Merge branch 'udp' into dev

test/testudp.lua

@@ -0,0 +1,26 @@
+local skynet = require "skynet"
+local socket = require "socket"
+
+local function server()
+	local host
+	host = socket.udp(function(data, sz, from)
+		local str = skynet.tostring(data,sz)	-- skynet.tostring should call only once, because it will free the pointer data
+		print("server recv", str, socket.udp_address(from))
+		socket.sendto(host, from, "OK " .. str)
+	end , "127.0.0.1", 8765)	-- bind an address
+end
+
+local function client()
+	local c = socket.udp(function(data, sz, from)
+		print("client recv", skynet.tostring(data,sz), socket.udp_address(from))
+	end)
+	socket.udp_connect(c, "127.0.0.1", 8765)
+	for i=1,20 do
+		socket.write(c, "hello " .. i)	-- write to the address by udp_connect binding
+	end
+end
+
+skynet.start(function()
+	skynet.fork(server)
+	skynet.fork(client)
+end)