什么是ESP8266和ESP32？物联网开发者的必修课与硬核选型指南

       cpp     

#include<WiFi.h>// ESP32 使用 WiFi.h，ESP8266 使用 ESP8266WiFi.h#include<HTTPClient.h>constchar* ssid     = "Geek_Studio_2.4G"; constchar* password = "YourSecurePassword";  voidsetup(){   Serial.begin(115200);   delay(1000);      Serial.print("Connecting to Wi-Fi: ");   Serial.println(ssid);      WiFi.mode(WIFI_STA);   WiFi.begin(ssid, password);      // 等待连接建立while (WiFi.status() != WL_CONNECTED) {     delay(500);     Serial.print(".");   }      Serial.println(" [OK] WiFi Connected Successfully!");   Serial.print("Assigned IP Address: ");   Serial.println(WiFi.localIP()); }  voidloop(){   if (WiFi.status() == WL_CONNECTED) {     HTTPClient http;     http.begin("http://api.sensor.local/v1/report");     http.addHeader("Content-Type", "application/json");          String postData = "{\"device\":\"ESP32-Node\",\"temp\":26.5,\"humidity\":58}";     int httpResponseCode = http.POST(postData);          Serial.print("HTTP Response Code: ");     Serial.println(httpResponseCode);     http.end();   }   delay(10000); // 每 10 秒上报一次 }