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"""
Module for Serialization and Deserialization of a KNX Disconnect Request information.
Disconnect requests are used to disconnect a tunnel from a KNX/IP device.
"""
from __future__ import annotations
from xknx.exceptions import CouldNotParseKNXIP
from .body import KNXIPBody
from .hpai import HPAI
from .knxip_enum import KNXIPServiceType
class DisconnectRequest(KNXIPBody):
"""Representation of a KNX Disconnect Request."""
SERVICE_TYPE = KNXIPServiceType.DISCONNECT_REQUEST
def __init__(
self,
communication_channel_id: int = 1,
control_endpoint: HPAI | None = None,
) -> None:
"""Initialize DisconnectRequest object."""
self.communication_channel_id = communication_channel_id
self.control_endpoint = control_endpoint or HPAI()
def calculated_length(self) -> int:
"""Get length of KNX/IP body."""
return 2 + HPAI.LENGTH
def from_knx(self, raw: bytes) -> int:
"""Parse/deserialize from KNX/IP raw data."""
if len(raw) < 2:
raise CouldNotParseKNXIP("Disconnect info has wrong length")
self.communication_channel_id = raw[0]
# raw[1] is reserved
return self.control_endpoint.from_knx(raw[2:]) + 2
def to_knx(self) -> bytes:
"""Serialize to KNX/IP raw data."""
return (
bytes((self.communication_channel_id, 0x00)) # 2nd byte is reserved
+ self.control_endpoint.to_knx()
)
def __repr__(self) -> str:
"""Return object as readable string."""
return (
"<DisconnectRequest "
f'communication_channel_id="{self.communication_channel_id}" '
f'control_endpoint="{self.control_endpoint}" />'
)
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