@metekcity/esn00-packet

ETEKCITY ESN00 Packets

Parses & serializes packets to and from the format that ESN00 sends and understands.

Implemented Packet Types:

• SET_UNIT (0xc0) - c5736b4, - #2
• SET_TARE (0xc1) - #2
• SET_AUTO_OFF (0xc4) - 805a076, #2
• MEASUREMENT (0xd0) - bfcf5df
• UNIT_STATE (0xd1) - #5
• TARE_STATE (0xd3) - bfcf5df, #3
• AUTO_OFF_STATE (0xd5) - #2
• ERROR_STATE (0xe0) - bfcf5df, #3
• ITEM_STATE (0xe4) - bfcf5df, #3

Unresearched packets

• SET_NUTRITION (0xc2)
• ?PING (0xc3)
• ??? (0xd2)
• ?PONG (0xd4)
• ??? (0xe1)
• ??? (0xe2)
• ??? (0xe3)

Protocol

All packets have this structure

Data Packet: Weight Measurement (0xE0)

Device will be constantly spamming packet with this data

Field	Description	Note
Sign	0x00 (positive) / 0x01 (negative)
Weight	16 bit int (big-endian)	In grams value is multiplied by 10 (not sure about other units)
Unit	0x00(g),0x02(ml),0x04(ml milk),0x03(floz),0x05(floz milk),0x06(oz),0x01(lboz)	Does not seem like bitmask just enum
Stable	0x00 (measuring) / 0x01 (settled)	0x00 means weight is not yet settled

Packet Details

Status	Type	Source(s)	Payload	Generic?	Notes
✅	SET_UNIT	COMMAND	unit	uint8Parselizer
✅	SET_TARE	COMMAND	shouldReset	booleanParselizer
✅	SET_AUTO_OFF	COMMAND	timeout	uint8Parselizer
✅	MEASUREMENT	NOTIFY	sign, value, unit	uint8Parselizer
✅	TARE_STATE	NOTIFY	isOn	booleanParselizer (inverted)
✅	AUTO_OFF_STATE	NOTIFY	timeout	uint16Parselizer	the value is the same as for command with the exception of extra 0 byte
✅	ERROR_STATE	NOTIFY	isOn	booleanParselizer (inverted)
✅	ITEM_STATE	NOTIFY	isOn	booleanParselizer (inverted)
✅	UNIT_STATE	NOTIFY	unit	uint8Parselizer
🛑	SET_NUTRITION	COMMAND	(complex object)		need more samples to understad how data is encoded

Legend

Marker	Category	Description
⌛	Status	Waiting (todo)
🛑	Status	Blocked
✅	Status	Done
COMMAND	Source(s)	Command send to the Device
NOTIFY	Source(s)	Notification received from the Device

Changelog

2.0.0 (2022-02-16)

Bug Fixes

• deps: bump @hertzg/bx from 1.0.0 to 1.1.1 (#113) (bf2fa6e)