A few questions about connecting arduino to the internet via wifi using router

Using Arduino Networking, Protocols, and Devices
12

It is not important to "Direct connection" as long as your project is running without problem. :slight_smile:

If you had this sketch upload to your Arduino Electronics & Automation Engineering T/A Ocean Controls > PC Based > Relayduino USB/RS-485 IO Module (8-28VDC) and you had the following file put in the /www/cgi-bin folder of router . Then you can control the Arduino with one line URL without knowing how it work.

Save the following file as luaSerial and save it to /www/cgi-bin directory of router & set its permission to 0755

#!/usr/bin/lua

-- LuaSerial interface
-- for Wireless Router Home Automation
-- by SM.Ching http://ediy.com.my
--
-- Put this file to /www/cgi-bin directory of router
-- use code below to allow 0755 permission for luaSerial file
-- chmod 0755 /www/cgi-bin/luaSerial
--
-- protocol (Receiving from serial port):
-- @aaccpp 
-- where aa is the Arduino address ranged from 0 to 255 (0 means all Arduino)
-- where cc in the command (TG, ON, OF, RS)
-- where pp is the parameters or channel ranged from 0 to 8 (0 means all channes)
-- to toggle output for channel 1: @00TG1
-- to get status from all output: @00RS0
--
-- protocal (Sending to serial port):
-- #aapp
-- where aa is the Arduino address ranged from 0 to 255 (0 means all Arduino)
-- where pp is either 1 or 0 (ON or OFF for a channel), or ranged from 0(00000000) to 255(11111111) for all channels

port= "/dev/ttyUSB0"
serialout= io.open(port,"w")  --open serial port and prepare to write data
serialin= io.open(port,"r")   --open serial port and prepare to read data

function readSerial()
	while true do
		--serialData= nil
		serialData= serialin:read();serialin:flush() -- read data from serial port

		if string.len(serialData)>0 then
			serData = serialData
		end

		if  string.len(serialData) == 0 then
			return serData
		end

	end
end

function toggleOutput()
	serialout:write(queryStr)
	queryResult= readSerial()						-- read data from serial port
	queryResult= string.sub(queryResult,5)    -- from character 5 until the end, eg. 1 (is on)
       if queryResult== "1" then
  		cmd="of"
	else
		cmd="on"
	end
	str= address..cmd..parameter					-- eg. @00of2 (including \r)
end

----------------------------------------------------------------

str= os.getenv("QUERY_STRING").."\r"  	-- get message from URL and terminate with carriage return(\r), eg. @00on2
str= string.upper(str)
address= string.sub(str,1,3)				-- get first 3 characters, eg. @00
cmd= string.sub(str,4,5) 	 				-- from character 4 until character 5, eg. on
parameter= string.sub(str,6)           -- from character 6 until the end, eg. 2 (including \r)
queryStr= address.."rs"..parameter		-- eg. @00rs2

if cmd=="TG" then
  toggleOutput()
end

serialout:write(str) 				-- write string(str) to serial port
readSerial()							-- read data from serial port, use to clear serial buffer
serialout:write(queryStr)			-- write string(queryStr) to serial port
print(readSerial())					-- read data from serial port and display it

use the following command to control Arduino:
Turn on all out
http://192.168.1.1/cgi-bin/luaSerial?@00on0

Turn on output 1
http://192.168.1.1/cgi-bin/luaSerial?@00on1

Turn off all output
http://192.168.1.1/cgi-bin/luaSerial?@00of0

Turn off output 1
http://192.168.1.1/cgi-bin/luaSerial?@00of1

Query Arduino (Get status)
http://192.168.1.1/cgi-bin/luaSerial?@00RS0

Query first output
http://192.168.1.1/cgi-bin/luaSerial?@00RS1

If you know HTML and Javascript, you can make a very nice web interface.

I had made a simple web interface to control the Arduino.
http://arduino.cc/forum/index.php/topic,127175.0.html

All the while I'm using Borland Delphi for my projects. I have no experience on HTML and Javascript, the code might be a bit messy :blush: