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Bluetooth DMM 10 Byte Data Protocol
ludwich66 edited this page Jan 18, 2023
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Description (Typ = Multimeter (2)):
BT-DMM Display (2)
Description (Typ = Multimeter (3)):
Display Typ (3)
The 10 bytes of the Bluetooth handle 0009 are decrypted byte by byte with an XOR Operation (only the first 11 bytes used(?)).
The binary byteorder must be changed to Big Endian (LSB → MSB), after the flip it is simpler to decode.
The binary information represents individual display elements.
1. Gatttool to read the payload from the Bluetooth-Multimeter
Replace FC:58:FA:xx:yy:zz with your BT-MAC
gatttool -b FC:58:FA:xx:yy:zz --char-read --listen -a 9
Characteristic value/descriptor:
Notification handle = 0x0009 value: 1b 84 71 55 a2 61 9f fc 66 2a2. Generate the Payload with ab Bytewyse XOR operation
<— scroll —>
Example from Type (1)
Example 10 Byte from Bluetooth-DMM
hex
1b
84
71
55
a2
61
9f
fc
66
2a
key for xor Operation
hex
41
21
73
55
a2
c1
32
71
66
aa
3b
d0
e2
a8
33
14
20
21
aa
bb
Result to Decode
hex
5a
a5
02
00
00
a0
ad
8d
00
80
3. Flip Byteorder to Big Endian:
MSB (xAB)
flip to
<76543210<
>01234567>
10101011
11010101
4. Build the 80 Bit Datastream:
<— scroll —>
Byte
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
4
4
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7
7
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7
7
8
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8
8
8
8
8
8
9
9
9
9
9
9
9
9
Bit LSB→MSB
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Bitsnr
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
Example Value Flip
0
1
0
1
1
0
1
0
1
0
1
0
0
1
0
1
1
1
0
0
0
0
0
0
0
0
1
0
0
1
1
1
1
1
0
1
0
1
1
1
1
1
0
1
0
1
0
1
1
0
1
1
0
1
0
1
1
0
1
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Example Value Flip2
0
1
0
1
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
0
1
1
0
1
0
1
1
0
1
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Display Element
p
p
p
p
p
p
p
p
r
r
r
r
r
r
r
r
Typ
Typ
e
e
e
e
e
e
?
HOLD
Flash
BUZ
Minus
D1e
D1b
D1a
D1g
D1f
D1d
D1c
DP2
D2e
D2b
D2a
D2g
D2f
D2d
D2c
DP3
D3e
D3b
D3a
D3g
D3f
D3d
D3c
DP4
D4e
D4b
D4a
D4g
D4f
D4d
D4c
nano
V
DC
AC
F
Diode
A
μ(F)
Ω
kilo
milli
M(Ω)
Hz
°F
°C
5. Result Example "1b 84 70 b1 49 6a 9f 3c 66 aa" == CHECKEN??" 22" "°C"
Typ 11=(1)Multimeter/11Byte 10=(2)Small-Multimeter/10Byte 01=(3)Clamp-Multimeter/10Byte
LED
IO-Symbol ?
High-Voltage Flash (U > xx VAC, xx VDC)
DPx = DecimalPoint(2,3,4)
BUZ = Buzzer (R<50Ω)
0-15 Präambel to Syncronize
Segmentorder Digit
(Dyx D=Digit y=1-4 x=a-g)
aaa
b c
ddd
e f
gggTESTDATA ANENG V05B 18-07-2021
_ = non symbol
*
Notification handle = 0x0009 value: 1b 84 71 55 e8 4f 68 ff 66 a9 # 147.4 kiloOhm
Notification handle = 0x0009 value: 1b 84 71 bd 59 ca 98 fc 66 a9 # 0.012 Ohm, buzzer , LED
Notification handle = 0x0009 value: 1b 84 71 5d a2 6b cf fe 66 ab # _12.8 Ohm, buzzer, LED
Notification handle = 0x0009 value: 1b 84 71 f5 bf 2b dd fa 66 a3 # 2.180 megaOhm
Notification handle = 0x0009 value: 1b 84 71 f5 5f 46 98 fc 44 aa # 2.674, V, Diode,
Notification handle = 0x0009 value: 1b 84 71 5d 52 aa 33 f1 44 aa # V, Diode, buzzer _.OL_
Notification handle = 0x0009 value: 1b 84 71 f5 0f cc 28 fb f6 aa # 221.1 microFarad
Notification handle = 0x0009 value: 1b 84 71 d5 bd 6b df fa 76 ae # 3.131 milliFarad
Notification handle = 0x0009 value: 1b 84 71 95 2d 9b 9c fc 77 aa # 97,42 nanoFarad
Notification handle = 0x0009 value: 1b 84 71 b5 59 2a d9 fa 66 8a # 0.000 Hz
Notification handle = 0x0009 value: 1b 84 71 95 45 3a 79 ff 66 8a # 50.04 Hz
Notification handle = 0x0009 value: 1b 84 71 95 45 3a 39 fb 66 8a # 50.01 Hz
Notification handle = 0x0009 value: 1b 84 71 f1 2f 4e ad fe 6c aa # 233.3 V AC ,Blitz, true rms
Notification handle = 0x0009 value: 1b 84 71 f1 2f 4e cd fa 6c aa # 233.0 V AC ,Blitz, true rms
Notification handle = 0x0009 value: 1b 84 71 15 5c 6a 9f fc 60 aa # 4.022 V DC
Notification handle = 0x0009 value: 1b 84 71 05 5c 6a bf fe 60 aa # -4.023 V DC
Notification handle = 0x0009 value: 1b 84 71 55 38 0e d5 fe 60 aa # 1.358 V DC
Notification handle = 0x0009 value: 1b 84 71 45 38 0e f5 fe 60 aa # -1.359 V DC
Notification handle = 0x0009 value: 1b 84 71 55 a2 61 df fe 66 2a # __28 °C (without zeros!)
Notification handle = 0x0009 value: 1b 84 71 55 a2 61 bf fb 66 2a # __27 °C
Notification handle = 0x0009 value: 1b 84 71 55 a2 61 df f6 66 2a # __26 °C
Notification handle = 0x0009 value: 1b 84 71 55 a2 61 ff f6 66 2a # __25 °C
Notification handle = 0x0009 value: 1b 84 71 55 a2 61 7f ff 66 2a # __24 °C
Notification handle = 0x0009 value: 1b 84 71 55 a2 61 bf fe 66 2a # __23 °C
Notification handle = 0x0009 value: 1b 84 71 55 a2 61 9f fc 66 2a # __22 °C
Notification handle = 0x0009 value: 1b 84 71 55 a2 41 d8 f6 66 ea # __76 °F
Notification handle = 0x0009 value: 1b 84 71 55 a2 41 78 ff 66 ea # __74? °F
Notification handle = 0x0009 value: 1b 84 71 55 a2 41 b8 fe 66 ea # __73 °F
Notification handle = 0x0009 value: 1b 84 71 55 48 2a c9 fe 22 ae # 100.8 mA DC
Notification handle = 0x0009 value: 1b 84 71 55 48 6e cf fa 22 ae # 182.0 mA DC
Notification handle = 0x0009 value: 1b 84 71 55 58 0a d5 fe 22 aa # 1.058 A DC
Notification handle = 0x0009 value: 1b 84 71 55 a8 1b dd fe 6c aa # 11.98 V AC true_rms