ESP8266 Community Forum

- Sun Mar 31, 2019 5:37 pm #81467 I've tried to get this to work the whole day, and now I need help from the Community.

I got a Wemos D1 mini pro that I've got connected to a humidity/temp sensor. The next step is to upload the data online, and in the first step, I got a auth() function that I'm trying to figure out.

I got the api to work fine in Postman, but when I try to make the same call from the Wemos, I just get -1 as a httpCode, and no reponse.

Can you see what's wrong in the code? I guess it got to do with how I should write the body perhaps.. Btw, I store all the credentials in a "credentials.h" file and the variables are of String data type.

Code: Select all#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>
#include "ArduinoJson.h"
#include "credentials.h"
#include <ESP8266HTTPClient.h>
#include <ESP8266WiFi.h>

#define DHTPIN 2
#define DHTTYPE    DHT21

DHT_Unified dht(DHTPIN, DHTTYPE);

int delayMS = 3000;
String requestBody;

void setup() {
  Serial.begin(115200);
  // Initialize device.
  dht.begin();
  // Connect to Wi-Fi
  WiFi.begin(ssid, password);   //WiFi connection

  while (WiFi.status() != WL_CONNECTED) {  //Wait for the WiFI connection completion
    delay(500);                                                           
    Serial.println("Waiting for connection");
  }
  auth();

}

void loop() {
  // Get temperature event and print its value.
  sensors_event_t event;
  dht.temperature().getEvent(&event);
  if (isnan(event.temperature)) {
    Serial.println(F("Error reading temperature!"));
  }
  else {
    Serial.print(F("Temperature: "));
    Serial.print(event.temperature);
    Serial.println(F("°C"));
  }
  // Get humidity event and print its value.
  dht.humidity().getEvent(&event);
  if (isnan(event.relative_humidity)) {
    Serial.println(F("Error reading humidity!"));
  }
  else {
    Serial.print(F("Humidity: "));
    Serial.print(event.relative_humidity);
    Serial.println(F("%"));
  }
  // Delay between measurements.
  delay(delayMS);
}

void auth() {
  if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status
    HTTPClient http; //Declare object of class HTTPClient

    http.begin("login.salesforce.com/services/oauth2/token"); //Specify request destination
    http.addHeader("Content-Type", "application/x-www-form-urlencoded"); //Specify content-type header
    requestBody = "grant_type=password&client_id=" + consumerKey + "&client_secret=" + consumerSecret + "&username=" + userUsername + "&password=" + userPassword + "&format=urlencoded";

    int httpCode = http.POST(requestBody); //Send the request
    String payload = http.getString(); //Get the response payload
    Serial.print(F("httpCode: "));
    Serial.println(httpCode); //Print HTTP return code
    Serial.print(F("payload: "));
    Serial.println(payload); //Print request response payload
    if (httpCode == 200) {
      Serial.println("Connected to Salesforce!");
    } else {
      Serial.println("Failed to connect to Salesforce...");
    }
    http.end(); //Close connection
   
  } else {
    Serial.println("Error in WiFi connection");

  }
}