libpaho-mqtt

C client library for connecting to MQTT message brokers

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Eclipse Paho C client library for MQTT

publish a message to an mqtt broker$ mosquitto_pub -h broker.mqtt.cool -t test/topic -m 'Hello MQTT'

subscribe to messages from an mqtt topic$ mosquitto_sub -h broker.mqtt.cool -t test/topic

write c code that connects to mqtt broker$ gcc -o mqtt_client client.c -lpaho-mqtt3c

send mqtt message with username and password authentication$ mosquitto_pub -h broker.mqtt.cool -u user -P pass -t sensor/temp -m '25.5'

check installed mqtt library version and location$ pkg-config --modversion libpaho-mqtt && pkg-config --cflags --libs libpaho-mqtt