1. MQTT – Accessing MQ from anywhere
Srihari Kulkarni 13 April 2011
MQTT – Accessing MQ from anywhere

2. What is MQTT ? A way to obtain real world data
Information is gathered by an increasing number of sensors and devices deployed all over
A way to provide real time information
E.g. Locate an item in a supply chain
Accurate current load of a any system (e.g. electricity meters)
Current status of a system (level of liquid in a container, temperature, pressure etc.)
A way to connect all the devices and sensors directly to your messaging infrastructure

3. What is MQTT ? MQTT = MQ Telemetry Transport
Lightweight messaging protocol designed for sensors and devices with
Flaky network connectivity
Low computing power
Connections where bandwidth is at a premium
Protocol specification is open source
MQTT is nearly 10 years old
Mature and evolving

4. MQTT and WebSphere MQ
WebSphere MQ is a leading messaging middleware product encompassing support for 80 platform configurations – previously server and desktop platforms.
Starting v , WebSphere MQ forays into the realm of devices and sensors
MQTT clients can directly connect to WebSphere MQ
Windows
32 and 64 bit
Linux
64-bit

5. Features of MQTT Publish and subscribe to topics
3 qualities of service
0 Best effort to deliver a message
1 Deliver atleast once
2 Deliver exactly once
Supports Retained publications
Minimal transport overhead to reduce network traffic
As little as 2 bytes
Last Will and Testament

6. WebSphere MQ Extended Reach (MQXR)
What is MQXR ?
Introduced in WebSphere MQ
Implemented as a listener running on a queue manager
Listens to connections from MQTT clients
Implemented in Java
Runs as an MQ service
Interoperability with JMS, MQI and (of course) other MQTT clients
Use MQTT with MQ Explorer
Queue manager can send messages to clients too

7. WebSphere MQ Extended Reach (MQXR)- Security
Username and password as part of CONNECT action
JAAS authentication
SSL and plain text communication over TCP/IP
SSL is not very kind on the network !
MQTT Client
MQXR
Queue
manager
Username/password
Username/password
Replied with
Yes/No
JAAS module

8. WebSphere MQ Extended Reach (MQXR) configuration
Configuration files in <MQ_Install_Path>/mqxr/config
jaas.config
mqxr_win.properties / mqxr_unix.properties
trace.config
WebSphere MQ Explorer UI

9. MQTT Clients C clients Java clients Java SE client OSGi
Java ME / MIDP 2.0
MQTT Daemon
MQTT listener and bridge
Concentrator
Gateway to WebSphere MQ
Write your own !

10. MQTT – Real world example #1
WebSphere Business Events
Collate and Analyze
WebSphere MQ
WebSphere Business Monitor