p910nd: add mdns support

Signed-off-by: Philipp Kerling <pkerling@casix.org>

net/p910nd/files/p910nd.config

@@ -1,5 +1,24 @@
 config p910nd
 	option device        /dev/usb/lp0
+	# Actual TCP port is 9100 plus this value
+	# Valid values are 0,1,2
 	option port          0
 	option bidirectional 1
 	option enabled       0
+
+	# mDNS support - see Bonjour Printing Specification for details concerning the values
+	# Be aware that you can only advertise one printer on this host via mDNS
+	# Set to 1 to enable
+	option mdns          0
+	# Human-readable printer make and model
+	option mdns_ty       'My Printer Manufacturer/Model'
+	# Human-readable location
+	option mdns_note     'Basement'
+	# Post-Script product string, including parenthesis
+	option mdns_product  ''
+	# IEEE-1284 Device ID MANUFACTURER/MFG string
+	option mdns_mfg      ''
+	# IEEE-1284 Device ID MODEL/MDL string
+	option mdns_mdl      ''
+	# IEEE-1284 Device ID COMMAND SET/CMD string
+	option mdns_cmd      ''