L2CAP_REJ_NOT_UNDERSTOOD
case L2CAP_REJ_NOT_UNDERSTOOD:
l2cap_send_command_rej(link, cmd.ident, L2CAP_REJ_NOT_UNDERSTOOD);
case L2CAP_REJ_NOT_UNDERSTOOD: /* data length = 0 octets */
l2cap_send_command_rej(link, cmd.ident, L2CAP_REJ_NOT_UNDERSTOOD);