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"""
Message representations received from the panel through the `AlarmDecoder`_ (AD2)
devices.
:py:class:`ExpanderMessage`: Messages received from Relay or Zone expander modules.
.. _AlarmDecoder: http://www.alarmdecoder.com
.. moduleauthor:: Scott Petersen <scott@nutech.com>
"""
from . import BaseMessage
from ..util import InvalidMessageError
class ExpanderMessage(BaseMessage):
"""
Represents a message from a zone or relay expansion module.
"""
ZONE = 0
"""Flag indicating that the expander message relates to a Zone Expander."""
RELAY = 1
"""Flag indicating that the expander message relates to a Relay Expander."""
type = None
"""Expander message type: ExpanderMessage.ZONE or ExpanderMessage.RELAY"""
address = -1
"""Address of expander"""
channel = -1
"""Channel on the expander"""
value = -1
"""Value associated with the message"""
def __init__(self, data=None):
"""
Constructor
:param data: message data to parse
:type data: string
"""
BaseMessage.__init__(self, data)
if data is not None:
self._parse_message(data)
def _parse_message(self, data):
"""
Parse the raw message from the device.
:param data: message data
:type data: string
:raises: :py:class:`~alarmdecoder.util.InvalidMessageError`
"""
try:
header, values = data.split(':')
address, channel, value = values.split(',')
self.address = int(address)
self.channel = int(channel)
self.value = int(value)
except ValueError:
raise InvalidMessageError('Received invalid message: {0}'.format(data))
if header == '!EXP':
self.type = ExpanderMessage.ZONE
elif header == '!REL':
self.type = ExpanderMessage.RELAY
else:
raise InvalidMessageError('Unknown expander message header: {0}'.format(data))
def dict(self, **kwargs):
"""
Dictionary representation.
"""
return dict(
time = self.timestamp,
address = self.address,
channel = self.channel,
value = self.value,
**kwargs
)
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