add udp example to readme

README.md

@@ -172,6 +172,20 @@ baudrate:9600
         .."Connection: keep-alive\r\nAccept: */*\r\n\r\n")
 ```
 
+####Or a simple http server
+   
+```lua
+    -- A simple http server
+    srv=net.createServer(net.TCP) 
+    srv:listen(80,function(conn) 
+      conn:on("receive",function(conn,payload) 
+        print(payload) 
+        conn:send("<h1> Hello, NodeMcu.</h1>")
+      end) 
+      conn:on("sent",function(conn) conn:close() end)
+    end)
+```
+
 ####Connect to MQTT Broker
 
 ```lua
@@ -208,18 +222,18 @@ m:close();
 
 ```
 
-####Or a simple http server
+#### UDP client and server
-   
 ```lua
-    -- A simple http server
+-- a udp server
-    srv=net.createServer(net.TCP) 
+s=net.createServer(net.UDP) 
-    srv:listen(80,function(conn) 
+s:on("receive",function(s,c) print(c) end)
-      conn:on("receive",function(conn,payload) 
+s:listen(5683)
-        print(payload) 
+
-        conn:send("<h1> Hello, NodeMcu.</h1>")
+-- a udp client
-      end) 
+cu=net.createConnection(net.UDP) 
-      conn:on("sent",function(conn) conn:close() end)
+cu:on("receive",function(cu,c) print(c) end) 
-    end)
+cu:connect(5683,"192.168.18.101") 
+cu:send("hello")
 ```
 
 ####Do something shining

examples/fragment.lua

@@ -25,15 +25,19 @@ ss=net.createServer(net.TCP) ss:listen(80,function(c) end)
 
 s=net.createServer(net.TCP) s:listen(80,function(c) c:on("receive",function(s,c) print(c) end) end)
 
-s=net.createServer(net.UDP) s:listen(5683,function(c) c:on("receive",function(s,c) print(c) end) end)
+s=net.createServer(net.UDP) 
+s:on("receive",function(s,c) print(c) end)
+s:listen(5683)
+
+su=net.createConnection(net.UDP) 
+su:on("receive",function(su,c) print(c) end) 
+su:connect(5683,"192.168.18.101") 
+su:send("hello")
 
 mm=node.list()
 for k, v in pairs(mm) do print('file:'..k..' len:'..v) end
 for k,v in pairs(d) do print("n:"..k..", s:"..v) end
-su=net.createConnection(net.UDP) 
+
-su:on("receive",function(su,c) print(c) end) 
-su:connect(5683,"192.168.0.66") 
-su:send("/v1/id")
 
 gpio.mode(0,gpio.INT) gpio.trig(0,"down",function(l) print("level="..l) end)
 
@@ -57,8 +61,6 @@ su:send("hello world")
 
 s=net.createServer(net.TCP) s:listen(8008,function(c) c:on("receive",function(s,c) print(c) pcall(loadstring(c)) end) end)
 
-s=net.createServer(net.UDP) s:listen(8888,function(c) c:on("receive",function(s,c) print(c) pcall(loadstring(c)) end) end)
-
 s=net.createServer(net.TCP) s:listen(8008,function(c) con_std = c function s_output(str) if(con_std~=nil) then con_std:send(str) end end 
 	node.output(s_output, 0) c:on("receive",function(c,l) node.input(l) end) c:on("disconnection",function(c) con_std = nil node.output(nil) end) end)