components/sensor/tempSensorSim.py

@@ -42,4 +42,5 @@ class TempSensorSim(ATemperatureSensor):
 			innovation = self.stirrer_sigma * np.sqrt(2.0 * alpha) * np.random.normal()
 			self._stirrer_state = (1.0 - alpha) * self._stirrer_state + innovation
 
-		return self.temp_set + self.offset + white + self._stirrer_state
+		self.temp = self.temp_set + self.offset + white + self._stirrer_state
+		return self.temp

components/sensor/tempSensor_max31865.py

@@ -47,7 +47,8 @@ class TempSensor_max31865(ATemperatureSensor):
 
 	def temperature(self):
 		digits = self.read_digits()
-		return self.temp_offset + self.to_temperature(digits)
+		self.temp = self.temp_offset + self.to_temperature(digits)
+		return self.temp
 
 	@staticmethod
 	def to_temperature(digits):

server/brewpi.py

@@ -182,7 +182,7 @@ if __name__ == '__main__':
 	sud_task.set_on_end(lambda: (heater_task.shutdown(), sud_log_task.stop_run()))
 
 	# Assign temp. sensor readings to tc
-	sensor_task.set_on_changed("temp", ChangedFloat(tc.set_theta_ist, prec=2).set)
+	sensor.set_on_changed("temp", ChangedFloat(tc.set_theta_ist, prec=2).set)
 
 	heater.set_on_changed("power_set", tc.set_model_power)
 

tasks/tempsensor.py

@@ -12,8 +12,12 @@ class TempSensorTask(ATask):
 		self.msg_handler = msg_handler
 		msg_handler.set_recv_handler(self.recv)
 		self.sensor = sensor_device
-		self.temp = self.sensor.temperature()
-		self.set_on_changed("temp", ChangedFloat(self.on_temp_changed, prec=1).set)
+		# Prime before registering - temperature() sets self.sensor.temp,
+		# which would otherwise fire on_temp_changed() (and its
+		# asyncio.create_task()) before the event loop is running, since
+		# all tasks are built synchronously at module level in brewpi.py.
+		self.sensor.temperature()
+		self.sensor.set_on_changed("temp", ChangedFloat(self.on_temp_changed, prec=1).set)
 
 	def on_temp_changed(self, value):
 		asyncio.create_task(self.send({'Temp': value}))
@@ -26,5 +30,5 @@ class TempSensorTask(ATask):
 
 	async def on_process(self):
 		while True:
-			self.temp = self.sensor.temperature()
+			self.sensor.temperature()
 			await asyncio.sleep(self.interval)