"""
Constants definition for MIL-STD-1553 over UDP protocol.
"""
from enum import IntEnum

class Marker(IntEnum):
    START_1553 = 0x1553
    END_1553 = 0x5315
    CTRL_BEGIN = 0x3C3C
    CTRL_END = 0x3E3E

class OType(IntEnum):
    BC = 0x4342  # 'CB' little endian ? -> BC
    RT = 0x5452  # 'TR' -> RT

class Direction(IntEnum):
    RECEIVE = 0
    TRANSMIT = 1

class ErrorCode(IntEnum):
    OK = 0
    UNSUPPORTED_VERSION = 1
    INVALID_SOURCE = 2
    INVALID_LEN = 3
    MISSED_MSG_MARKER = 4
    MSG_ERR = 1
    INCOMPLETE = 2