View difference between Paste ID: 7qJ3iAZ9 and Cd9HtcBz

 os.pullEvent = os.pullEventRaw
 local auth_channel = 54321
 local reply_channel = 234
 local authCard = {}
 
 --debugging flag
 debug = 0
 
 modem = peripheral.find("modem")
 
-local sides = peripheral.getNames()
+--Make sure there's an attached modem, else die
-for k,side in pairs(sides) do
+
-	if peripheral.getType(side) == "drive" then
+
-		rSide = side
+
-		reader = peripheral.wrap(rSide)
+
 --Open the reply channel for listening
 modem.open(reply_channel)
 
-if not reader then
+
-	error("Card reader not detected.")
+
 	print("ProxReader v1.0")
 	print("scs.mtweather.mil")
 	print("Authorized Users Only")
 	print("Access Attempts are Logged")
 	print("Please insert and remove your Prox Card...")
-	term.clear()
+
-	term.setCursorPos(1,1)
+	--Wait for a user to insert a disk into any attached drive
-	term.setTextColor(colors.blue)
+
-	print("ProxyReader v1.5")
+
 	--Get a list of attached devices; take the drive, and find its side
 	local sides = peripheral.getNames()
 	for k,side in pairs(sides) do
-	print("Please insert your Proxy Card...")
+		if peripheral.getType(side) == "drive" then
 			rSide = side
 			reader = peripheral.wrap(rSide)
 
 			--Debug stuff
 			if debug then
 			print("Reader is on side "..rSide)
 			end
-		term.setTextColor(colors.lime)
+
 		end
-		print("Take your Proxy Card and enter.")
+
-		local redSides = {"left", "right", "top", "bottom", "back", "front"}
+
-		for i = 1, #redSides do
+	--Get the ID of the card and send it for authentication
-			redstone.setOutput(redSides[i], true)
+
 	modem.transmit(auth_channel, reply_channel, authCard)
 
-		for i = 1, #redSides do
+	--Debug stuff
 	if debug then
 	print("Sending authID: "..authCard)
 	print("Sent on channel: "..auth_channel)
 	print("Expect reply on channel: "..reply_channel)
-		term.setTextColor(colors.red)
+
-		print("Not a valid proxy card.")
+
 	--Wait for auth's reply on replyChan
 	local event, modem_side, authChan, replyChan, message = os.pullEvent("modem_message")
 
 	--Debug stuff
 	if debug then
 	print("Received event: "..event)
 	print("I can reply on channel: "..replyChan)
 	print("Message is: "..message)
 	end
 
 	if message == "valid" then
 		disk.eject(rSide)
 		term.clear()
 		term.setCursorPos(1,1)
 		print("Welcome!")
 
 		--Get all sides, and toggle all redstone signals
 		local redSides = { "left", "right", "top", "bottom", "back", "front" }
 
 		--Debug stuff
 		if debug then
 		print("Enabling redstone on all sides")
 		end
 
 		for i=1, #redSides do
   			redstone.setOutput(redSides[i], true)
 		end
 
 		sleep(3)
 
 		--Debug stuff
 		if debug then
 		print("Disabling redstone on all sides")
 		end
 
 		for i=1, #redSides do
 			redstone.setOutput(redSides[i], false)
 		end
 	else
 		disk.eject(rSide)
 		term.clear()
 		term.setCursorPos(1,1)
 		print("Not a valid prox card.")
 		sleep(2)
 	end
 end