Connecting to the Web server

Question

Hai, My project is to update data to thinkspeak using arduino uno and wizfi210 (DFRobot wifi shield v2.2), and i found similar topic here [From QnA]Connecting to the Google Web server WizFi210/220 How can I connect to the google HTTP serer(Port 80) using <AT+NCTCP> command? I try the step using Arduino IDE serial monitor, and below the result ATI2 WizFi210 1.1.1.0(W) [OK] AT+WA=INSTIL_RESEARCH_LAB IP SubNet Gateway 10.8.132.250: 255.255.254.0: 10.8.132.254 [OK] AT+SETTIME=31/07/2013,10:21:11 [OK] AT+NCTCP=184.106.153.149,80 ///THINKSPEAK ip AND PORT [OK] {1B}S0GET / HTTP/1.1{0x0d}{0xa}{0x0d}{0xa}{1B}E [ERROR: INVALID INPUT] My question is: 1.How to use ESC sequence in arduino IDE as i already try “{1B}”,“(1B)”,“{27}”,“(27)”, still fail 2.How to post data to server (like thinkspeak)? Below my code in arduino int esc=27; Serial.print(esc); Serial.print("s0"); delay(1000); Serial.print("GET https://api.thingspeak.com/update?key=F2J4TD75PYVIWMQ1&field1=200 HTTP1.1
"); Serial.print("Host: api.thingspeak.com

"); Serial.print(esc); Serial.print("e"); Thanks

wizdaniel · Answer

Hi lhakim. You have to modify {xx} command to HEXA code. For example {1B} command means a hexa code of the ESC key function. {0x0d}{0x0a} means carriage return and line feeds as known as ENTER key function.(
) So you can get the response from cloud server after typing ESC, carriage return, line feeds instead of {xx}. You have written incorrect GET method.(GET api.thingspeak.com/update?key=F … field1=200 HTTP1.1
) If you want to connect and send queries to thingspeak.com, you can prefer the api note of thingspeak.com like the link below. thingspeak.com/docs/thingtweet/ thingspeak.com/docs/thinghttp/ Thingspeak.com needs the string of information(POST ~~, api_key ~~, message ~~) AND it have to be just sent as below rules. client.print(“POST /update HTTP/1.1
”); client.print(“Host: api.thingspeak.com
”); client.print(“Connection: close
”); client.print(“X-THINGSPEAKAPIKEY: “+writeAPIKey+”
”); client.print(“Content-Type: application/x-www-form-urlencoded
”); client.print(“Content-Length: “); client.print(tsData.length()); client.print(”

”); That source was included in the link below [url]http://community.thingspeak.com/arduino/ThingSpeakClient.pde[/url] Thanks.

lhakim · Answer

Hai wizdniel, Thanks for the reply I already manage to update the data to thinkspeak. What I do is use serial.write in arduino to send hexa code to serial.Below is my test code Serial.print("AT+NCTCP=184.106.153.149,80
"); //Attempt TCP client connection to Destination delay(1000); if(Serial.find("OK")) // if success, connect to network { Serial.println("TCP connection success"); digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); Serial.write(0x1b); Serial.print("S0"); Serial.print("GET /update?key=F2J4TD75PYVIWMQ1&field1="); Serial.print(data); Serial.print("HTTP/1.1
"); Serial.print("Host: api.thingspeak.com

"); Serial.write(0x1b); Serial.print("E"); delay(1000); }