data_packets.md

Packet Format

All packets are recieved as raw ethernet frames with a protocol set as type 0x88b5 which wireshark identifies as 'Local Experimental Ethertype 1'

Following the ethernet header, various types of data packets can be seen from coming from the device.

Header

All packets start with a 30 byte long header formatted as below

Start Address	Size (Bytes)	Description	Contents
0x00	4	Packet Header?	CB DA E9 F8
0x04	16	Unknown (Padding?)	0x00
0x14	1	Unknown	0x01
0x15	3	Unknown (Padding)	0x00
0x18	1	Message Length	Various (See Below)
0x19	1	Device Type ?	Always 0x53
0x1A	2	Message Type 1 ?
0x1B	2	Message Type 2 ?

Various Types of packets have been observed so far.

Packet Types

Packet Len	Data Length (Bytes)	Contents	Transmit Rate (Seconds)	Notes
0x1F	55	Eddi Data (Packet Type 1)	24
0x20	56	Eddi Data (Packet Type 2)	12
0x2B	67	Eddi Data (Packet Type 3)	12	data not consistant
0x2C	68	??	12
0x2D	69	??	12
0x22	58	CT Readings?	2
0x27	63	Unknown	4
0x36	78	Unknown	2
0x37	79	Unknown	tbc
0x38	80	Unknown	tbc
0x39	81	Unknown	tbc
0x3a	82	Unknown	tbc

The following Packets have been decoded (or partially decoded) so far

0x1F - Eddi Data (Packet Type 1)

Transmitted Approx Every 12 seconds

Start Address	Size (Bytes)	Data Type	Description	Post Processing
0x1E	4	int32	Serial Number	N/A
0x22	2	int16	Grid Frequency	Divide by 100
0x2C	2	int16	Diverted kWh	/ 100
0x32	2	int16	Voltage	Divide by 10

0x20 - Eddi Data (Packet Type 2)

Transmitted Approx Every 24 seconds

Start Address	Size (Bytes)	Data Type	Description	Post Processing
0x1E	4	int32	Serial Number	N/A
0x22	2	int16	Grid Frequency	Divide by 100
0x2C	2	int16	Diverted kWh	/ 100
0x24	2	bool	Status Bit?
0x26	2	int16	Max Heater Power (*1)
0x34	2	int16	Divert Power	/ 100
0x36	2	int16	Divert Current?	/ 100
0x2E.0	1	bool	Boosting	N/A
0x2F.7	1	bool	Heater 1 Active	N/A
0x2F.6	1	bool	Heater 2 Active	N/A
0x2F.5	1	bool	unknown	N/A
0x2F.4	1	bool	unknown	N/A
0x2F.3	1	bool	unknown	N/A
0x2F.2	1	bool	unknown	N/A
0x2F.1	1	bool	unknown	N/A
0x2F.0	1	bool	unknown	N/A
0x25.7	1	bool	Stopped Mode	N/A

1. Appears to be the maximum heater power that is connected to the active channel. For example, if you had a 3kW heater then this would read 3000. Sits at maximum rated power (3600) when nothing is connected or channel is off.

0x2B - Eddi Data (Packet Type 3)

Transmitted approx ever 12 seconds. Occasionally sends odd vales for generation & grid power

Start Address	Size (Bytes)	Data Type	Description	Post Processing
0x1E	4	int32	Serial Number	N/A
0x22	2	int16	Frequency	Divide by 100
0x2C	2	int16	Diverted kwH	Divide by 100
0x3C	2	int16	Generation Power
0x34	2	int16	Grid Power

0x22 - CT Readings?

Transmitted Approx ever 2 seconds

Start Address	Size (Bytes)	Data Type	Description	Post Processing
0x1E	2	int16	Grid Power	N/A
0x22	2	int16	Generation Power	N/A
0x32	2	int16	Diverting Power	N/A
0x2E	4	int32	Serial Number	N/A

0x27 - Unknown

Transmitted approx every 4 seconds

Start Address	Size (Bytes)	Data Type	Description	Post Processing
0x1E	4	int32	Serial Number	N/A
0x22	2	int16	Grid Frequency	Divide by 100
0x2C	2	int16	Diverted kWh	/ 100
0x36	2	int16	Firmware Version (But appears to occasionally go blank)
0x38	2	int16	Firmware Version2(But appears to occasionally go blank)
0x3A	2	int16	Unknown
0x3D	2	int16	Unknown. Seems to track diverter power but not exactly

0x36 - Unknown

Transmitted approx every 2 seconds Occassionally drops all readings to zero.

Start Address	Size (Bytes)	Data Type	Description	Post Processing
0x4A	4	int32	Serial Number	N/A
0x3A	2	int16	Frequency (Seems to update faster than 0x1F)
0x3C	2	int16	Possibly Heatsink Temperature?
0x38	2	int16	Voltage (Seems to update faster than 0x1F)

0x37 - Unknown

Start Address	Size (Bytes)	Data Type	Description	Post Processing
0x1E	4	int32	Serial Number	N/A