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I have an Arduino Uno and for Wifi an ESP8266.

My ESP8266 Firmware is

AT+GMR

AT version:0.40.0.0(Aug  8 2015 14:45:58)
SDK version:1.3.0
Ai-Thinker Technology Co.,Ltd.
Build:1.3.0.2 Sep 11 2015 11:48:04

baund = 115200,
 Both NL & CR

Server -- www.linysoft.com

The URL I want to send is either: http://www.linysoft.com/arduino/?light=off OR http://www.linysoft.com/arduino/?light=on.

Depending on to the link I send the result should be either ==> on or ==> off on the page http://www.linysoft.com/arduino/light.json.

Now I want to send an HTTP request (Weblink - http://www.linysoft.com/arduino/?light=on) so it can write according to that link "on" in the light.json page.

The AT command I am sending (my wifi module is connected to my wifi automatically):

WIFI CONNECTED
WIFI GOT IP

AT+CWMODE=1

OK

AT+CIPMUX=1

OK

AT+CIPSTART=0,"TCP","www.linysoft.com",80

0,CONNECT

OK

AT+CIPSEND=0,200

OK
>

Here I am getting a problem after this > I can't send **GET /arduino/?light=on**. I also tried GET /arduino/?light=on HTTP/1.0\r\n.

After putting this line in the textbox, I press the Enter button or Send Button, but nothing happens.

It is stuck here > for some time. And then it shows me:

OK
> 0,CLOSED

Pin Connection

ARDUINO UNO        ESP8266
RX  -------------->  TX
TX  --------------> RX
VCC--------------> 3.3
CH_PD ----------> 3.3
GND -------------> GND
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What technology are you using to connect to the Internet, and hence to "www.linysoft.com"? How have you checked that WiFi access point, and internet connection works? – gbulmer Jan 10 at 15:32
up vote 1 down vote

The domain is missing. Try this instead: 

GET http://www.linysoft.com/arduino/?light=on HTTP/1.0\r\n\r\n

Cheers!

Ref. http://contractorwolf.com/esp8266-wifi-arduino-micro/

share|improve this answer
    
I didn't know that was allowed in HTTP, as browsers use the Host header. But apparently using an absoluteURI is allowed. – Gerben Jan 10 at 16:29
up vote 1 down vote

linysoft.com is a virtual host. Just try going to http://100.42.56.28/ and see that the connection is reset.

So after the GET /arduino/?light=on, you have to also send Host: www.linysoft.com (on the next line).

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up vote 0 down vote

Just found out a POST wouldn't work. Try this GET request to turn on the light. 

    GET /arduino/?light=on HTTP/1.1\r\nHost: www.linysoft.com\r\n\r\n

Then you can get the status of the LED by GETting light.json like this:

    GET /arduino/light.json HTTP/1.1\r\nHost: www.linysoft.com\r\n\r\n
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