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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 heat pump.

Message Format

ID LEN  PAYLOAD                                                                               CHECKSUM
C1  23  2E00230018001800150000000000000000000000008200000000454528CB000E0111                        44
C2  22  32120000001000062C01D0020000003A211E0C0C000000004E450000060422013E                          FA
43  2D  0000071D0000000000000000071D0000EEB2390000000000000000000B4C105AFB27FB250B1B000000000000    57

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 ?
5 0 ?
6 16 ?
7 0 ?
8 6 ?
9 44 ?
10 1 ?
11 208 ?
12 2 ?
13 0 ?
14 0 ?
15 0 ?
16 59 Time Seconds
17 33 Date Day, Month
18 30 Date Year, Month
19 12 Time Minutes
20 12 Time Hours
21 0 ?
22 0 ?
23 0 ?
24 0 ?
25 78 ?
26 69 ?
27 0 Error Number Requested
28 0 Error Request Id
29 6 ?
30 4 ?
31 34 ?
32 1 ?
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, 9 == BOOST
4 - 7 Operation Type Interpreted as integer, 1 == Timer, 4 == Continious

Help Required:

  • TODO: OperationMode: Boost, Eco On, Eco Off, Auto, Absence
  • TODO: TimerWindow A/B
  • TODO: Anti-Legionalla Setting
  • TODO: AirDuct Config: INT/INT, EXT/INT, EXT/EXT
  • TODO: Installation Config: WP-Only, WP+ExtBoiler-Prio-WP,...
  • TODO: Exhaust Fan Config: (Only in EXT/INT): STOP, LOW-SPEED, HIGH-SPEED
  • TODO: Heating Element Enabled On/Off
  • TODO: PV Mode allowed On/Off

Main Message (193)

Byte Number Example (dec) Purpose/Function Other Information
0 35 Length Field
1 46 ?
2 0 ?
3 35 ?
4 0 ?
5 24 ?
6 0 ?
7 24 ?
8 0 ?
9 21 ?
10 0 ?
11 0 ?
12 0 ?
13 0 ?
14 0 ?
15 0 ?
16 0 ?
17 0 ?
18 0 ?
19 0 ?
20 0 ?
21 0 ?
22 130 ?
23 0 ?
24 0 ?
25 0 ?
26 0 ?
27 69 ?
28 69 ?
29 40 ?
30 203 ?
31 0 ?
32 14 ?
33 1 ?
34 17 ?

Help Required:

To identify this attributes within the message, try to locate the information within the HMI controller, and provide a photo of the HMI controller together with a dump of the main message. We should find the values shown in the HMI controller within the message. For determining the values from super secret menu, you change a setting in the super secret menu of the hmi controller and watch the change of main message.

  • TODO: Hot Water Temp
  • TODO: Input Air Temp
  • TODO: Lower Evaporator Temp
  • TODO: Upper Evaporator Temp
  • TODO: PWM Level Settings (Super Secret Menu)
  • TODO: Status Bitmask (Fan On/Off, Defrost On/Off, PV On/Off, Solar On/Off, HeatElement On/Off, HeatPump On/Off, Boiler Backup On/Off)
  • TODO: Current Fan PWM Level
  • TODO: Min T Target (Super Secret Menu)
  • TODO: Anti-Legionella T Target (Super Secret Menu)
  • TODO: Error Codes
  • TODO: Wattage Heat Element (Super Secret Menu)
  • TODO: Boiler Capacity (Super Secret Menu)
  • TODO: Brand (Super Secret Menu)
  • TODO: Setting Bitflags (Super Secret Menu)

Energy Message (67)

Byte Number Example (dec) Purpose/Function Other Information
0 45 Length Field
1 0 ?
2 0 ?
3 7 ?
4 29 ?
5 0 ?
6 0 ?
7 0 ?
8 0 ?
9 0 ?
10 0 ?
11 0 ?
12 0 ?
13 7 ?
14 29 ?
15 0 ?
16 0 ?
17 238 ?
18 178 ?
19 57 ?
20 0 ?
21 0 ?
22 0 ?
23 0 ?
24 0 ?
25 0 ?
26 0 ?
27 0 ?
28 0 ?
29 11 ?
30 76 ?
31 16 ?
32 90 ?
33 251 ?
34 39 ?
35 251 ?
36 37 ?
37 11 ?
38 27 ?
39 0 ?
40 0 ?
41 0 ?
42 0 ?
43 0 ?
44 0 ?

Help Required:

To identify this attributes within the message, try to locate the information within the HMI controller, and provide a photo of the HMI controller together with a dump of the energy message. We should find the values shown in the HMI controller within the message.

  • TODO: Power Consumption Heatpump
  • TODO: Power Consumption Heating Element
  • TODO: Power Consumption Total (Both)
  • TODO: Total Water Production (l)
  • TODO: Total Operation Hours (Heatpump)
  • TODO: Total Operation Hours (Heating Element)
  • TODO: Total Operation Hours (Both)
  • TODO: Total Energy Counter (Wh)

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 ?