Wireshark · Display Filter Reference: MQ Telemetry Transport Protocol

Field name	Description	Type	Versions
mqtt.auth.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.clientid	Client ID	Character string	1.12.0 to 4.4.2
mqtt.clientid_len	Client ID Length	Unsigned integer (16 bits)	2.4.0 to 4.4.2
mqtt.conack.flags	Acknowledge Flags	Unsigned integer (8 bits)	2.4.0 to 4.4.2
mqtt.conack.flags.reserved	Reserved	Boolean	2.4.0 to 4.4.2
mqtt.conack.flags.sp	Session Present	Boolean	2.4.0 to 4.4.2
mqtt.conack.val	Return Code	Unsigned integer (8 bits)	1.12.0 to 4.4.2
mqtt.conflag.cleansess	Clean Session Flag	Boolean	1.12.0 to 4.4.2
mqtt.conflag.passwd	Password Flag	Boolean	1.12.0 to 4.4.2
mqtt.conflag.qos	QoS Level	Unsigned integer (8 bits)	1.12.0 to 4.4.2
mqtt.conflag.reserved	(Reserved)	Boolean	1.12.0 to 4.4.2
mqtt.conflag.retain	Will Retain	Boolean	1.12.0 to 4.4.2
mqtt.conflag.uname	User Name Flag	Boolean	1.12.0 to 4.4.2
mqtt.conflag.willflag	Will Flag	Boolean	1.12.0 to 4.4.2
mqtt.conflags	Connect Flags	Unsigned integer (8 bits)	1.12.0 to 4.4.2
mqtt.connack.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.disconnect.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.dupflag	DUP Flag	Boolean	1.12.0 to 4.4.2
mqtt.hdr_reserved	Reserved	Unsigned integer (8 bits)	2.4.3 to 4.4.2
mqtt.hdrflags	Header Flags	Unsigned integer (8 bits)	1.12.0 to 4.4.2
mqtt.illegal_topic_length	Length cannot be 0	Label	3.4.0 to 4.4.2
mqtt.kalive	Keep Alive	Unsigned integer (16 bits)	1.12.0 to 4.4.2
mqtt.len	Msg Len	Unsigned integer (64 bits)	1.12.0 to 4.4.2
mqtt.msg	Message	Byte sequence	1.12.0 to 4.4.2
mqtt.msg_decoded_as	Message decoded as	Character string	2.6.0 to 4.4.2
mqtt.msg_text	Message	Character string	3.2.0 to 4.4.2
mqtt.msgid	Message Identifier	Unsigned integer (16 bits)	1.12.0 to 4.4.2
mqtt.msgtype	Message Type	Unsigned integer (8 bits)	1.12.0 to 4.4.2
mqtt.passwd	Password	Character string	1.12.0 to 4.4.2
mqtt.passwd_len	Password Length	Unsigned integer (16 bits)	2.4.0 to 4.4.2
mqtt.prop_key	Key	Character string	2.6.0 to 4.4.2
mqtt.prop_key_len	Key Length	Unsigned integer (32 bits)	2.6.0 to 4.4.2
mqtt.prop_max_qos_value	QoS	Unsigned integer (8 bits)	2.6.0 to 3.2.18
mqtt.prop_number	Value	Unsigned integer (32 bits)	2.6.0 to 4.4.2
mqtt.prop_string	Value	Character string	2.6.0 to 4.4.2
mqtt.prop_string_len	Length	Unsigned integer (32 bits)	2.6.0 to 4.4.2
mqtt.prop_unknown	Unknown Property	Character string	2.6.0 to 4.4.2
mqtt.prop_value	Value	Character string	2.6.0 to 4.4.2
mqtt.prop_value_len	Value Length	Unsigned integer (32 bits)	2.6.0 to 4.4.2
mqtt.properties	Properties	Label	2.6.0 to 4.4.2
mqtt.property.content_type	Content Type	Character string	3.4.0 to 4.4.2
mqtt.property.max_qos	QoS	Unsigned integer (8 bits)	3.4.0 to 4.4.2
mqtt.property.topic_alias	Topic Alias	Unsigned integer (16 bits)	3.4.0 to 4.4.2
mqtt.property_id	ID	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.property_len	Total Length	Unsigned integer (64 bits)	2.6.0 to 4.4.2
mqtt.proto_len	Protocol Name Length	Unsigned integer (16 bits)	2.4.0 to 4.4.2
mqtt.protoname	Protocol Name	Character string	1.12.0 to 4.4.2
mqtt.puback.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.pubcomp.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.pubrec.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.pubrel.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.qos	QoS Level	Unsigned integer (8 bits)	1.12.0 to 4.4.2
mqtt.retain	Retain	Boolean	1.12.0 to 4.4.2
mqtt.retain_reserved	Reserved	Unsigned integer (8 bits)	2.4.3 to 4.4.2
mqtt.sub.qos	Requested QoS	Unsigned integer (8 bits)	2.4.0 to 4.4.2
mqtt.suback.id	Granted Qos	Unsigned integer (8 bits)	1.12.0 to 2.2.17
mqtt.suback.qos	Granted QoS	Unsigned integer (8 bits)	2.4.0 to 4.4.2
mqtt.suback.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.subscription_options	Subscription Options	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.subscription_options_nl	No Local	Boolean	2.6.0 to 4.4.2
mqtt.subscription_options_qos	QoS	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.subscription_options_rap	Retain As Published	Boolean	2.6.0 to 4.4.2
mqtt.subscription_options_reserved	Reserved	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.subscription_options_retain	Retain Handling	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.topic	Topic	Character string	1.12.0 to 4.4.2
mqtt.topic_len	Topic Length	Unsigned integer (16 bits)	2.4.0 to 4.4.2
mqtt.unknown_topic_alias	Unknown topic alias	Label	3.4.0 to 4.4.2
mqtt.unknown_version	Unknown version (missing the CONNECT packet?)	Label	3.4.0 to 4.4.2
mqtt.unsuback.reason_code	Reason Code	Unsigned integer (8 bits)	2.6.0 to 4.4.2
mqtt.username	User Name	Character string	1.12.0 to 4.4.2
mqtt.username_len	User Name Length	Unsigned integer (16 bits)	2.4.0 to 4.4.2
mqtt.ver	Version	Unsigned integer (8 bits)	1.12.0 to 4.4.2
mqtt.will_properties	Will Properties	Label	3.0.0 to 4.4.2
mqtt.willmsg	Will Message	Byte sequence	1.12.0 to 4.4.2
mqtt.willmsg_len	Will Message Length	Unsigned integer (16 bits)	2.4.0 to 4.4.2
mqtt.willmsg_text	Will Message	Character string	3.2.0 to 4.4.2
mqtt.willtopic	Will Topic	Character string	1.12.0 to 4.4.2
mqtt.willtopic_len	Will Topic Length	Unsigned integer (16 bits)	2.4.0 to 4.4.2