September 2012
Intermediate to advanced
268 pages
8h 7m
English
book
Building Smarter Planet Solutions with MQTT and IBM WebSphere MQ Telemetry
by Valerie Lampkin, Weng Tat Leong, Leonardo Olivera, Sweta Rawat, Nagesh Subrahmanyam, Rong Xiang, Martin Keen
Content preview from Building Smarter Planet Solutions with MQTT and IBM WebSphere MQ Telemetry
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Appendix B. The MQTT protocol 241
2. Then, we have the variable header that is broken up as follows.
a. The first two bytes (3 and 4 in the table) contain the message ID of the message as
0x02 or 2.
3. There is no payload.
B.6 Subscribing
After the client is connected to the server, you can subscribe (see Figure B-16):
1. Set up Wireshark as described in “Set up for tracing” on page 222.
2. In the WMQTT Utility, enter a topic name, such as temperatures/Raleigh.
3. Start the trace as described in B.2, “Connect to the MQTT server” on page 224.
4. Click Subscribe to subscribe to a given topic name.
Figure B-16 Subscribe
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