Using the ThingSpeak Data Service with an UNO WiFi (via REST)

UNOWiFi_ThingSpeak_REST.ino

/*
|| @author   Brett Hagman <brett@roguerobotics.com>
|| @url      https://roguerobotics.com/
||
|| @description
|| | A simple example of an UNO WiFi sending data to the ThingSpeak Data Service (REST).
|| | https://thingspeak.com/
|| |
|| | In the Arduino IDE, you will need to add the "Arduino Uno WiFi Dev Ed Library" in the Library Manager.
|| | Sketch > Include Library > Manage Libraries...
|| #
*/

// ThingSpeak Data Service REST URL format:
// https://api.thingspeak.com/update?api_key=[yourAPIkey]&field1=[field1data]&field2=[field2data]

#include <UnoWiFiDevEd.h>

#define CONNECTOR     "rest"
#define SERVER        "api.thingspeak.com"
#define PRIVATEKEY    "YOURAPIKEYHERE"
#define TIMEBETWEEN   15000


void setup()
{
  Ciao.begin();
  Ciao.println("ThingSpeak REST Example");
}


void loop()
{
  char pathquery[200];

  // Creates the REST path and query 
  sprintf(pathquery, "/update?api_key=%s&field1=%d&field2=%s", PRIVATEKEY, getValue1(), String(getValue2()).c_str());

  // Display message in the WiFi Console:
  Ciao.println("Sending data...");
  Ciao.println(pathquery);

  // Upload the data, and wait for a response.
  CiaoData data = Ciao.write(CONNECTOR, SERVER, pathquery);

  if (!data.isEmpty())
  {
    Ciao.println( "State: " + String (data.get(1)) );
    Ciao.println( "Response: " + String (data.get(2)) );
  }
  else
  {
    Ciao.println("Write Error");
  }

  // Wait the required time between requests to store data.
  delay(TIMEBETWEEN);
}


int getValue1()
{
  static int currentValue = 0;
  currentValue += 1;
  if (currentValue >= 10)
    currentValue = 0;
  return currentValue;
}


float getValue2()
{
  static int currentValue = 0;
  currentValue += 1;
  if (currentValue >= 16)
    currentValue = 0;
  return sin(currentValue*PI/8.0);
}