通过ESP01 8266进行MQTT连接

Question

我正在尝试与我的m建立联系通过ESP01 8266连接蚊子服务器。我在电脑上安装了mosquito，然后用Brew启动它。

问题是ESP01没有连接到"localhost:1833";(这应该是我的蚊子地址)。我不知道该怎么做，我错过了什么吗?

这一行可能是问题所在?我没有在NodeRed上设置客户端名称------->如果(mqttClient.connect("ESP8266Client")

ESP草图:

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

const char* ssid         = "WifiNetworkname";
const char* password     = "password";
const char* mqttServer   = "localhost:1833";
const int   mqttPort     = 1883;

#define PUB_GPIO2_STATUS "state"
#define SUB_GPIO2_ACTION "state"
#define GPIO2_LED 2

WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

void loop() {
mqttClient.loop();
}

void initWifiStation() {
WiFi.mode(WIFI_AP_STA);
WiFi.begin(ssid, password);    
Serial.print("nConnecting to WiFi");
while (WiFi.status() != WL_CONNECTED) {
delay(1000);        
Serial.print(".");
}
Serial.println(String("nConnected to the WiFi network (") + ssid + ")" );
}

void initMQTTClient() {
// Connecting to MQTT server
mqttClient.setServer(mqttServer, mqttPort);
while (!mqttClient.connected()) {
Serial.println(String("Connecting to MQTT (") + mqttServer + ")...");
if (mqttClient.connect("ESP8266Client")) {
Serial.println("MQTT client connected");  
} else {
Serial.print("nFailed with state ");
Serial.println(mqttClient.state());
if (WiFi.status() != WL_CONNECTED) {
initWifiStation();
}
delay(2000);
}
}

// Declare Pub/Sub topics
mqttClient.publish(PUB_GPIO2_STATUS, "Hello");
mqttClient.subscribe(SUB_GPIO2_ACTION);
}

void setup() {
Serial.begin(115200);
// GPIO2 is set OUTPUT
pinMode(GPIO2_LED, OUTPUT);
initWifiStation();
initMQTTClient();
}

Answer 1

Localhost在您的ESP代码是ESP本身。您正在尝试从ESP连接到ESP。

Localhost总是指"这台计算机"，就像IP地址127.0.0.1一样。

"这computer"从ESP上的代码中看到的是ESP本身，而不是运行MQTT服务器的计算机。

假设语法正确:在const char* mqttServer = "localhost:1833";行中，您需要输入运行MQTT服务器的计算机的IP地址(或名称)，而不是localhost。我不知道你是否也需要更改端口。