User's Manual

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uplink messages.
3~0
LENGTH
M(1~15)
The number of scanned beacons in this message.
That means in one message, at most 15 beacons can
be transmitted. If there’re more than 15 beacons,
they’ll be transmitted 15 by 15. In one second,
about 100 beacons can be scanned by the Device.
MAJOR field
Bit
Name
Value
Description
15~0
MAJOR
short
Major of BLE beacon.
MINOR field
Bit
Name
Value
Description
15~0
MINOR
short
Minor of BLE beacon.
RSSI field
Bit
Name
Value
Description
7~0
RSSI
byte
Received Signal Strength Indication of the beacon,
the server utilizes it to calculate the distance.
(unit: -1dBm)
TOFF field
Bytes
Name
Value
Description
N
TMOFF
Time offset means the delta between the time every
beacon scanned and the time message sent.
N = (M+1) / 2
Byte0: bit7 bit6 bit5 bit4 | bit3 bit2 bit1 bit0
Beacon0 | Beacon1
Byte1: bit7 bit6 bit5 bit4 | bit3 bit2 bit1 bit0
Beacon2 | Beacon3
…
Example: If there’s 4 beacons in the message, then
M will be 4, and N will be 2. Suppose the message is
sent at 15:04:27, the beacon1 is scanned at
15:04:25, beacon2 at 15:04:23, beacon3 at
15:04:26, beacon4 at 15:04:27, then TMOFF should
be 0x2410.
This field is designed for precise positioning, if
a beacon is scanned by multi Devices at the
same time, the server can calculate the distance
between the beacon and Devices, then
calculate the position of the beacon.
C256U-PQ User Manual