Datasheet

SDEP (Simple Data Exchange Protocol)

The Simple Data Exchange Protocol (SDEP) can be used to send and receive binary

messages between two connected devices using any binary serial bus (USB HID, USB Bulk,

SPI, I2C, Wireless, etc.), exchanging data using one of four distinct message types

(Command, Response, Alert and Error messages).

The protocol is designed to be flexible and extensible, with the only requirement being that

individual messages are 20 bytes or smaller, and that the first byte of every message is a

one byte (U8) identifier that indicates the message type, which defines the format for the

remainder of the payload.

Endianness

All values larger than 8-bits are encoded in little endian format. Any deviation from this rule

should be clearly documented.

Message Type Indicator

The first byte of every message is an 8-bit identifier called the Message Type Indicator. This

value indicates the type of message being sent, and allows us to determine the format for

the remainder of the message.

SDEP Data Transactions

Message Type

Command

Response

Alert

Error

ID (U8)

0x10

0x20

0x40

0x80