MQTT stands for MQ Telemetry Transport. It is a publish/subscribe, extremely simple and lightweight messaging protocol, designed for constrained devices and low-bandwidth, high-latency or unreliable networks. The design principles are to minimise network bandwidth and device resource requirements whilst also attempting to ensure reliability and some degree of assurance of delivery. These principles also turn out to make the protocol ideal of the emerging “machine-to-machine” (M2M) or “Internet of Things” world of connected devices, and for mobile applications where bandwidth and battery power are at a premium.

# How To Start

# Install MQTT Broker

# Testing with brokers

We use the free software mosquitto (opens new window) to testing. A GUI MQTT client -- MQTTBox (opens new window)

mosquitto_sub -h mqtt.bconimg.com -t "/beacons"

  • Use the command line to check if MQTT broker works well. You will see "Hello World" at previous command line window if broker works.

mosquitto_pub -h mqtt.bconimg.com -t "/beacons" -m "Hello World"

# How to write my own MQTT subscriber?

Please check How to write my own MQTT client