DNS Failed for https://api.brightsky.dev [E][WiFiGeneric.cpp:739] hostByName()

[MHz000]

Hello Jacob
When I contact the brightsky server with the attached minimalistic ESP32 program I always get this error message.
[E][WiFiGeneric.cpp:739] hostByName(): DNS Failed for https://api.brightsky.dev/current_weather?lat=52&lon=7.6
[E][WiFiClientSecure.cpp:133] connect(): start_ssl_client: -1
Have other brightsky users had similar experiences? Has anyone reported a successful connection between ESP32 and the server?
It would be great if he/she shared his Arduino C++ code.
Why do I bother you again?
A connection to another server, e.g. to "www.howsmyssl.com" is established without any problems. The only difference I can see is in the access protocol.
I'm sorry if I bother you with things that are outside of your responsibility.
Thanks for the great project

[jdemaeyer]

Hi @MHz000,

sorry for the delay. There unfortunately is no attached ESP32 code, could you add that?

A possible issue here is that api.brightsky.dev has both an A and an AAAA record (i.e., it is available via IPv4 and IPv6), while www.howsmyssl.com has only an A record (it's only available via IPv4). Is there a way you could completely disable IPv6 on your ESP32, or otherwise change some settings so the DNS client queries the A record only?

[MHz000]

Hello Jacob,
delay... no problem at all. I'm grateful that you're even taking on my problem. I have to admit that I am completely unfamiliar with the Internet and WLAN protocols. I'm following examples I find online. I think I'm not alone in this. I appreciate it all the more and am grateful to you for your commitment.
You'll see a series of URLs at the beginning of the minimalist code.
Please don't feel obligated to waste your time.
I will look for a solution that prevents IPv6 addresses from initiating a connection. Let's see if Google continues to be my friend.
have a good time

/* https://www.brightsky.dev/ https://api.brightsky.dev/weather?lat=52&lon=7.6&date=2020-04-21 https://api.brightsky.dev/current_weather?lat=52&lon=7.6 // less data https://forum.arduino.cc/t/esp32-curl-with-wificlientsecure-h-for-api/1089308 https://RandomNerdTutorials.com/esp8266-nodemcu-https-requests/ // randomNerd https://microcontrollerslab.com/esp32-https-requests/ // microcontrollerslab https://github.com/espressif/arduino-esp32/issues/2778 <<< error discussion */

#include <Arduino.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>

const char* ssid = "worldgate";
const char* password = "balt1m0r3";

//const char* host = "https://api.ocr.space/Parse/Image";
//const char* host = "https://api.brightsky.dev/";
//const char* host = "https://api.brightsky.dev/weather?lat=52&lon=7.6&date=2020-04-21";
const char* host = "https://api.brightsky.dev/current_weather?lat=52&lon=7.6"; // https://api.
//const char* host = "www.howsmyssl.com"; //https://randomnerdtutorials.com/esp32-https-requests/

int nowifi;

void setup()
{
Serial.begin(115200);
Serial.printf("\n\nCompiled from: %s at: %s %s", FILE, DATE, TIME);
Serial.println("\nESP32_brightsky");

WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);

Serial.println("connectet to WiFi");
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
nowifi++;
Serial.print(nowifi);
if(nowifi > 4) {
ESP.restart();
}
}
Serial.println("");
Serial.println(WiFi.localIP());
Serial.println(WiFi.RSSI());
}

void loop() {
Serial.println("Connecting to " + String(host));
WiFiClientSecure client;
client.setInsecure();
/*
for(int i=0; i<3; i++){
if (client.connect(host, 443)) break;
Serial.println(i);
//ESP.restart();
delay(1000);
}
*/

if (client.connect(host, 443)) {
Serial.println("Successful connection!");
while(true){yield(); delay(100);};
/*
String Data = "apikey: helloworld";
client.println("POST " + url + " HTTP/1.1");
client.println("Host: " + String(host));
client.println("Content-Length: " + String(Data.length()+photo.length()));
client.println("Content-Type: application/image/jpg");
client.println();
client.print(Data);
*/
} else {
Serial.println("\nConnection to " + String(host) + " failed");
while(true){yield(); delay(100);};
}
client.stop();
delay(10000);
}
<\code>

[MHz000]

Jakob pls have a look at https://community.platformio.org/t/difference-between-ipv4-ipv6-no-server-connection-with-esp32/38150 enjoy the weekend Am Fr., 26. Jan. 2024 um 13:08 Uhr schrieb Jakob de Maeyer < ***@***.***>:

…

Hi @MHz000 <https://github.com/MHz000>, sorry for the delay. There unfortunately is no attached ESP32 code, could you add that? A possible issue here is that api.brightsky.dev has both an A and an AAAA record (i.e., it is available via IPv4 and IPv6), while www.howsmyssl.com has only an A record (it's only available via IPv4). Is there a way you could completely disable IPv6 on your ESP32, or otherwise change some settings so the DNS client queries the A record only? — Reply to this email directly, view it on GitHub <#161 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB42SGVXB2CF23REUPZ66LLYQOMDZAVCNFSM6AAAAABB6SSDX6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSMJRHE3TEMBUGY> . You are receiving this because you were mentioned.Message ID: ***@***.***>