Smart Edge Broker for Location-Based Transfer between Services and Distributed Data in IoT Smart Services

Table 1

Smart Edge Broker message definition: QueryReq message.

Header	Byte	Description
Fixed	Byte 1	MQTT control packet type (8)
	Byte 2	Remaining length
Variable	Byte 1	Packet identifier MSB
	Byte 2	Packer identifier LSB
	Byte 3	No properties
Payload	Byte 1	Payload length MSB
	Byte 2	Payload length LSB
	Byte 3… n	Topic filter + query
	Byte n + 1	Subscription options (1)