Change telnet server to work on the console rather than the uart

nodemcu/telnet.lua

@@ -1,19 +1,19 @@
 return function(port)
-	function connected(conn)
-		negotiate = string.char(255, 253, 34, 255, 250, 34, 1, 0, 255, 240, 255, 251, 1)
-		conn:send(negotiate)
-		conn:on("receive", function(conn, pl)
-			conn:send('.')
-			uart.write(0, pl)
-		end)
-	end
-
-	function startTelnet()
-		print("Starting Telnet server")
-		sv = net.createServer(net.TCP, 180)
-		sv:listen(23, connected)
-		print("Telnet server now started")
-	end
-	startTelnet()
---	uart.setup(0, 9600, 8, 0, 1, 0)
+    -- a simple telnet server
+    s=net.createServer(net.TCP,180)
+    s:listen(port,function(c)
+       function s_output(str)
+          if(c~=nil)
+             then c:send(str)
+          end
+       end
+       node.output(s_output, 0)   -- re-direct output to function s_ouput.
+       c:on("receive",function(c,l)
+          node.input(l)           -- works like pcall(loadstring(l)) but support multiple separate line
+       end)
+       c:on("disconnection",function(c)
+          node.output(nil)        -- un-regist the redirect output function, output goes to serial
+       end)
+       print("Welcome to NodeMcu world.")
+    end)
 end