add example webap_toggle_pin.lua from #53. fix #53

lua_examples/webap_toggle_pin.lua

@@ -0,0 +1,32 @@
+wifi.setmode(wifi.SOFTAP);
+wifi.ap.config({ssid="test",pwd="12345678"});
+gpio.mode(1, gpio.OUTPUT)
+srv=net.createServer(net.TCP) 
+srv:listen(80,function(conn) 
+    conn:on("receive", function(client,request)
+        local buf = "";
+        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP");
+        if(method == nil)then 
+            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP"); 
+        end
+        local _GET = {}
+        if (vars ~= nil)then 
+            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do 
+                _GET[k] = v 
+            end 
+        end
+        buf = buf.."<h1> Hello, NodeMcu.</h1><form src=\"/\">Turn PIN1 <select name=\"pin\" onchange=\"form.submit()\">";
+        local _on,_off = "",""
+        if(_GET.pin == "ON")then
+              _on = " selected=true";
+              gpio.write(1, gpio.HIGH);
+        elseif(_GET.pin == "OFF")then
+              _off = " selected=\"true\"";
+              gpio.write(1, gpio.LOW);
+        end
+        buf = buf.."<option".._on..">ON</opton><option".._off..">OFF</option></select></form>";
+        client:send(buf);
+        client:close();
+        collectgarbage();
+    end)
+end)