通过Arduino将ESP8266接入MQTT服务器

之前已经成功在群晖的NAS上搭建了MQTT，接下来就是将ESP8266接入试试

首先在arduino里安装PubSubClient库和ESP8266库

接下来写代码了

[cpp]

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

const char* ssid = "*****";             //wifi名称
const char* password = "*******";       //wifi密码
const char* mqtt_server = "******";    //服务器地址（可IP或者域名）
const int mqttPort = ****;              //服务器端口
const char* mqttUserName = "***";       //mqtt用户账号
const char* mqttPassword = "***";      //mqtt用户密码
const char* client_id = "esp_8266";     //ID（板子唯一标识）

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {

Serial.begin(115200);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.println("Connecting to WiFi..");
}
Serial.println("Connected to the WiFi network");

client.setServer(mqtt_server, mqttPort);
client.setCallback(callback);

while (!client.connected()) {
Serial.println("Connecting to MQTT...");

if (client.connect(client_id,mqttUserName,mqttPassword)) {
Serial.println("connected");

} else {

Serial.print("failed with state ");
Serial.print(client.state());
delay(2000);

}
}

client.publish("esp/test", "Hello from ESP8266");
client.subscribe("esp/test");

}

void callback(char* topic, byte* payload, unsigned int length)
{
Serial.print("Message arrived in topic: ");
Serial.println(topic);

Serial.print("Message:");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
}

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

[/cpp]

已经成功通信了

接下来就是写个APP了