@ REJ_INVTID
reject, reason: invalid topic ID
 
@ REJ_CONG
reject, reason: congestions
 
@ REJ_NOTSUP
reject, reason: operation not supported
 
@ WILLTOPICRESP
will topic update response
 
@ ADVERTISE
advertise message
 
@ PUBREC
publish complete (QoS 2)
 
@ DISCONNECT
disconnect message
 
@ WILLTOPICUPD
will topic update request
 
@ WILLMSGRESP
will topic update response
 
@ WILLMSGUPD
will message update request
 
@ REGACK
topic registration acknowledgment
 
@ UNSUBACK
unsubscription acknowledgment
 
@ WILLMSGREQ
will message request
 
@ UNSUBSCRIBE
unsubscribe message
 
@ CONNACK
connection acknowledgment message
 
@ SEARCHGW
search gateway message
 
@ WILLTOPICREQ
will topic request
 
@ SUBSCRIBE
subscribe message
 
@ SUBACK
subscription acknowledgment
 
@ PUBCOMP
publish received (QoS 2)
 
@ REGISTER
topic registration request
 
@ PUBREL
publish release (QoS 2)
 
@ GWINFO
gateway info message
 
@ PUBACK
publish acknowledgment