en_qos_choices

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This enum has the following members:

0- QOS_AT_MOST_ONCE

1- QOS_AT_LEAST_ONCE

2- QOS_EXACTLY_ONCE

Hivemq.com has an excellent explanation of the MQTT quality of service levels:

http://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels.