WiFi 无线局域网

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

const char* ssid = "Home_5G";
const char* pass = "********";

WiFiClient net;
PubSubClient mqtt(net);

void setup(){
  WiFi.begin(ssid, pass);
  while(WiFi.status() != WL_CONNECTED){ delay(500); }
  mqtt.setServer("iot.example.com", 1883);
  mqtt.connect("dev001", "user", "pass");
  mqtt.publish("dev/001/temp", "26.5");
}
void loop(){
  if(!mqtt.connected()) mqtt.connect("dev001");
  mqtt.loop();          // 保活+收消息
}