ESP32:MqttHive:1:25: fatal error: ESP8266WiFi.h: No such file or directory

Hello,
after generating the certs.ar and Image Uploaded I am getting this error from my ESP32 board:
"Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: “ESP32 Dev Module …
MqttHive:1:25: fatal error: ESP8266WiFi.h: No such file or directory
compilation terminated.
exit status 1
ESP8266WiFi.h: No such file or directory”
How can i resolve this issue ?

Hi @shararku ,

It seems that you are following the instructions for ESP8266 board, while you have ESP32 board. You need to replace all ESP8266-specific libraries with ESP32-specific ones.

Kind regards,
Dasha from HiveMQ Team

Hello HiveMQ,
Thank you very much for your reply , I will try to follow your instructions and hopefully will solve the issue soon !
Best wishes
Sharar

Hello HiveMQ,

So i tried to “replace all ESP8266-specific libraries with ESP32-specific ones.” but i started to get more errors and more searches and google has no clue on how to go about it !
I hope you could clarify which #include to replace with which or some pointer to where the solution could be found .
Best wishes
Sharar

Hi @shararku ,

You indicated you get more errors - could you please be specific: what action you did, what error you got.

You can also try to run your code on ESP32 simulator like this: sketch.ino - Wokwi Arduino and ESP32 Simulator

Kind regards,
Dasha from HiveMQ Team

Hello HiveMQ,
Thank you very much for your support but It looks like it is going to be a long, drawn out trial and error process so I better seek an alternative solution to my data needs.
Should you finish developing an ESP32 example please let me know .
Best wishes
Sharar

Hi, Here a template for the ESP32 using WIFI to connect to the broker. Enjoy, just replace the XXXX with your value

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

//---- WiFi settings
const char* ssid = “XXXX”;
const char* password = “XXXX”;
//---- MQTT Broker settings
const char* mqtt_server = “XXXX”; // replace with your broker url
const char* mqtt_username = “XXXX”;
const char* mqtt_password = “XXXX”;
const int mqtt_port =8883;

WiFiClientSecure espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;

#define MSG_BUFFER_SIZE (50)
char msg[MSG_BUFFER_SIZE];

const char* sensor1_topic= “sensor1”;
const char* sensor2_topic=“sensor2”;

static const char *root_ca PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
)EOF";

void setup() {

Serial.begin(9600);
Serial.print("\nConnecting to ");
Serial.println(ssid);

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

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(“.”);
}
randomSeed(micros());
Serial.println("\nWiFi connected\nIP address: ");
Serial.println(WiFi.localIP());

while (!Serial) delay(1);

espClient.setCACert(root_ca);
client.setServer(mqtt_server, mqtt_port);
client.setCallback(callback);
}

void loop() {

  if (!client.connected()) reconnect();
  client.loop();

publishMessage(sensor1_topic,String(XXXX),true);    
publishMessage(sensor2_topic,String(XXXX),true);

}

//=======================================================================Function=================================================================================

void reconnect() {
// Loop until we’re reconnected
while (!client.connected()) {
Serial.print(“Attempting MQTT connection…”);
String clientId = “ESP8266Client-”; // Create a random client ID
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str(), mqtt_username, mqtt_password)) {
Serial.println(“connected”);

  client.subscribe(command1_topic);   // subscribe the topics here
  //client.subscribe(command2_topic);   // subscribe the topics here
} else {
  Serial.print("failed, rc=");
  Serial.print(client.state());
  Serial.println(" try again in 5 seconds");   // Wait 5 seconds before retrying
  delay(5000);
}

}
}

//=======================================
// This void is called every time we have a message from the broker

void callback(char* topic, byte* payload, unsigned int length) {
String incommingMessage = “”;
for (int i = 0; i < length; i++) incommingMessage+=(char)payload[i];
Serial.println(“Message arrived [”+String(topic)+“]”+incommingMessage);
// check for other commands
/* else if( strcmp(topic,command2_topic) == 0){
if (incommingMessage.equals(“1”)) { } // do something else
}
*/
}

//======================================= publising as string
void publishMessage(const char* topic, String payload , boolean retained){
if (client.publish(topic, payload.c_str(), true))
Serial.println(“Message publised [”+String(topic)+"]: "+payload);
}

2 Likes

Hello Mike,
Thanks alot for your help(code) i will try it soon but i have small problem with user name for the MQTT,once resolved i will test it .
Best Regards
Sharar

i did a small HOW TO on an other topic on how to use ESP32 with HIVEMQ and NODERED

there is more information there :slight_smile:

Happy coding !

Hello Mike,
I just tested your code but unfortunately it does not work ! I hope you can find a fix for it .
Best wishes
Sharar

"Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: “ESP32 Dev Module, Disabled, Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS), 240MHz (WiFi/BT), QIO, 80MHz, 4MB (32Mb), 921600, None”

MqttHive2:8:1: error: stray ‘\342’ in program
const char* ssid = “Farxxxxxx”;
^
MqttHive2:8:1: error: stray ‘\200’ in program
MqttHive2:8:1: error: stray ‘\234’ in program
MqttHive2:8:1: error: stray ‘\342’ in program
MqttHive2:8:1: error: stray ‘\200’ in program
MqttHive2:8:1: error: stray ‘\235’ in program
MqttHive2:9:1: error: stray ‘\342’ in program
const char* password = “xxxxxxxxx”;
^
MqttHive2:9:1: error: stray ‘\200’ in program
MqttHive2:9:1: error: stray ‘\234’ in program
MqttHive2:9:1: error: stray ‘\342’ in program
MqttHive2:9:1: error: stray ‘\200’ in program
MqttHive2:9:1: error: stray ‘\235’ in program
MqttHive2:11:1: error: stray ‘\342’ in program
const char* mqtt_server = “xxxxxxxxxxxxxxxxxxx.s1.eu.hivemq.cloud”; // replace with your broker url
^
MqttHive2:11:1: error: stray ‘\200’ in program
MqttHive2:11:1: error: stray ‘\234’ in program
MqttHive2:11:30: error: exponent has no digits
const char* mqtt_server = “xxxxxxxxxxxxxxxxxxxxxx.s1.eu.hivemq.cloud”; // replace with your broker url
^
MqttHive2:11:1: error: stray ‘\342’ in program
const char* mqtt_server = “xxxxxxxxxxxxxxxxxxxxxxx.s1.eu.hivemq.cloud”; // replace with your broker url
^
MqttHive2:11:1: error: stray ‘\200’ in program
MqttHive2:11:1: error: stray ‘\235’ in program
MqttHive2:12:1: error: stray ‘\342’ in program
const char* mqtt_username = “hivexxxxx”;
"

Start by commenting everything and uncomment step by step

Start with the wifi then move on to the MQTT

Which ESP32 are you using ?

The error 342 seem to be because this website has unicode

Give me an email and il send you the .ino

i shared a googleDrive link in my other post for the ino file