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most unreliable transfer mode.
QoS 1 – At Least Once
This level guarantees that the message will be delivered at least once,
but may be delivered more than once.
QoS 2 – Exactly Once
QoS 2 is the highest level of service in MQTT. This level guarantees that
each message is received only once by the intended recipients. QoS 2 is
the safest and slowest quality of service level.
(5) Device Payload
EM310-UDL reports basic information of sensor whenever it joins the network.
Channel
Type
Description
ff
01(Protocol Version)
01=>V1
09 (Hardware Version)
01 40 => V1.4
0a (Software Version)
01 14 => V1.14
0b (Power On)
Device is on
0f (Device Type)
00: Class A, 01: Class B, 02: Class C
16 (Device SN)
16 digits
Example:
ff0bff ff0101 ff166713b31056670013 ff090100 ff0a0100 ff0f00
Channel
Type
Value
Channel
Type
Value
ff
0b
(Power On)
ff (Reserved)
ff
01
(Protocol
Version)
01 (V1)
ff
16
(Device SN)
6713b3105667
0013
ff
09
(Hardware
version)
0100 (V1.0)
ff
0a
(Software
version)
0100
(V1.0)
ff
0f
(Device Type)
00
(Class A)