refactor: replace plant_name with per-component type keys in config

PlantFactory.create() no longer takes plant_name; sim vs real is derived
from Heater.type. StirrerFactory is wired from Stirrer.type. HeaterFactory
registry key lowercased to "hendi" to match config. Controller.plant_name
removed from both config templates.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/actor/heaterFactory.py

@@ -4,5 +4,5 @@ from components.factory import ComponentFactory, _lazy
 class HeaterFactory(ComponentFactory):
     _registry = {
         "sim":   _lazy("components.actor.heater_sim", "HeaterSim"),
-        "Hendi": _lazy("components.actor.heater_hendi", "HeaterHendi"),
+        "hendi": _lazy("components.actor.heater_hendi", "HeaterHendi"),
     }

components/plant/plant_factory.py

@@ -5,33 +5,29 @@ from components.plant.pot_real import PotReal
 
 
 class PlantFactory:
-	"""Builds the heater/pot/sensor trio together, as one consistent rig,
-	rather than each picked independently via its own *_name config key -
-	sim and real hardware are never actually mixed and matched in
-	practice, so Controller.plant_name alone now decides all three (see
-	server/brewpi.py).
+	"""Builds the heater/pot/sensor trio together as one consistent rig.
 
-	Delegates the actual construction to HeaterFactory/TempSensorFactory
-	rather than importing HeaterHendi/TempSensor_max31865 directly, so
-	those classes' hardware-only deps (spidev, pyserial) stay lazily
-	imported - only actually needed when plant_name picks the real rig."""
+	Each component's type comes from its own config section (Heater.type,
+	TempSensor.type) rather than a single plant_name key. The heater type
+	determines sim vs real: sim gets Pot (modelled plant) and TempSensorSim;
+	anything else gets PotReal and whatever TempSensor.type names.
+
+	Delegates to HeaterFactory/TempSensorFactory so hardware-only deps
+	(spidev, pyserial) stay lazily imported."""
 
 	@staticmethod
-	def create(plant_name, dt, heater_config, sensor_config=None):
+	def create(dt, heater_config, sensor_config=None):
 		sensor_config = sensor_config or {}
-		if "sim" in plant_name:
-			heater = HeaterFactory.create("sim", heater_config)
-			pot = Pot(dt)
+		heater_type = heater_config.get('type', 'sim')
+		plant_sim = (heater_type == 'sim')
+
+		heater = HeaterFactory.create(heater_type, heater_config)
+		pot = Pot(dt) if plant_sim else PotReal()
+
 		sensor_type = sensor_config.get('type', 'sim')
 		sensor_params = {k: v for k, v in sensor_config.items() if k != 'type'}
 		sensor_params.setdefault('temp_offset', -0.15)
+		if plant_sim:
 			sensor_params.setdefault('sigma', 0.05)
 		sensor = TempSensorFactory.create(sensor_type, **sensor_params)
 		return heater, pot, sensor
-
-		heater = HeaterFactory.create("Hendi", heater_config)
-		pot = PotReal()
-		sensor_params = {k: v for k, v in sensor_config.items() if k != 'type'}
-		sensor_params.setdefault('temp_offset', -0.15)
-		sensor = TempSensorFactory.create("max31865", **sensor_params)
-		return heater, pot, sensor

config-real.json.tpl

@@ -1,7 +1,6 @@
 {
 	"ambient_temperature": 20,
 	"Controller" : {
-	"plant_name": "real",
 	"pid_type": "Smith"
 	},
  	"TempCtrl": {

config-sim.json.tpl

@@ -1,7 +1,6 @@
 {
 	"ambient_temperature": 20,
 	"Controller" : {
-	"plant_name": "sim",
 	"pid_type": "Smith"
 	},
  	"TempCtrl": {
@@ -34,12 +33,10 @@
 		}
 	},
 	"Heater": {
-		"port": "/dev/ttyUSB0",
-		"speed": "115200"
+		"type": "sim"
 	},
 	"Stirrer": {
-		"port": "/dev/ttyACM0",
-		"speed": "115200"
+		"type": "sim"
 	},
 	"TempSensor": {
 		"type": "sim",

server/brewpi.py

@@ -77,20 +77,17 @@ if __name__ == '__main__':
 	DT = args.dt
 	DT_TASK = 1.0 / args.sim_warp_factor
 	theta_amb = config['ambient_temperature']
-	plant_sim = "sim" in config['Controller']['plant_name']
+	plant_sim = config['Heater'].get('type', 'sim') == 'sim'
 
 	# Mash schedule - starts out empty; a client loads one of sude/*.json's
 	# several schedules onto it later (see components/sud.py's Sud).
 	sud = Sud()
 
-	# Heater/Pot/Sensor - built together as one consistent rig by a single
-	# Controller.plant_name, rather than three independently-named
-	# components that in practice are never actually mixed and matched
-	# (see components/plant/plant_factory.py): "sim" gets HeaterSim/Pot
-	# (the modeled plant)/TempSensorSim; anything else gets HeaterHendi/
-	# PotReal (no model - the real kettle does its own physics)/
-	# TempSensor_max31865.
-	heater, pot, sensor = PlantFactory.create(config['Controller']['plant_name'], DT, config['Heater'], config.get('TempSensor', {}))
+	# Heater/Pot/Sensor - built together as one consistent rig; each
+	# component's type comes from its own config section. Heater.type==sim
+	# gets HeaterSim/Pot (the modelled plant)/TempSensorSim; anything else
+	# (e.g. hendi) gets HeaterHendi/PotReal/whatever TempSensor.type names.
+	heater, pot, sensor = PlantFactory.create(DT, config['Heater'], config.get('TempSensor', {}))
 
 	sensor_task = TempSensorTask(sensor, DT_TASK, dispatcher.msgio_get("Sensor"))
 	taskmgr.add(sensor_task)
@@ -123,7 +120,7 @@ if __name__ == '__main__':
 	taskmgr.add(tc_task)
 
 	# Stirrer
-	stirrer = StirrerFactory.create(config['Controller']['stirrer_name'], DT, config['Stirrer'])
+	stirrer = StirrerFactory.create(config['Stirrer']['type'], DT, config['Stirrer'])
 	stirrer_task = StirrerTask(stirrer, DT_TASK, dispatcher.msgio_get("Stirrer"))
 	taskmgr.add(stirrer_task)