Arduino IDE for ESP8266教程（三）HTTP客户端

#include <ESP8266WiFi.h>#include <ESP8266HTTPClient.h>#define UKey "" // Yeelink提供的U-ApiKeyString ssid = ""; // 需要连接的wifi热点名称String password = ""; // 需要连接的wifi热点密码/* 上传数据到服务器。 * device为设备号，sensor为传感器号，data为上传数据点的值 * 这里默认上传到最新的数据点上，需要上传到特定点上就得在post内容中单独加入时间戳 ?*/void uploadYeelinkData(String device, String sensor, String data) { ?HTTPClient http; ?const String apiAddress = "/v1.1/device/" + device + "/sensor/" + sensor + "/datapoints"; ?http.begin("api.yeelink.net", 80, apiAddress); ?http.addHeader("U-ApiKey",UKey, true); ?int httpCode = ?http.POST("{\"value\":" + data + "}"); ?Serial.print("code:"); ?Serial.println(httpCode); ?if(httpCode == 200) { // 访问成功，取得返回参数 ?????String payload = http.getString(); ?????Serial.println(payload); ?} else { // 访问不成功，打印原因 ????String payload = http.getString(); ????Serial.print("context:"); ????Serial.println(payload); ?}}/* 从服务器取得数据 * device为设备号，sensor为传感器号 */void readYeelinkData(String device, String sensor) { ?HTTPClient http; ?// 这里使用的api是v1.0的，v1.1的api需要提供U-ApiKey ?const String apiAddress = "/v1.0/device/" + device + "/sensor/" + sensor + "/datapoints"; ?http.begin("api.yeelink.net", 80, apiAddress); ?int httpCode = ?http.GET(); // 使用GET形式来取得数据 ?Serial.print("code:"); ?Serial.println(httpCode); ?if(httpCode == 200) { // 访问成功，取得返回参数 ?????String payload = http.getString(); ?????Serial.println(payload); ?} else { // 访问不成功，打印原因 ????String payload = http.getString(); ????Serial.print("context:"); ????Serial.println(payload); ?}}void setup() { ?Serial.begin ( 115200 ); ?int connectCount = 0; ?WiFi.begin ( ssid.c_str(), password.c_str() ); ?while ( WiFi.status() != WL_CONNECTED ) { ???delay ( 1000 ); ???Serial.print ( "." ); ???if(connectCount > 30) { ?????Serial.println( "Connect fail!" ); ?????break; ???} ???connectCount += 1; ?} ?if(WiFi.status() == WL_CONNECTED) { ???Serial.println ( "" ); ???Serial.print ( "Connected to " ); ???Serial.println ( ssid ); ???Serial.print ( "IP address: " ); ???Serial.println ( WiFi.localIP() ); ???connectCount = 0; ?} ?//readYeelinkData("8938", "28887"); // 读取数据点测试 ?uploadYeelinkData("8938", "28887", "1"); // 写入数据点测试} void loop() { ?}