Remove the ad-hoc cooling override now that COOL handles it natively

TempControllerBase.cooling/set_cooling() forced y=0 in advance of a
Sud ramp-down step; redundant now that the FSM's own COOL state
detects and handles a negative diff itself. Removed from the
controller, SudTask's anticipatory detection (and the Step message's
now-unused "Cooling" field), and demo_sud.py's mirror of it.

gui: the "Cool down" status-bar indicator now reflects the
controller's actual State ("States.COOL") via the TempCtrl channel,
rather than Sud's removed anticipatory flag - renamed
sud_cooling/set_sud_cooling to tc_cooling/set_tc_cooling to match.

client/brewpi_gui.py

@@ -308,10 +308,11 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 		self.statusBar().addPermanentWidget(self.status_label_env)
 		self.update_status_env_label()
 
-		# Blinking indicator for a Sud ramp step that's cooling down
-		# (target below the current temperature - the heater is forced off
-		# server-side and we just wait for ambient loss to catch up).
-		self.sud_cooling = False
+		# Blinking indicator for the temperature controller's own COOL
+		# state (target below the current temperature - the heater is
+		# forced off server-side and we just wait for ambient loss to
+		# catch up).
+		self.tc_cooling = False
 		self.status_label_cooling = QtWidgets.QLabel("Cool down")
 		self.status_label_cooling.setStyleSheet("color: blue; font-weight: bold;")
 		self.status_label_cooling.setVisible(False)
@@ -496,7 +497,7 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 			self.sud_step_type = None
 			self.sud_hold_remaining = 0.0
 			self.forecast_history = []
-			self.set_sud_cooling(False)
+			self.set_tc_cooling(False)
 			self.update_sud_actions()
 			self.update_status_env_label()
 			self.setWindowTitle("BrewPi")
@@ -551,10 +552,10 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 			title += " - {}".format(description)
 		return title
 
-	def set_sud_cooling(self, cooling):
-		if cooling == self.sud_cooling:
+	def set_tc_cooling(self, cooling):
+		if cooling == self.tc_cooling:
 			return
-		self.sud_cooling = cooling
+		self.tc_cooling = cooling
 		if cooling:
 			self.status_label_cooling.setVisible(True)
 			self.cooling_blink_timer.start(500)
@@ -651,6 +652,7 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 		for key in msg:
 			if 'State' in key:
 				self.label_state.setText(msg['State'])
+				self.set_tc_cooling(msg['State'] == 'States.COOL')
 			elif "Soll" in key:
 				submsg = msg['Soll']
 				if 'Temp' in submsg:
@@ -800,7 +802,6 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 				self.sud_step_index = step.get('Index')
 				self.sud_step_descr = step.get('Descr')
 				self.sud_step_type = step.get('Type')
-				self.set_sud_cooling(step.get('Cooling', False))
 				self.update_status_step_label()
 			elif "HoldRemaining" in key:
 				self.sud_hold_remaining = msg['HoldRemaining']

components/pid/temp_controller_base.py

@@ -45,14 +45,6 @@ class TempControllerBase(APid):
 		self.pid_rate.set_params(params['Heat'])
 		self.pid_cool.set_params(params['Cool'])
 		self.is_startup = True
-		# Explicit override for a ramp step whose target is below the
-		# current temperature: forces y to 0 immediately rather than
-		# waiting for the FSM's own (slower, hysteresis-based) COOL
-		# transition, as soon as the caller (SudTask) knows the step needs
-		# to passively cool down. Mostly superseded by the COOL state
-		# below for a heat-only actuator (both end up clamped to 0
-		# power) - kept for the immediate, decided-in-advance response.
-		self.cooling = False
 		# Master on/off switch: while disabled, the FSM is held in IDLE and
 		# the controller tries not to drive the heater at all (output
 		# forced to 0) - off by default, enabled either by the user
@@ -91,9 +83,6 @@ class TempControllerBase(APid):
 	def set_heatrate_soll(self, value):
 		self.heatrate_soll_set = value
 
-	def set_cooling(self, value):
-		self.cooling = value
-
 	def set_enabled(self, value):
 		self.enabled = value
 
@@ -150,7 +139,7 @@ class TempControllerBase(APid):
 		self.pid_rate.process(heatrate_err, -self.heatrate_ist)
 		self.pid_cool.process(heatrate_err, -self.heatrate_ist)
 
-		if self.state == States.IDLE or self.cooling:
+		if self.state == States.IDLE:
 			self.y = 0
 		elif self.state == States.COOL:
 			self.y = self.pid_cool.get_y()

scripts/demos/sud/demo_sud.py

@@ -87,14 +87,6 @@ if __name__ == '__main__':
 			ramping = sud.state == SudState.RAMPING
 			phase = step['ramp'] if ramping and 'ramp' in step else step.get('hold', {})
 
-			# A ramp step whose target is below the current temperature can
-			# only be reached by passive cooling - force the heater off,
-			# mirroring tasks/sud.py's SudTask.
-			cooling = bool(ramping and 'ramp' in step and step['temperature'] < ctrl.get_theta_ist() - TEMP_REACHED_TOLERANCE)
-			ctrl.set_cooling(cooling)
-			if cooling:
-				print("  -> cooling down to {}".format(step['temperature']))
-
 			print(f"Step {step['number']}: {step['descr']}")
 			apply_plant_params(step)
 			if ramping and 'ramp' in step:

tasks/sud.py

@@ -61,17 +61,6 @@ class SudTask(ATask):
 		ramping = self.sud.state == SudState.RAMPING
 		phase = ramp if ramping and ramp is not None else hold
 
-		# A ramp step whose target is below the current temperature can
-		# only be reached by passive cooling - force the heater off for
-		# its whole duration (decided once, here, rather than re-checked
-		# every tick) instead of relying on the controller's own FSM to
-		# notice and idle out.
-		# bool(...): get_theta_ist() can be a numpy.float64 (Pot's transport
-		# delay line is a numpy array internally) - the '<' comparison would
-		# then yield numpy.bool_, which json.dumps() can't serialize.
-		cooling = bool(ramping and ramp is not None and step['temperature'] < self.tc.get_theta_ist() - TEMP_REACHED_TOLERANCE)
-		self.tc.set_cooling(cooling)
-
 		if step is not None:
 			self.apply_plant_params(step)
 			if ramping and ramp is not None:
@@ -87,7 +76,6 @@ class SudTask(ATask):
 			'Rate': ramp.get('rate') if ramp else None,
 			'Duration': hold.get('duration') if (hold is not None and not ramping) else None,
 			'WaitForUser': step.get('user_wait_for_continue', False) if step else None,
-			'Cooling': cooling,
 		}}))
 
 	def on_state_changed(self, value):