The Force of Things

#include "HttpClient/HttpClient.h"
#include "application.h"

#define VARIABLE_ID "YOUR-VARIABLE-ID"
#define TOKEN "YOUR-UBIDOTS-TOKEN"

HttpClient http;
int value_index = 0;
String value_string, value;   // We'll use these strings to parse the response from Ubidots
float f_value;
unsigned int nextTime = 0;    // Next time to contact the server

http_header_t headers[] = {
    { "Content-Type", "application/json" },
    { NULL, NULL } // NOTE: Always terminate headers will NULL
};

http_request_t request;
http_response_t response;

void setup() {
    request.hostname = "things.ubidots.com";
    request.port = 80;
    request.path = "/api/v1.6/variables/"VARIABLE_ID"/values?page_size=1&token="TOKEN;  // Note "page_size=1" asks Ubidots only for the last value
    Serial.begin(9600);
}

void loop() {
    if (nextTime > millis()) {
        return;
    }

    // Make Get request
    http.get(request, response, headers);

    if (response.status == 200){

        // Look for the index of the JSON string "value:"
        value_index = response.body.indexOf("\"value\": ");

        // Chop the response from that index, until the end of the response string
        value_string = response.body.substring(value_index);

        // Get the value that is between the nine (9) characters of "\"-v-a-l-u-e-\"-: " and the next comma
        value = value_string.substring(9, value_string.indexOf(","));

        // See the value in the serial console, then cast it to a float (most sensor readings have decimals!)
        Serial.println(value);
        f_value = value.toFloat();

        if (f_value > 0){
            // Add your custom function to turn on the lights here
            Serial.println("Lights turned ON");
        }
        else{
            // Add your custom function to turn off the lights here
            Serial.println("Lights turned OFF");
        }

    }
    else {
        Serial.println("The server rejected the request with the response:");
        Serial.println(response.status);
        Serial.println(response.body);
    }

    nextTime = millis() + 1000;
}