Shorter timeout during heatup & no scary message on end

Set read timeout on serial port to a much shorter value (default 2.0s)
during a heatup. Firmware should usually send the current temperature
back every second, so if that stops we can consider the heatup to be finished
even if we don't see an ok.

That is important in cases such as SD printing, where we might see a
heatup sequence we didn't trigger ourselves, during which we shouldn't spam
the printer with commands it potentially can't process but after which we
still should take up normal communication again. In case of a heatup sequence
triggered by an SD print we won't see an ok and hence only can now through a
timeout that things are now done printer side. In such a case the user should not
get thrown a scary timeout message in their general direction either.

Solves #1409

src/octoprint/plugins/virtual_printer/virtual.py

@@ -16,7 +16,7 @@ from serial import SerialTimeoutException
 from octoprint.settings import settings
 from octoprint.plugin import plugin_manager
 
-class VirtualPrinter():
+class VirtualPrinter(object):
 	command_regex = re.compile("[GM]\d+")
 	sleep_regex = re.compile("sleep (\d+)")
 	sleep_after_regex = re.compile("sleep_after ([GM]\d+) (\d+)")
@@ -25,7 +25,7 @@ class VirtualPrinter():
 
 	def __init__(self, read_timeout=5.0, write_timeout=10.0):
 		import logging
-		self._logger = logging.getLogger("octoprint.plugin.virtual_printer.VirtualPrinter")
+		self._logger = logging.getLogger("octoprint.plugins.virtual_printer.VirtualPrinter")
 
 		self._read_timeout = read_timeout
 		self._write_timeout = write_timeout
@@ -108,6 +108,24 @@ class VirtualPrinter():
 		return "VIRTUAL(read_timeout={read_timeout},write_timeout={write_timeout},options={options})"\
 			.format(read_timeout=self._read_timeout, write_timeout=self._write_timeout, options=settings().get(["devel", "virtualPrinter"]))
 
+	@property
+	def timeout(self):
+		return self._read_timeout
+
+	@timeout.setter
+	def timeout(self, value):
+		self._logger.debug("Setting read timeout to {}s".format(value))
+		self._read_timeout = value
+
+	@property
+	def write_timeout(self):
+		return self._write_timeout
+
+	@write_timeout.setter
+	def write_timeout(self, value):
+		self._logger.debug("Setting write timeout to {}s".format(value))
+		self._write_timeout = value
+
 	def _clearQueue(self, queue):
 		try:
 			while queue.get(block=False):

src/octoprint/settings.py

@@ -81,6 +81,7 @@ default_settings = {
 			"detection": 0.5,
 			"connection": 10,
 			"communication": 30,
+			"heatup": 2,
 			"temperature": 5,
 			"sdStatus": 1
 		},

src/octoprint/util/comm.py

@@ -956,7 +956,10 @@ class MachineCom(object):
 				if line is None:
 					break
 				if line.strip() is not "":
-					self._timeout = get_new_timeout("communication", self._timeout_intervals)
+					if self._heating:
+						self._timeout = get_new_timeout("heatup", self._timeout_intervals)
+					else:
+						self._timeout = get_new_timeout("communication", self._timeout_intervals)
 
 				##~~ debugging output handling
 				if line.startswith("//"):
@@ -1059,8 +1062,7 @@ class MachineCom(object):
 				elif ' T:' in line or line.startswith('T:') or ' T0:' in line or line.startswith('T0:') or ((' B:' in line or line.startswith('B:')) and not 'A:' in line):
 					if not disable_external_heatup_detection and not line.strip().startswith("ok") and not self._heating:
 						self._logger.debug("Externally triggered heatup detected")
-						self._heating = True
-						self._heatupWaitStartTime = time.time()
+						self._track_heatup()
 					self._processTemperatures(line)
 					self._callback.on_comm_temperature_update(self._temp, self._bedTemp)
 
@@ -1259,10 +1261,7 @@ class MachineCom(object):
 			self._currentTool = self._formerTool
 			self._formerTool = None
 
-		if self._heatupWaitStartTime:
-			self._heatupWaitTimeLost = self._heatupWaitTimeLost + (time.time() - self._heatupWaitStartTime)
-			self._heatupWaitStartTime = None
-			self._heating = False
+		self._finish_heatup()
 
 		if not self._state in (self.STATE_PRINTING, self.STATE_OPERATIONAL, self.STATE_PAUSED):
 			return
@@ -1291,6 +1290,10 @@ class MachineCom(object):
 			self._resendSameCommand()
 			self._clear_to_send.set()
 
+		elif self._heating:
+			self._logger.debug("Timeout while in an active heatup, considering heatup to be over then")
+			self._finish_heatup()
+
 		else:
 			self._log("Communication timeout while printing, trying to trigger response from printer. " + general_message)
 			self._sendCommand("M105", cmd_type="temperature")
@@ -1298,6 +1301,18 @@ class MachineCom(object):
 
 		return
 
+	def _track_heatup(self):
+		self._heating = True
+		self._heatupWaitStartTime = time.time()
+		self._serial.timeout = settings().getFloat(["serial", "timeout", "heatup"])
+
+	def _finish_heatup(self):
+		if self._heatupWaitStartTime:
+			self._heatupWaitTimeLost = self._heatupWaitTimeLost + (time.time() - self._heatupWaitStartTime)
+			self._heatupWaitStartTime = None
+			self._heating = False
+			self._serial.timeout = settings().getFloat(["serial", "timeout", "communication"])
+
 	def _continue_sending(self):
 		if self._state == self.STATE_PRINTING:
 			if not self._sendFromQueue() and not self.isSdPrinting():
@@ -2036,15 +2051,13 @@ class MachineCom(object):
 				pass
 
 	def _gcode_M109_sent(self, cmd, cmd_type=None):
-		self._heatupWaitStartTime = time.time()
 		self._long_running_command = True
-		self._heating = True
+		self._track_heatup()
 		self._gcode_M104_sent(cmd, cmd_type, wait=True)
 
 	def _gcode_M190_sent(self, cmd, cmd_type=None):
-		self._heatupWaitStartTime = time.time()
 		self._long_running_command = True
-		self._heating = True
+		self._track_heatup()
 		self._gcode_M140_sent(cmd, cmd_type, wait=True)
 
 	def _gcode_M110_sending(self, cmd, cmd_type=None):