DweetPost_LAN8720.ino

/****************************************************************************************************************************
  DweetPost_LAN8720.ino - Simple Arduino web server sample for Ethernet shield

  For STM32 with built-in Ethernet LAN8742A (Nucleo-144, DISCOVERY, etc) or W5x00/ENC28J60 shield/module

  EthernetWebServer_STM32 is a library for the STM32 running Ethernet WebServer

  Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Built by Khoi Hoang https://github.com/khoih-prog/EthernetWebServer_STM32
  Licensed under MIT license

  Connects to dweet.io once every ten seconds, sends a POST request and a request body.

  Shows how to use Strings to assemble path and parse content from response. dweet.io expects:
  https://dweet.io/get/latest/dweet/for/thingName

  For more on dweet.io, see https://dweet.io/play/

  created 15 Feb 2016
  modified 22 Jan 2019
  by Tom Igoe
 *****************************************************************************************************************************/

#include "defines.h"

const char serverAddress[] = "dweet.io";  // server address
int port = 80;

EthernetClient      client;
EthernetHttpClient  httpClient(client, serverAddress, port);

void setup()
{
  Serial.begin(115200);
  delay(2000);

  Serial.print("\nStarting DweetPost_LAN8720 on " + String(BOARD_NAME));
  Serial.println(" with " + String(SHIELD_TYPE));
  Serial.println(ETHERNET_WEBSERVER_STM32_VERSION);

  // start the ethernet connection and the server:
  // Use DHCP dynamic IP and random mac
  uint16_t index = millis() % NUMBER_OF_MAC;
  // Use Static IP
  //Ethernet.begin(mac[index], ip);
  Ethernet.begin(mac[index]);

  Serial.print(F("Using mac index = "));
  Serial.println(index);

  Serial.print(F("Connected! IP address: "));
  Serial.println(Ethernet.localIP());
}

void loop()
{
  // assemble the path for the POST message:
  String dweetName = "scandalous-cheese-hoarder";
  String path = "/dweet/for/" + dweetName;
  String contentType = "application/json";

  // assemble the body of the POST message:
  int sensorValue = analogRead(A0);
  String postData = "{\"sensorValue\":\"";
  postData += sensorValue;
  postData += "\"}";

  Serial.println("making POST request");

  // send the POST request
  httpClient.post(path, contentType, postData);

  // read the status code and body of the response
  int statusCode = httpClient.responseStatusCode();
  String response = httpClient.responseBody();

  Serial.print("Status code: ");
  Serial.println(statusCode);
  Serial.print("Response: ");
  Serial.println(response);

  Serial.println("Wait ten seconds\n");
  delay(10000);
}