/*
Rui Santos
Complete project details at Complete project details at https://RandomNerdTutorials.com/esp32-http-get-post-arduino/
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files.
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
*/
#include <WiFi.h>
#include <HTTPClient.h>
int * getRandoms(int lower, int upper)
{
static int a[4];
int i;
srand(time(0));
for (i = 0; i < 4; i++) {
a[i] = (rand() %
(upper - lower + 1)) + lower;
}
return a;
}
//Your Domain name with URL path or IP address with path
const char* serverName = "http://httpbin.org/post";
// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastTime = 0;
// Timer set to 10 minutes (600000)
//unsigned long timerDelay = 600000;
// Set timer to 5 seconds (5000)
unsigned long timerDelay = 5000;
void setup() {
Serial.begin(115200);
WiFi.begin("Wokwi-GUEST", "", 6);
Serial.println("Connecting");
while(WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to WiFi network with IP Address: ");
Serial.println(WiFi.localIP());
Serial.println("Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.");
}
void loop() {
//Send an HTTP POST request every 10 minutes
int *p;
p = getRandoms(-1024,1024);
const char* machineId = "1234";
int pHIndex = *(p+1);
int turbidityIndex = *(p+2);
int hardWaterIndex = *(p+3);
int red = 123;
int green = 12;
int blue = 231;
char payload[1000];
snprintf (payload, sizeof(payload),"{\"machine_id\":%s,\"hard_water_index\":\"%d\",\"pH_index\":\"%d\",\"turbidity_index\":\"%d\",\"color_index\":{\"red\":%d,\"green\":%d,\"blue\":%d}}", machineId, pHIndex, turbidityIndex, hardWaterIndex, red, green, blue);
if ((millis() - lastTime) > timerDelay) {
//Check WiFi connection status
if(WiFi.status()== WL_CONNECTED){
WiFiClient client;
HTTPClient http;
// Your Domain name with URL path or IP address with path
http.begin(client, serverName);
// Specify content-type header
// http.addHeader("Content-Type", "application/x-www-form-urlencoded");
// // Data to send with HTTP POST
// String httpRequestData = "api_key=tPmAT5Ab3j7F9&sensor=BME280&value1=24.25&value2=49.54&value3=1005.14";
// // Send HTTP POST request
// int httpResponseCode = http.POST(httpRequestData);
// If you need an HTTP request with a content type: application/json, use the following:
http.addHeader("Content-Type", "application/json");
int httpResponseCode = http.POST("{}");
Serial.println(payload);
// If you need an HTTP request with a content type: text/plain
//http.addHeader("Content-Type", "text/plain");
//int httpResponseCode = http.POST("Hello, World!");
Serial.print("HTTP Response code: ");
Serial.println(httpResponseCode);
// Free resources
http.end();
}
else {
Serial.println("WiFi Disconnected");
}
lastTime = millis();
}
}