Add support for M115 to virtual printer

src/octoprint/plugins/virtual_printer/virtual.py

@@ -94,6 +94,8 @@ class VirtualPrinter(object):
 
 		self._brokenM29 = settings().getBoolean(["devel", "virtualPrinter", "brokenM29"])
 
+		self._firmwareName = settings().get(["devel", "virtualPrinter", "firmwareName"])
+
 		self.currentLine = 0
 		self.lastN = 0
 
@@ -380,6 +382,10 @@ class VirtualPrinter(object):
 		self._send(output)
 		return True
 
+	def _gcode_M115(self, data):
+		output = "FIRMWARE_NAME:{} PROTOCOL_VERSION:1.0".format(self._firmwareName)
+		self._send(output)
+
 	def _gcode_M117(self, data):
 		# we'll just use this to echo a message, to allow playing around with pause triggers
 		if self._echoOnM117:

src/octoprint/settings.py

@@ -348,7 +348,8 @@ default_settings = {
 			"supportM112": True,
 			"echoOnM117": True,
 			"brokenM29": True,
-			"supportF": False
+			"supportF": False,
+			"firmwareName": "Virtual Marlin 1.0"
 		}
 	}
 }