Milesight EM400-MUD - NB Version; AWS;MQTT Topics; Uplink Data

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5. When the distance is below 20cm or above 80cm, the sensor will send threshold alarm.
ff3e 8c c800 2003 0000 0000
Channel
Type
Value
ff
06 (Set Threshold Alarm)
CTRL: cc=10 001 100
100=below or above
001=standard mode
10=enable threshold dismiss
report
Min: c8 00 => 00 c8 = 200 mm
= 20 cm
Max: 2003 => 03 20 = 800 mm
= 80cm
6. Set the height threshold in parking lot mode as 0.03m.
ff701e00
Channel
Type
Value
ff
70 (Set Height Threshold in
Parking Lot Mode)
1e 00 => 00 1e =30mm =0.03m
7. Set the installation height as 4.5m.
ff779411
Channel
Type
Value
ff
77 (Set Installation Height)
94 11 => 11 94 =4500mm =4.5m
6.2 NB Version
6.2.1 AWS/MQTT Topics
When the device is connected to AWS/MQTT server, the bi-directional communication uses
different topics.
Topic
Content
em/[SN]/status
Receive periodic reports, threshold alarms, etc.
em/[SN]/cmd/update
Send downlink commands
em/[SN]/cmd/update/accepted
Receive success ACK of downlink commands
Note: users need to send downlink command to
enable ACK feature first.
6.2.2 Uplink Data
All data are based on following format (HEX):