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  4. Commands
  5. Echo

    ECHO

    Echo data back from the device.

    Description

    Return the byte sequence present within the data field, without any modification. Can be sent over an encrypted Session or as a bare command.

    Shell Example

    Plain echo:

    yubihsm> plain echo 0x3c 10
Response (10 bytes):
3c3c3c3c3c3c3c3c 3c3c

    Echo over session 0:

    yubihsm> echo 0 0x3c 10
Response (10 bytes):
3c3c3c3c3c3c3c3c 3c3c

    Protocol Details

    Command

    Tc = 0x01

    Lc = LE

    Vc = E

    E: Data to echo (1-2021 bytes)

    Response

    Tr = 0x81

    Lr = LE

    Vr = E

    E: Data to echo (1-2021 bytes)