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from .._node import MqttNode
from .._module import MqttModule
from .._payload import MqttPayload
from typing import Optional
from ...temphum import BaseSensor
two_digits_precision = lambda x: round(x, 2)
MODULE_NAME = 'MqttTempHumModule'
DATA_TOPIC = 'temphum/data'
class MqttTemphumLegacyDataPayload(MqttPayload):
FORMAT = '=dd'
UNPACKER = {
'temp': two_digits_precision,
'rh': two_digits_precision
}
temp: float
rh: float
class MqttTemphumDataPayload(MqttTemphumLegacyDataPayload):
FORMAT = '=ddb'
error: int
class MqttTempHumModule(MqttModule):
_legacy_payload: bool
def __init__(self,
sensor: Optional[BaseSensor] = None,
legacy_payload=False,
write_to_database=False,
*args, **kwargs):
if sensor is not None:
kwargs['tick_interval'] = 10
super().__init__(*args, **kwargs)
self._sensor = sensor
self._legacy_payload = legacy_payload
def on_connect(self, mqtt: MqttNode):
super().on_connect(mqtt)
mqtt.subscribe_module(DATA_TOPIC, self)
def tick(self):
if not self._sensor:
return
error = 0
temp = 0
rh = 0
try:
temp = self._sensor.temperature()
rh = self._sensor.humidity()
except:
error = 1
pld = self._get_data_payload_cls()(temp=temp, rh=rh, error=error)
self._mqtt_node_ref.publish(DATA_TOPIC, pld.pack())
def handle_payload(self,
mqtt: MqttNode,
topic: str,
payload: bytes) -> Optional[MqttPayload]:
if topic == DATA_TOPIC:
message = self._get_data_payload_cls().unpack(payload)
self._logger.debug(message)
return message
def _get_data_payload_cls(self):
return MqttTemphumLegacyDataPayload if self._legacy_payload else MqttTemphumDataPayload
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