Module: mqtt

Module mqtt provides functions for the machine-to-machine (M2M)/"Internet of Things" connectivity protocol. MQ Telemetry Transport (MQTT) uses a publish-subscribe messaging pattern, which requires a message broker to enable the communication between MQTT clients. The broker is responsible for distributing messages to interested clients based on the topic of a message.

This implementation adds automated reconnection in the event of a disconnect, and automatic resubscription to subscribed topics.

Note: This requires libcrypto, libssl, and libmosquitto to be included in the applications LIBRARIES file.

Functions in this module:

Function	Short Description
(make-mqtt . args)	Create and return an MQTT instance
(mqtt-reset t . args)	Reset an MQTT instance
(mqtt-subscribe t topic qos)	Subscribe to an MQTT topic
(mqtt-unsubscribe t topic)	Unsubscribe from an MQTT topic
(mqtt-publish t topic msg qos retain)	Publish an MQTT topic
(mqtt-destroy t)	Destroy an MQTT instance
(mqtt-connected? t)	Check if MQTT instance is connected