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"""
Module for Serialization and Deserialization of a KNX Connectionstate Response information.
Connectionstate requests are used to determine if a tunnel connection is still active and valid.
With a connectionstate response the receiving party acknowledges the valid processing of the request.
"""
from __future__ import annotations
from xknx.exceptions import CouldNotParseKNXIP
from .body import KNXIPBodyResponse
from .error_code import ErrorCode
from .knxip_enum import KNXIPServiceType
class ConnectionStateResponse(KNXIPBodyResponse):
"""Representation of a KNX Connection State Response."""
SERVICE_TYPE = KNXIPServiceType.CONNECTIONSTATE_RESPONSE
LENGTH = 2
def __init__(
self,
communication_channel_id: int = 1,
status_code: ErrorCode = ErrorCode.E_NO_ERROR,
) -> None:
"""Initialize ConnectionStateResponse object."""
self.communication_channel_id = communication_channel_id
self.status_code = status_code
def calculated_length(self) -> int:
"""Get length of KNX/IP body."""
return ConnectionStateResponse.LENGTH
def from_knx(self, raw: bytes) -> int:
"""Parse/deserialize from KNX/IP raw data."""
if len(raw) < ConnectionStateResponse.LENGTH:
raise CouldNotParseKNXIP("ConnectionStateResponse info has wrong length")
self.communication_channel_id = raw[0]
self.status_code = ErrorCode(raw[1])
return ConnectionStateResponse.LENGTH
def to_knx(self) -> bytes:
"""Serialize to KNX/IP raw data."""
return bytes((self.communication_channel_id, self.status_code.value))
def __repr__(self) -> str:
"""Return object as readable string."""
return (
"<ConnectionStateResponse "
f'communication_channel_id="{self.communication_channel_id}" '
f'status_code="{self.status_code}" />'
)
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