ESP8266 Community Forum

Posted: **Thu Oct 08, 2015 10:00 am**

Hello everyone,

I have been playing with the ESP8266 and it is really cool. Lately I am trying to interface with Thingspeak.com, which was partly successful. As I am not that familiar with http POST and GET requests I am somewhat flying blindly.

I was able to upload data to thingspeak, basically using the example from arduinoesp.com. Now, I am trying to read values from thingspeak via talkbackin order to control my device.

So what I need is to execute a command like this:

Code: Select allGET https://api.thingspeak.com/talkbacks/11111/commands/18?api_key=XXXXXX

or this:

Code: Select all

POST https://api.thingspeak.com/talkbacks/11111/commands/execute
     api_key=XXXXXXX

and get the returned value. I tried a couple of things, but could not get it to work. The internet mostly talks about uploading data to thingspeak, however was not able to find an example for the opposite direction.

Any ideas would be really helpful!

Thanks,
Tommi

Posted: **Tue Dec 08, 2015 5:10 pm**

any success with reading from thingspeak? :?:

Posted: **Tue Dec 08, 2015 11:06 pm**

I have been using the following the following arduino code with thing speak for the basic interpreter project.

Posting to thingspeak.

Code: Select allFetchWebUrl(String("api.thingspeak.com/update?key=" + Param0 + "&field" + Param1 + "=" + Param2));

Reading a filed from thingspeak

Code: Select all

MyOut =  FetchWebUrl(String("api.thingspeak.com/channels/" + Param1 + "/field/" + Param2 + "/last.xml?api_key=" + Param0));
    MyOut = MyOut.substring(MyOut.indexOf(String("<field" + Param2 + ">") ) + 8, MyOut.indexOf(String("</field" + Param2 + ">")));

function to fetch a url.

Code: Select all

#include <WiFiClient.h>
WiFiClient client; 

String FetchWebUrl(String URLtoGet)
{
  String str = "             ";
  String ServerToConnectTo = URLtoGet.substring(0, URLtoGet.indexOf("/"));
  String PageToGet = URLtoGet.substring(URLtoGet.indexOf("/"));
  // ServerToConnectTo ;
  //PageToGet = URLtoGet.substring(URLtoGet.indexOf("/"));

  Serial.println(ServerToConnectTo);
  Serial.println(PageToGet);


  if (client.connect(ServerToConnectTo.c_str() , 80))
  {
    client.print(String("GET " + PageToGet + " HTTP/1.1\r\nHost: " +  ServerToConnectTo + "\r\n\r\n"));
    delay(300);
    while (client.available())
    {
      delay(0);
      if (str.endsWith(String("\r\n\r\n")))  str = "";

      str.concat( (const char)client.read());
      delay(0);
    }



    client.stop();
    return str.substring(0, str.indexOf(String(String(char(10)) + "0" )  ));
  }
  client.stop();
  return "";
}

ESP8266 Community Forum

Talkback Thingsspeak || Get request

Talkback Thingsspeak || Get request

Re: Talkback Thingsspeak || Get request

Re: Talkback Thingsspeak || Get request