MQTT的初步理解

对MQTT的理解,以下无论是Client给Sever,或者Serve给Client都会调用一下某几个包CONNECT/CONNACK/PUBLISH/PUBACK/PUBREC/PUBREL/PUBCOMP/SUBSCRIBE/SUBACK/UNSUBSCRIBE/UNSUBACK/PINGREQ/PINGRESP/DISCONNECT/Reserved