SpringCore Direct PROTOCOL class

The PROTOCOL class controls the protocol and the session between the device and the host.

CLA value

The PROTOCOL class uses CLA=00.

The commands and the responses use the same format.

Field	Length	Description / remark
Header	4 or 6 bytes	CLA = `00`, LEN = length of Data
INS / STA	1 byte	Command: opcode of the INStruction Response: STAtus
Data	0 or more bytes	Command data Response data

Note

The length of the Command is not transmitted, as it can be deduced from the CCID header.

Field	Length	Description / remark
STA	1 byte	STAtus
Data	0 or more bytes	Response data

Note

The length of the Response is not transmitted, as it can be deduced from the CCID header.

The CLA byte is not transmitted.

The INS opcodes are defined below:

INS	Name	Description
`00`	PING	Ping the device
`01`	PING_EVENT	Ping the device and generate a (dummy) event
`06`	GET_DESCRIPTOR	RFU
`07`	STAY_QUIET	Stop replying to broadcasts (UDP transport only)
`08`	CLEAR_QUIET	Start replying to broadcasts (UDP transport only)
`09`	SET_CONFIGURATION	RFU
`0A`	AUTHENTICATE	Initiate a mutual authentication between the host and the device
`0C`	CHANGE_KEY	Change one of the authentication keys
`11`	SET_SERIAL_PARAMETERS	Change the communication parameters over the Serial host interface
`F0`	TIME_EXTENSION_ACK	Acknowledge a TIME_EXTENSION_REQUEST
`FC`	CANCEL	Ask the device to cancel the current instruction
`FE`	HOST_EVENT_POLL	Ask the device to send its pending event message
`FF`	FOLLOWING	The exchange is continuing after a FOLLOWING status