ESP8266 Community Forum

- Thu Nov 05, 2020 2:09 am #89309 I have setup a sketch in Arduino IDE in order to use WiFi together with Firebase and HTTPS requests on my ESP8266-12F module (AZ Delivery D1 mini NodeMCU)

ESP8266 board version 2.7.4
FirebaseArduino version 0.3 (from 2018? Is there a newer one I didn't manage to find?) together with ArduinoJson 5.13.1
OR FirebaseESP8266 version 3.0.2


For Firebase access I've tried both FirebaseArduino and FirebaseESP8266, both with essentially the same problem:

In setup() I open up a WiFi connection, and then in loop() I access Firebase to retrieve a list of strings of length 10, about 160 of those strings but the number and keys of those strings are unknown in advance. Upto this point, everything works like a charm. I can even loop over the String[] and show all the retrieved Firebase keys.

But, as soon as I open an HTTPS client connection using

Code: Select allWiFiClientSecure client;
client.setInsecure();    // to avoid fingerprint stuff
if(!client.connect()) {
  Serial.println("connection failed");
} else {
  ... // do stuff like client.print("GET ......")
}


I will either see "connection failed" (for FirebaseArduino) or I will get a soft WDT reset (for FirebaseESP8266).

Opening an HTTPS client connection to those URLs with no previous Firebase access works consistently.

What I would like to do: For each 10 character string retrieved from Firebase, I would like to connect to an HTTPS server related to that string and retrieve some information I would like to store in Firebase at a path related to that string.

By the way, I have also attached a SSD1306 OLED display to my ESP8266

Essential code parts:

Code: Select all#include <Arduino.h>

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>

#include <WiFiClientSecureBearSSL.h>


#include <WiFiClient.h>
#include <Wire.h>
#include <SSD1306.h>

#include <FirebaseESP8266.h>

#define FIREBASE_HOST "xxxxxxxxxxxxxxxxxxxxxxx"
#define FIREBASE_AUTH "yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy"

#define OLED_ADDRESS                0x3C //you may need to change this, this is the OLED I2C address. 

SSD1306 display(OLED_ADDRESS, D2, D1);

ESP8266WiFiMulti WiFiMulti;

FirebaseData firebaseData;
...

void setup() {
  ...
  WiFi.mode(WIFI_STA);
  WiFiMulti.addAP("aaaaaaaaaaaa", "bbbbbbbbbbbbbbbbbbbb");

  while(WiFiMulti.run() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  ...
}

void loop() {
  WiFiClientSecure client;
  client.setInsecure();

  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
  Firebase.reconnectWiFi(true);
  firebaseData.setBSSLBufferSize(3072, 512);
  firebaseData.setResponseSize(3072);
 
  if(Firebase.get(firebaseData, "/my/path")){
    Serial.print("Read object of type ");
    Serial.println(firebaseData.dataType());

    FirebaseJson& json = firebaseData.jsonObject();
    size_t len = json.iteratorBegin();
    String key, value = "";
    int type = 0;
    String buffer[len];
    for (size_t i = 0; i < len; i++)
    {
        json.iteratorGet(i, type, key, value);
        buffer[i] = key;
    }
    json.iteratorEnd();
    delay(500);

    // check single IDs
    for(size_t i = 0; i < len; i++) {

      String url = "/" + buffer[i];

      if (!client.connect(host, httpsPort)) {  // the problems happen here
        Serial.println("connection failed");
      } else {
        ...
      }
      client.stop();
    }
   
  }
}