GreaT!
I’m glad the issue is solved.
Regards,
Sara

/*
Rui Santos & Sara Santos – Random Nerd Tutorials
Complete project details at https://RandomNerdTutorials.com/esp32-mqtt-publish-ds18b20-temperature-arduino/
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*/
#include <WiFi.h>
extern “C” {
#include “freertos/FreeRTOS.h”
#include “freertos/timers.h”
}

#include <OneWire.h>
#include <DallasTemperature.h>
#include <AsyncMqttClient.h>
#define WIFI_SSID “D Schus”
#define WIFI_PASSWORD “2432Line34”

// Raspberry Pi Mosquitto MQTT Broker
#define MQTT_HOST IPAddress(192, 168, 0, 192)
// For a cloud MQTT broker, type the domain name
//#define MQTT_HOST “example.com”
#define MQTT_PORT 1883

// Temperature MQTT Topic
#define MQTT_PUB_1 “esp32/ds18b20/temperature”
#define MQTT_PUB_2 “esp32/ds18b20/temperature1”
#define MQTT_PUB_3 “esp32/ds18b20/temperature2”

// GPIO where the DS18B20 is connected to
#define oneWireBus 4
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);
// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);
// Temperature value
float temp;
float temp1;
float temp2;

DeviceAddress sensor1 = { 0x28, 0x4C, 0x45, 0x96, 0xF0, 0x1, 0x3C, 0x91 };
DeviceAddress sensor2 = { 0x28, 0x19, 0x60, 0x96, 0xF0, 0x1, 0x3C, 0x7E };
DeviceAddress sensor3= { 0x28, 0x9F, 0x41, 0x96, 0xF0, 0x1, 0x3C, 0x13 };

AsyncMqttClient mqttClient;
TimerHandle_t mqttReconnectTimer;
TimerHandle_t wifiReconnectTimer;

unsigned long previousMillis = 0; // Stores last time temperature was published
const long interval = 10000; // Interval at which to publish sensor readings

void connectToWifi() {
Serial.println(“Connecting to Wi-Fi…”);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
}

void connectToMqtt() {
Serial.println(“Connecting to MQTT…”);
mqttClient.connect();
}

void WiFiEvent(WiFiEvent_t event) {
Serial.printf(“[WiFi-event] event: %d\n”, event);
switch(event) {
case ARDUINO_EVENT_WIFI_STA_GOT_IP:
Serial.println(“WiFi connected”);
Serial.println(“IP address: “);
Serial.println(WiFi.localIP());
connectToMqtt();
break;
case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
Serial.println(“WiFi lost connection”);
xTimerStop(mqttReconnectTimer, 0); // ensure we don’t reconnect to MQTT while reconnecting to Wi-Fi
xTimerStart(wifiReconnectTimer, 0);
break;
}
}

void onMqttConnect(bool sessionPresent) {
Serial.println(“Connected to MQTT.”);
Serial.print(“Session present: “);
Serial.println(sessionPresent);
}

void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {
Serial.println(“Disconnected from MQTT.”);
if (WiFi.isConnected()) {
xTimerStart(mqttReconnectTimer, 0);
}
}

/void onMqttSubscribe(uint16_t packetId, uint8_t qos) {
Serial.println(“Subscribe acknowledged.”);
Serial.print(” packetId: “);
Serial.println(packetId);
Serial.print(” qos: “);
Serial.println(qos);
}
void onMqttUnsubscribe(uint16_t packetId) {
Serial.println(“Unsubscribe acknowledged.”);
Serial.print(” packetId: “);
Serial.println(packetId);
}/

void onMqttPublish(uint16_t packetId) {
Serial.println(“Publish acknowledged.”);
Serial.print(” packetId: “);
Serial.println(packetId);
}

void setup() {
// Start the DS18B20 sensor
sensors.begin();

Serial.begin(115200);
Serial.println();
Serial.println();

mqttReconnectTimer = xTimerCreate(“mqttTimer”, pdMS_TO_TICKS(2000), pdFALSE, (void)0, reinterpret_cast(connectToMqtt));
wifiReconnectTimer = xTimerCreate(“wifiTimer”, pdMS_TO_TICKS(2000), pdFALSE, (void)0, reinterpret_cast(connectToWifi));

WiFi.onEvent(WiFiEvent);

mqttClient.onConnect(onMqttConnect);
mqttClient.onDisconnect(onMqttDisconnect);
//mqttClient.onSubscribe(onMqttSubscribe);
//mqttClient.onUnsubscribe(onMqttUnsubscribe);
mqttClient.onPublish(onMqttPublish);
mqttClient.setServer(MQTT_HOST, MQTT_PORT);
// If your broker requires authentication (username and password), set them below
//mqttClient.setCredentials(“dani”, “dani”);
connectToWifi();
}

void loop() {
unsigned long currentMillis = millis();
// Every X number of seconds (interval = 10 seconds)
// it publishes a new MQTT message
if (currentMillis – previousMillis >= interval) {
// Save the last time a new reading was published
previousMillis = currentMillis;
// New temperature readings
sensors.requestTemperatures();
// Temperature in Celsius degrees
temp = sensors.getTempC(sensor1);
temp1 = sensors.getTempC(sensor2);
temp2 = sensors.getTempC(sensor3);
// Temperature in Fahrenheit degrees
//temp = sensors.getTempFByIndex(0);

// Publish an MQTT message on topic esp32/ds18b20/temperature
uint16_t packetIdPub1 = mqttClient.publish(MQTT_PUB_1, 1, true, String(temp).c_str());

Serial.printf("Publishing on topic %s at QoS 1, packetId: ", MQTT_PUB_1);
Serial.println(packetIdPub1);
Serial.printf("Message: %.2f /n", sensors.getTempC(sensor1));


uint16_t packetIdPub2 = mqttClient.publish(MQTT_PUB_2, 1, true, String(temp1).c_str());

Serial.printf("Publishing on topic %s at QoS 1, packetId: ", MQTT_PUB_2);
Serial.println(packetIdPub2);
Serial.printf("Message: %.2f /n", sensors.getTempC(sensor2));


uint16_t packetIdPub3 = mqttClient.publish(MQTT_PUB_3, 1, true, String(temp2).c_str());

Serial.printf("Publishing on topic %s at QoS 1, packetId: ", MQTT_PUB_3);
Serial.println(packetIdPub3);
Serial.printf("Message: %.2f /n", sensors.getTempC(sensor3));


}
}

/*
Rui Santos & Sara Santos – Random Nerd Tutorials
Complete project details at https://RandomNerdTutorials.com/esp32-mqtt-publish-ds18b20-temperature-arduino/
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*/
#include <WiFi.h>
extern “C” {
#include “freertos/FreeRTOS.h”
#include “freertos/timers.h”
}

#include <OneWire.h>
#include <DallasTemperature.h>
#include <AsyncMqttClient.h>
#define WIFI_SSID “D Schus”
#define WIFI_PASSWORD “2432Line34”

// Raspberry Pi Mosquitto MQTT Broker
#define MQTT_HOST IPAddress(192, 168, 0, 192)
// For a cloud MQTT broker, type the domain name
//#define MQTT_HOST “example.com”
#define MQTT_PORT 1883

// Temperature MQTT Topic
#define MQTT_PUB_TEMP “esp32/ds18b20/temperature”
#define MQTT_PUB_TEMP1 “esp32/ds18b20/temperature1”
#define MQTT_PUB_TEMP2 “esp32/ds18b20/temperature2”

// GPIO where the DS18B20 is connected to
#define oneWireBus 4
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);
// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);
// Temperature value
float temp;

DeviceAddress sensor1 = { 0x28, 0x4C, 0x45, 0x96, 0xF0, 0x1, 0x3C, 0x91 };
DeviceAddress sensor2 = { 0x28, 0x19, 0x60, 0x96, 0xF0, 0x1, 0x3C, 0x7E };
DeviceAddress sensor3= { 0x28, 0x9F, 0x41, 0x96, 0xF0, 0x1, 0x3C, 0x13 };

AsyncMqttClient mqttClient;
TimerHandle_t mqttReconnectTimer;
TimerHandle_t wifiReconnectTimer;

unsigned long previousMillis = 0; // Stores last time temperature was published
const long interval = 10000; // Interval at which to publish sensor readings

void connectToWifi() {
Serial.println(“Connecting to Wi-Fi…”);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
}

void connectToMqtt() {
Serial.println(“Connecting to MQTT…”);
mqttClient.connect();
}

void WiFiEvent(WiFiEvent_t event) {
Serial.printf(“[WiFi-event] event: %d\n”, event);
switch(event) {
case ARDUINO_EVENT_WIFI_STA_GOT_IP:
Serial.println(“WiFi connected”);
Serial.println(“IP address: “);
Serial.println(WiFi.localIP());
connectToMqtt();
break;
case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
Serial.println(“WiFi lost connection”);
xTimerStop(mqttReconnectTimer, 0); // ensure we don’t reconnect to MQTT while reconnecting to Wi-Fi
xTimerStart(wifiReconnectTimer, 0);
break;
}
}

void onMqttConnect(bool sessionPresent) {
Serial.println(“Connected to MQTT.”);
Serial.print(“Session present: “);
Serial.println(sessionPresent);
}

void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {
Serial.println(“Disconnected from MQTT.”);
if (WiFi.isConnected()) {
xTimerStart(mqttReconnectTimer, 0);
}
}

/void onMqttSubscribe(uint16_t packetId, uint8_t qos) {
Serial.println(“Subscribe acknowledged.”);
Serial.print(” packetId: “);
Serial.println(packetId);
Serial.print(” qos: “);
Serial.println(qos);
}
void onMqttUnsubscribe(uint16_t packetId) {
Serial.println(“Unsubscribe acknowledged.”);
Serial.print(” packetId: “);
Serial.println(packetId);
}/

void onMqttPublish(uint16_t packetId) {
Serial.println(“Publish acknowledged.”);
Serial.print(” packetId: “);
Serial.println(packetId);
}

void setup() {
// Start the DS18B20 sensor
sensors.begin();

Serial.begin(115200);
Serial.println();
Serial.println();

mqttReconnectTimer = xTimerCreate(“mqttTimer”, pdMS_TO_TICKS(2000), pdFALSE, (void)0, reinterpret_cast(connectToMqtt));
wifiReconnectTimer = xTimerCreate(“wifiTimer”, pdMS_TO_TICKS(2000), pdFALSE, (void)0, reinterpret_cast(connectToWifi));

WiFi.onEvent(WiFiEvent);

mqttClient.onConnect(onMqttConnect);
mqttClient.onDisconnect(onMqttDisconnect);
//mqttClient.onSubscribe(onMqttSubscribe);
//mqttClient.onUnsubscribe(onMqttUnsubscribe);
mqttClient.onPublish(onMqttPublish);
mqttClient.setServer(MQTT_HOST, MQTT_PORT);
// If your broker requires authentication (username and password), set them below
//mqttClient.setCredentials(“dani”, “dani”);
connectToWifi();
}

void loop() {
unsigned long currentMillis = millis();
// Every X number of seconds (interval = 10 seconds)
// it publishes a new MQTT message
if (currentMillis – previousMillis >= interval) {
// Save the last time a new reading was published
previousMillis = currentMillis;
// New temperature readings
sensors.requestTemperatures();
// Temperature in Celsius degrees
temp = sensors.getTempCByIndex(0);
// Temperature in Fahrenheit degrees
//temp = sensors.getTempFByIndex(0);

// Publish an MQTT message on topic esp32/ds18b20/temperature
uint16_t packetIdPub1 = mqttClient.publish(MQTT_PUB_TEMP, 1, true, String(temp).c_str());

Serial.printf("Publishing on topic %s at QoS 0, packetId: ", MQTT_PUB_TEMP);
Serial.println(packetIdPub1);
Serial.printf("Message: %.2f /n", sensors.getTempC(sensor1));


uint16_t packetIdPub2 = mqttClient.publish(MQTT_PUB_TEMP1, 1, true, String(temp).c_str());

Serial.printf("Publishing on topic %s at QoS 0, packetId: ", MQTT_PUB_TEMP1);
Serial.println(packetIdPub2);
Serial.printf("Message: %.2f /n", sensors.getTempC(sensor2));


uint16_t packetIdPub3 = mqttClient.publish(MQTT_PUB_TEMP2, 1, true, String(temp).c_str());

Serial.printf("Publishing on topic %s at QoS 0, packetId: ", MQTT_PUB_TEMP2);
Serial.println(packetIdPub3);
Serial.printf("Message: %.2f /n", sensors.getTempC(sensor3));


}
}

All node-red displays will only show the esp32/ds18b20/temperature information, though on node red they are specified esp32/ds18b20/temperature, esp32/ds18b20/temperature1, esp32/ds18b20/temperature2.

Any advice?

So current issue relating to project:19:20:53.658 ->
19:20:53.658 -> Connecting to Wi-Fi…
19:20:53.658 -> [WiFi-event] event: 101
19:20:53.734 -> [WiFi-event] event: 110
19:20:55.909 -> [WiFi-event] event: 113
19:20:55.909 -> WiFi lost connection
19:20:56.036 -> [WiFi-event] event: 112
19:20:57.066 -> [WiFi-event] event: 115
19:20:57.066 -> WiFi connected
19:20:57.066 -> IP address:
19:20:57.066 -> 192.168.0.187
19:20:57.066 -> Connecting to MQTT…
19:20:57.066 ->
19:20:57.066 -> assert failed: tcp_alloc /IDF/components/lwip/lwip/src/core/tcp.c:1854 (Required to lock TCPIP core functionality!)
19:20:57.066 ->
19:20:57.066 ->
19:20:57.066 -> Backtrace: 0x4008bad4:0x3ffb56d0 0x4008ba99:0x3ffb56f0 0x40092055:0x3ffb5710 0x400f09d3:0x3ffb5850 0x400f0b45:0x3ffb5870 0x400d8542:0x3ffb5890 0x400d5aa9:0x3ffb58e0 0x400d2807:0x3ffb5920 0x400d285a:0x3ffb5940 0x400d3ee3:0x3ffb5980 0x400d3f41:0x3ffb5a80 0x4008cd8d:0x3ffb5aa0
19:20:57.099 ->
19:20:57.099 ->
19:20:57.099 ->
19:20:57.099 ->
19:20:57.099 -> ELF file SHA256: 7a0d2f56e
19:20:57.099 ->
19:20:57.374 -> Rebooting…

Hi.
The link you were using was broken. This is the correct one: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
However, you no longer need to add the URL. Check this tutorial: https://randomnerdtutorials.com/installing-esp32-arduino-ide-2-0/
Regards,
Sara

connecting to wifi…
[wifi-event] event: 101
[wifi-event] event: 110
[wifi-event] event: 113
wifi connection lost
[wifi-event] event: 112
[wifi-event] event: 115
wifi connected
IP address:
xxx.xxx.x.xxx
connecting to mqtt

assert failed: tcp_alloc /IDF/components/lwip/lwip/src/core/tcp.c:1854 (required to lock tcpip core functionality!)

backtrace: then a bunch of number letter combos

and then repeats

Apologies again

In file included from C:\Users\dschu\AppData\Local\Arduino15\packages\esp32\tools\esp32-libs\3.3.7/include/bt/include/esp32/include/esp_bt.h:16,
from C:\Users\dschu\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.7\cores\esp32\esp32-hal-bt.c:30:
C:/Users/dschu/AppData/Local/Arduino15/packages/esp32/tools/esp32-libs/3.3.7/include/controller/esp32/esp_bredr_cfg.h:18:9: note: ‘#pragma message: BT: forcing BR/EDR max sync conn eff to 1 (Bluedroid HFP requires SCO/eSCO)’
18 | #pragma message (“BT: forcing BR/EDR max sync conn eff to 1 (Bluedroid HFP requires SCO/eSCO)”)
| ^~~~~~~
In file included from C:\Users\dschu\AppData\Local\Arduino15\packages\esp32\tools\esp32-libs\3.3.7/include/bt/include/esp32/include/esp_bt.h:16,
from C:\Users\dschu\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.7\cores\esp32\esp32-hal-misc.c:29:
C:/Users/dschu/AppData/Local/Arduino15/packages/esp32/tools/esp32-libs/3.3.7/include/controller/esp32/esp_bredr_cfg.h:18:9: note: ‘#pragma message: BT: forcing BR/EDR max sync conn eff to 1 (Bluedroid HFP requires SCO/eSCO)’
18 | #pragma message (“BT: forcing BR/EDR max sync conn eff to 1 (Bluedroid HFP requires SCO/eSCO)”)
| ^~~~~~~
Sketch uses 928336 bytes (70%) of program storage space. Maximum is 1310720 bytes.
Global variables use 47080 bytes (14%) of dynamic memory, leaving 280600 bytes for local variables. Maximum is 327680 bytes.

A fatal error occurred: Could not open COM3, the port is busy or doesn’t exist.
(could not open port ‘COM3’: OSError(22, ‘A device which does not exist was specified.’, None, 433))

esptool v5.1.0
Serial port COM3:
Failed uploading: uploading error: exit status 2

Hi.
Do you have anti-virus installed?
It may be preventing the Arduino IDE to download the boards and necessary packages to install them.
You may need to temporarily disable your antivirus.
Regards,
Sara