Packet Trace: Telemetry Stream

This document shows the telemetry stream from the pump, which provides real-time data about motor state, flow, pressure, and temperature.

Overview

The ALPHA HWR uses Class 10 DataObjects for telemetry. Unlike older pumps that required polling registers (Class 3), this pump streams data automatically as notifications.

1. Enable Telemetry

After authentication, the pump automatically starts sending notifications. If it stops, you can request it or just wait.

Packet Structure

Notifications use OpSpec 0x0E (Notification).

[Start] [Length] [Src] [Dest] [Class] [OpSpec] [Sub-H] [Sub-L] [Obj-H] [Obj-L] [Payload...] [CRC]

2. Motor State (Sub 0x0045, Obj 0x0057)

This object contains electrical and mechanical motor data.

Sample Packet

24 34 20 E7 0A 0E 00 45 00 57 43 66 00 00 3E CC CC CD 42 48 00 00 44 BB 80 00 42 28 00 00 ... XX XX

Breakdown: - 24: Response start - 34: Length (52 bytes) - 20: Source (Pump) - E7: Dest (Client) - 0A: Class 10 - 0E: OpSpec (Notification) - 00 45: Sub ID (Motor) - 00 57: Obj ID (State) - Payload: 44 bytes of data

Payload Decoding

All values are IEEE 754 Big-Endian floats.

Offset	Field	Value (Hex)	Decoded	Unit
0-3	Grid Voltage	`43 66 00 00`	230.0	Volts
4-7	Reserved	`...`	-	-
8-11	Current	`3E CC CC CD`	0.4	Amps
12-15	Reserved	`...`	-	-
16-19	Power	`42 48 00 00`	50.0	Watts
20-23	Speed	`44 BB 80 00`	1500.0	RPM
24-27	Temperature	`42 28 00 00`	42.0	°C

Note: There are gaps (reserved bytes) between some fields. Always verify offsets.

3. Flow & Pressure (Sub 0x0122, Obj 0x005D)

This object contains hydraulic data.

Sample Packet

24 18 20 E7 0A 0E 01 22 00 5D 3F 00 00 00 3F C0 00 00 40 00 00 00 40 40 00 00 XX XX

Breakdown: - 01 22: Sub ID (Hydraulic) - 00 5D: Obj ID (Process Values) - Payload: 16 bytes

Payload Decoding

Offset	Field	Value (Hex)	Decoded	Unit
0-3	Flow Rate	`3F 00 00 00`	0.5	m³/h
4-7	Head Pressure	`3F C0 00 00`	1.5	m
8-11	Inlet Pressure	`40 00 00 00`	2.0	bar
12-15	Outlet Pressure	`40 40 00 00`	3.0	bar

4. Temperature (Sub 0x012C, Obj 0x005D)

This object contains thermal sensor data.

Sample Packet

24 11 20 E7 0A 0E 01 2C 00 5D 42 34 00 00 42 10 00 00 42 1A 00 00 XX XX

Payload Decoding

Offset	Field	Value (Hex)	Decoded	Unit
0-3	Media Temp	`42 34 00 00`	45.0	°C
4-7	PCB Temp	`42 10 00 00`	36.0	°C
8-11	Box Temp	`42 1A 00 00`	38.5	°C

5. Polling Telemetry (Requesting Updates)

If notifications stop, you can poll for updates using an INFO command.

Request

27 0D E7 F8 0A 03 00 45 00 57 00 XX XX

Breakdown: - 0A: Class 10 - 03: OpSpec (INFO/Read) - 00 45: Sub ID (Motor) - 00 57: Obj ID (State) - 00: Extra byte (often required)

Response

A poll may be answered by the unsolicited notification stream (byte 5 = 0x0E) or by a direct read response, whose byte 5 is the payload length rather than a type code. Match the reply by its identifier pair — see Wire Format.

6. Implementation Notes

Passive vs Active: Prefer listening to passive notifications (OpSpec 0x0E) to save battery and bandwidth.
Missing Data: Some fields might be NaN (0x7FC00000) if the sensor is not available.
Frequency: Updates typically arrive at ~10 Hz when the pump is running.
Filtering: Always check Sub ID and Obj ID to know which decoder to use.

if frame.sub_id == 0x0045 and frame.obj_id == 0x0057:
    decode_motor_state(frame.payload)
elif frame.sub_id == 0x0122 and frame.obj_id == 0x005D:
    decode_flow_pressure(frame.payload)