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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212 Building Smarter Planet Solutions with MQTT and IBM WebSphere MQ Telemetry
B.1 MQTT concepts
In this section we describe the following concepts of the MQ Telemetry Transport protocol:
Quality of service levels and flows
QoS determination
QoS Impact on performance
Client identifier
Durable and non-durable subscribers with MQTT
Understanding MQTT persistence
Message overhead
Keep alive handling
Retry message delivery
Last will and testament
Retained Flag on Messages
TCP/IP overhead
Message format
Command messages
B.1.1 Quality of service levels and flows
Quality of service (QoS) levels should be understood by every user of MQTT. A QoS value
determines how each message will be delivered and must be specified for every message ...
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