MQTT is a lightweight publish-subscribe messaging protocol that is suitable for use in internet of things applications. It uses a publish-subscribe pattern where devices can publish messages to topics and other devices can subscribe to receive messages from topics. MQTT supports different levels of quality of service including QoS level 2 which provides for exactly once guaranteed delivery of messages between an MQTT publisher and subscribers. The document discusses MQTT and provides references to books and articles about using MQTT on Intel architectures and with the Eclipse Paho Java client library.

1. MQTT protocol on Intel
IoTArchitecture
GastonC. Hillar
Intel Black Belt Software Developer since 2009
CTO @ Mapgenix - https://www.mapgenix.com/en/
Twitter: @gastonhillar
E-mail: gastonhillar@hotmail.com

2. MQTT v3.1.1: A lightweight protocol suitable
for IoT
IP
TCP
MQTT

3. Publish-Subscribe pattern
iOS Smartphone
Publish 100 feet to topic
“sensor1/altitude”
Android Tablet
Publish 100 feet to topic
“sensor1/altitude”
Publish 100 feet to topic
“sensor1/altitude”
Subscribe to topic
“sensor1/altitude”
Subscribe to topic
“sensor1/altitude”
Broker
Publisher Subscriber
Subscriber
Temperature
sensor wired
to Intel Edison

4. QoS Level 2: Exactly once delivery
MQTT server
MQTT client
Publisher
MQTT client
Subscriber #1
QoS 2
PUBLISH (QoS 2)
PUBREC
PUBREL
PUBCOMP
MQTT client
Subscriber #2
QoS 2

5. My books related to Intel IoT and MQTT
My Java Magazine article related to MQTT and the Eclipset Paho Java Client:
https://www.oracle.com/corporate/features/simple-messaging-with-mqtt.html