我正在尝试制作一个具有主/从架构的项目。这是我的主节点的代码。
我不知道我做错了什么，但它无法连接到经纪人。上次我用 ESP8266 尝试过，它可以工作。因为我需要蓝牙连接，所以我要更换主板。我正在使用 HiveMQ 代理。
#include "DHT.h"
#include <BluetoothSerial.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#define DHTPIN 4
#define DHTTYPE DHT11
// WIFI
const char *ssid = "xxx";
const char *password = "xxx";
// MQTT
const char *MQTT_SERVER = "x.s2.eu.hivemq.cloud";
const int MQTT_PORT = 8883; // Use an integer for MQTT port
const char *MQTT_USERNAME = "x";
const char *MQTT_PASSWORD = "x";
const char *MQTT_CLIENT_ID = "esp32_master";
DHT dht(DHTPIN, DHTTYPE);
BluetoothSerial SerialBT;
WiFiClientSecure espClient;
PubSubClient client(espClient);
char sensorData[50];
/****** root certificate *********/
static const char *root_ca PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
)EOF";
void setup() {
Serial.begin(9600);
SerialBT.begin("ESP32_Master");
Serial.println(F("Master has started!"));
dht.begin();
if (!connectToWiFi()) {
// If WiFi connection fails, you might want to handle it accordingly.
// For simplicity, I'm setting up MQTT only when WiFi is successfully connected.
espClient.setCACert(root_ca);
client.setServer(MQTT_SERVER, MQTT_PORT);
}
}
void loop() {
if (!client.connected() && WiFi.status() == WL_CONNECTED) reconnect(); // check if client is connected
handleData();
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
int h = dht.readHumidity();
int t = dht.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
String sensorData = "{\"id\":\"0\",\"temperature\":" + String(t) + ",\"humidity\":" + String(h) + "}\n";
Serial.println(sensorData);
// Send sensor data to MQTT
if (client.connected()) {
client.publish("suhu", sensorData.c_str());
Serial.println("Data sent to MQTT broker");
}
// You can use the sensorData array for other purposes beyond printing
// For example, you might want to store it in a database, etc.
delay(10000); // Adjust the delay according to your requirements
}
void handleData() {
if (SerialBT.available()) {
// Read data from slave via Bluetooth
String data = SerialBT.readStringUntil('\n');
// Send data to MQTT
if (client.connected()) {
client.publish("suhu", data.c_str());
Serial.println("Data sent to MQTT broker");
}
}
}
bool connectToWiFi() {
Serial.println("Connecting to WiFi");
WiFi.begin(ssid, password);
int attempts = 0;
while (WiFi.status() != WL_CONNECTED && attempts < 10) {
delay(1000);
Serial.println(F("Connecting to WiFi..."));
attempts++;
}
if (WiFi.status() == WL_CONNECTED) {
Serial.println("Connected to WiFi");
return true;
} else {
Serial.println("Failed to connect to WiFi");
return false;
}
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
String clientId = "ESP32_Master";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str(), MQTT_USERNAME, MQTT_PASSWORD)) {
Serial.println("connected");
// client.subscribe("led_state"); // 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);
}
}
}
如果有人有同样的问题请告诉我。
Connecting to WiFi...
Connecting to WiFi...
Connecting to WiFi...
Connected to WiFi
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds
Attempting MQTT connection...failed, rc=-2 try again in 5 seconds
预计董事会已连接到经纪商。
这完全是我的错。
if (!connectToWiFi()) {
// If WiFi connection fails, you might want to handle it accordingly.
// For simplicity, I'm setting up MQTT only when WiFi is successfully connected.
espClient.setCACert(root_ca);
client.setServer(MQTT_SERVER, MQTT_PORT);
}
if 条件实际上设置为 false，它应该为 true。因此将
if (!connectToWiFi())if (connectToWiFi())我尝试重做我的代码，一一添加功能以测试它是否有效然后继续。现在我在master上添加蓝牙，这样它就可以从slave接收数据，我不知道是否可以通过蓝牙从2个ESP32接收数据。