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PROTOCOL_NEXT.md

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Protocol (NEXT)

Another heat pump protocol observed in #45 with an Austria Email BWWP 200 WT SMART COZY and Atlantic Explorer v3 heat pump. Further information in #52.

For distinction with the original (LEGACY) implementation we refer to this Protocol as Protocol NEXT.

Message Format

ID LEN  PAYLOAD                                                                                                                    CHECKSUM
C1  23  2E00230018001800150000000000000000000000008200000000454528CB000E0111                                                             44
C2  22  32120000001000062C01D0020000003A211E0C0C000000004E450000060422013E                                                               FA
43  2D  0000071D0000000000000000071D0000EEB2390000000000000000000B4C105AFB27FB250B1B000000000000                                         57
4A  41  0D0F2D00270015001800130000000000000000020000000000671D00000200000045110000581100007A2200000800000002000000211E000C00320000000008 6B

Identifier

  • 1 byte message identifier
  • 1 byte payload length (length field and payload size)
  • 1-254 bytes payload
  • 1 bytes checksum

Checksum

Is a regular XOR checksum on length field plus payload:

static uint8_t generateNextChecksum(const uint8_t* buffer, uint8_t length){
    int desiredChecksum = 0;
    // checksum is calculated on length field and payload
    for (size_t i = 0; i < length; i++)
    {
        // XOR the current byte with the accumulated checksum
        desiredChecksum ^= buffer[i];
    }
    return desiredChecksum;
}

Messages

HMI Message (194)

Byte Number Example (dec) Purpose/Function Other Information
0 34 Length Field
1 50 Water Target Temperature
2 18 Operation Mode, Operation Type See table below
3 0 ?
4 0 Anti-Legionella Mode / AirDuct Mode See table below
5 0 Emergency-Mode 0 == inactive, 1 == active
6 0 InstallationConfig WP-Only == 0, WP+ExtBoiler-Prio-WP == 1, Wp+ExtBoiler-Opt-WP == 17, Wp+ExtBoiler-Opt-ExtBoiler == 33 , Wp+ExtBoiler-Prio-ExtBoiler == 49 , WP + Solar == 50
7 0 ExhaustFanConfig Only AirDuct EXT/INT 0 == off, 1 == slow, 2 == fast
8 6 Heating-Element 0 == Automatic, 4 == locked, 6 == PV System "Smart-Grid" Yes
9 44 Timer Mode: Window 1 Start Byte 1/2 --> See table below
10 1 Timer Mode: Window 1 Start Byte 2/2 --> 44 + 256 = 300 / 60 = 5 --> 05:00
11 240 Timer Mode: Window 1 Length Byte 1/2 --> See table below
12 0 Timer Mode: Window 1 Length Byte 2/2 --> 240 + 0 = 240 / 60 = 4 --> 4h
13 14 Absence Days If the start is in the future, the value will only become visible then
14 7 Boost Days 7 Days max
15 0 Command 0x02 -> Reset statistics
16 59 Time Seconds
17 33 Date Day, Month
18 30 Date Year, Month
19 12 Time Minutes
20 12 Time Hours
21 8 TestMode Status 1 == Heating-Element, 2 == Compressor, 8 == Fan, 32 == Defrost-Valve
22 50 TestMode Fanspeed 0 == standstill, 50 == slow, 100 == fast
23 0 ?
24 0 ?
25 78 ?
26 69 ?
27 0 Error Number Requested
28 0 Error Request Id
29 60 Timer Mode: Window 2 Start Byte 1/2 --> See table below
30 0 Timer Mode: Window 2 Start Byte 2/2 --> 60 + 0 = 60 / 60 = 1 == 01:00
31 240 Timer Mode: Window 2 Length Byte 1/2 --> See table below
32 0 Timer Mode: Window 2 Length Byte 2/2 --> 240 + 0 = 240 / 60 = 4 == 4h
33 62 ?
Byte No. 2: Operation Mode
Bit Number Purpose/Function Other Information
0 - 3 Operation Mode Interpreted as integer, 0 == Auto, 1 == ECO ON, 2 == ECO OFF, 5 == Absence, 9 == BOOST
4 - 7 Operation Type Interpreted as integer, 1 == Timer, 4 == Continuous
Byte No. 4: Anti-Legionella Mode / AirDuct Mode
Bit Number Purpose/Function Other Information
0 - 3 Anti-Legionella Mode Interpreted as integer, 0 == Off, 1 == 1perMonth, 2 == 2perMonth, 3 == 3perMonth, 4 == 4/perMonth
4 - 7 AirDuct Mode Interpreted as integer, 0 == AirDuct INT/INT, 1 == AirDuct EXT/INT, 2 == AirDuct EXT/EXT
Byte No. 9-12 + 29-32: Time Window:

Setting limitations:

Information
One Time Window Minimum duration of 8 hours, maximum duration of 12 hours
Two Time Windows Each at least 4 hours, combined maximum of 20 hours
Disable the second Time Window Set the end time to less than 4 hours

Main Message (193)

Byte Number Example (dec) Purpose/Function Other Information
0 35 Length Field
1 46 Hot Water Temp
2 0 ?
3 35 Compressor Outlet Temp
4 0 ?
5 24 Upper Evaporator Temp
6 0 ?
7 24 Lower Evaporator Temp
8 0 ?
9 21 Input Air Temp
10 0 ?
11 0 ?
12 0 ?
13 0 ?
14 0 ?
15 0 ?
16 0 ?
17 0 Picture Bitmask See table below
18 50 Fan-Speed 50 == low, 100 == high
19 0 ?
20 0 ?
21 0 ?
22 20 State: PV and Solar Input 20 == PV Enabled and Active, ?? == Solar Input Triggered
23 0 ?
24 0 ?
25 0 ?
26 0 ?
27 69 ?
28 69 ?
29 40 ?
30 203 ?
31 0 ?
32 14 ?
33 1 ?
34 17 ?
Byte No 17: Picture Bitmask

Findings...

0dec   | 0000 0000: Nothing Shown on HMI
24dec  | 0001 1000: Fan is turned on (observed via testmode)
? 8dec   | 0000 1001: Heating Element
26dec  | 0001 1010: Heatpump
27dec  | 0001 1011: Heatpump + Heating Element
? 14dec  | 0000 1110: Heatpump + Boiler Backup
? 15dec  | 0000 1111: Heatpump + Heating Element + Boiler Backup
32dec  | 0010 0000: Defrost
58dec  | 0011 1010: Defrost + Heatpump
? 40dec  | 0010 1000: Defrost + Fan
? 41dec  | 0010 1001: Defrost + Fan + Heating Element
? 64dec  | 0100 0000: Unknown, Observed while triggering Error 7
? 192dec | 1100 0000: Unknown, Observed while triggering Error 7
Bit Number Purpose/Function Other Information
0 Heating Element On/Off
1 Heatpump On/Off
2 ? Boiler Backup On/Off
3 Fan On/Off.
4 ? Aktiv
5 Defrost On/Off
6 ?
7 ?

Help Required:

  • TODO: Error Codes

Energy Message (67)

Byte Number Example (dec) Purpose/Function Other Information
0 45 Length Field
1 0 Total Operation Hours (Heat-Element) Resetable(?)
2 0 Total Operation Hours (Heat-Element) Resetable(?)
3 7 Total Operation Hours (Heatpump) Resetable(?) Byte 1/2
4 29 Total Operation Hours (Heatpump) Resetable(?) Byte 2/2 --> (29x256) + 7 = 7431h
5 0 ? Unknown Downcounting Value C during warm-up
6 0 ? Unknown Downcounting Value C during warm-up
7 0 ? Unknown Downcounting Value C during warm-up
8 0 ? Unknown Downcounting Value C during warm-up
9 0 Total Operation Hours (Heat-Element) Permanent(?)
10 0 Total Operation Hours (Heat-Element) Permanent(?)
11 0 Total Operation Hours (Heat-Element) Permanent(?)
12 0 Total Operation Hours (Heat-Element) Permanent(?)
13 7 Total Operation Hours (Heatpump) Permanent(?) The same as Byte 3+4 or for a reset?
14 29 Total Operation Hours (Heatpump) Permanent(?) The same as Byte 3+4 or for a reset?
15 0 Total Operation Hours (Heatpump) Permanent(?)
16 0 Total Operation Hours (Heatpump) Permanent(?)
17 238 Total Energy (Wh)
18 178 Total Energy (Wh)
19 57 Total Energy (Wh)
20 0 Total Energy (Wh)
21 251 Power Consumption Total (Heatpump + Heat-Element) Byte 1/2
22 1 Power Consumption Total (Heatpump + Heat-Element) Byte 2/2 --> (1x256) + 151 = 507W ????
23 0 ?
24 0 ?
25 0 ?
26 0 ?
27 0 ?
28 0 ?
29 11 Water Temp Min
30 76 Water Temp Max
31 16 CompressorOutlet Temp Min
32 90 CompressorOutlet Temp Max
33 251 EvaporatorLower Air Temp Min
34 39 EvaporatorLower Air Temp Max
35 251 Evaporator Air Temp Min
36 37 Evaporator Air Temp Max
37 11 Air Temp Min
38 27 Air Temp Max
39 0 ?
40 0 ?
41 0 ?
42 0 ?
43 0 ?
44 0 ?

Error Message (74)

Byte Number Sample (dec) Purpose/Function Other Information
0 65 Length Field
1 13 RequestId
2 15 ErrorCode
3 ?
4 ?
5 ?
6 ?
7 ?
8 ?
9 ?
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 ?

Not yet assignable

  • TODO: Number of restarts
  • TODO: Operating time (ready)