Arduino ESP32 获取网络数据(HTTP PUT方式)

Posted 2021-11-21 perseverance52

Arduino ESP32 获取网络数据(HTTP PUT方式)

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• 相关篇《Arduino ESP32 获取网络数据(HTTP POST方式)》
• 《Arduino ESP32 获取网络数据(HTTP GET方式)》
• 《Arduino ESP32 获取网络数据(HTTP PATCH方式)》

本实例通过PATCH方式请求获取网络数据，由于好多服务器访问不接受PUT方式，导致无法获取到数据。旨在展示获取网络数据的方法，针对获取具体的数据，需要根据具体的访问链接，选择合适的访问方式。

• 不需要要额外库，全部使用自带固件的库
• 访问对象：http://quan.suning.com/getSysTime.do

实例代码

/**
 * ESP32 HTTP GET方式获取网络数据

 *
 */

#include <Arduino.h>

#include <WiFi.h>
#include <HTTPClient.h>

//填写WIFI入网信息
const char* ssid     = "MERCURY_D268G";     // WIFI账户
const char* password = "pba5ayzk"; // WIFI密码

void setup() {

    Serial.begin(115200);
    Serial.println();

  Serial.print("Attempting to connect to SSID: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);

    for(uint8_t t = 4; t > 0; t--) {
        Serial.printf("[SETUP] WAIT %d...\\n", t);
        Serial.flush();
        delay(1000);
    }

  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    // wait 1 second for re-trying
    delay(1000);
  }
/* 开始访问指定服务器地址，获取数据  */
  Serial.print("Connected to ");
  Serial.println(ssid);
        HTTPClient http;//创建 WiFiClient 实例化对象
        Serial.print("[HTTP] begin...\\n");
        // configure traged server and url
        http.begin("http://quan.suning.com/getSysTime.do"); //HTTP

        Serial.print("[HTTP] PUT...\\n");
        // start connection and send HTTP header
        int httpCode = http.PUT("http://quan.suning.com/getSysTime.do");//PUT请求

        // httpCode will be negative on error
        if(httpCode > 0) {
            // HTTP header has been send and Server response header has been handled
            Serial.printf("[HTTP] GET... code: %d\\n", httpCode);

            // file found at server
            if(httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_FOUND) {
                String payload = http.getString();
                Serial.println(payload);
            }
        } else {
            Serial.printf("[HTTP] GET... failed, error: %s\\n", http.errorToString(httpCode).c_str());
        }

        http.end();
}

void loop() {
    delay(5000);
}

• 串口打印访问网络，返回数据情况

返回的代码是：302

• HTTP_CODE代码

/// HTTP codes see RFC7231
typedef enum {
    HTTP_CODE_CONTINUE = 100,
    HTTP_CODE_SWITCHING_PROTOCOLS = 101,
    HTTP_CODE_PROCESSING = 102,
    HTTP_CODE_OK = 200,
    HTTP_CODE_CREATED = 201,
    HTTP_CODE_ACCEPTED = 202,
    HTTP_CODE_NON_AUTHORITATIVE_INFORMATION = 203,
    HTTP_CODE_NO_CONTENT = 204,
    HTTP_CODE_RESET_CONTENT = 205,
    HTTP_CODE_PARTIAL_CONTENT = 206,
    HTTP_CODE_MULTI_STATUS = 207,
    HTTP_CODE_ALREADY_REPORTED = 208,
    HTTP_CODE_IM_USED = 226,
    HTTP_CODE_MULTIPLE_CHOICES = 300,
    HTTP_CODE_MOVED_PERMANENTLY = 301,
    HTTP_CODE_FOUND = 302,
    HTTP_CODE_SEE_OTHER = 303,
    HTTP_CODE_NOT_MODIFIED = 304,
    HTTP_CODE_USE_PROXY = 305,
    HTTP_CODE_TEMPORARY_REDIRECT = 307,
    HTTP_CODE_PERMANENT_REDIRECT = 308,
    HTTP_CODE_BAD_REQUEST = 400,
    HTTP_CODE_UNAUTHORIZED = 401,
    HTTP_CODE_PAYMENT_REQUIRED = 402,
    HTTP_CODE_FORBIDDEN = 403,
    HTTP_CODE_NOT_FOUND = 404,
    HTTP_CODE_METHOD_NOT_ALLOWED = 405,
    HTTP_CODE_NOT_ACCEPTABLE = 406,
    HTTP_CODE_PROXY_AUTHENTICATION_REQUIRED = 407,
    HTTP_CODE_REQUEST_TIMEOUT = 408,
    HTTP_CODE_CONFLICT = 409,
    HTTP_CODE_GONE = 410,
    HTTP_CODE_LENGTH_REQUIRED = 411,
    HTTP_CODE_PRECONDITION_FAILED = 412,
    HTTP_CODE_PAYLOAD_TOO_LARGE = 413,
    HTTP_CODE_URI_TOO_LONG = 414,
    HTTP_CODE_UNSUPPORTED_MEDIA_TYPE = 415,
    HTTP_CODE_RANGE_NOT_SATISFIABLE = 416,
    HTTP_CODE_EXPECTATION_FAILED = 417,
    HTTP_CODE_MISDIRECTED_REQUEST = 421,
    HTTP_CODE_UNPROCESSABLE_ENTITY = 422,
    HTTP_CODE_LOCKED = 423,
    HTTP_CODE_FAILED_DEPENDENCY = 424,
    HTTP_CODE_UPGRADE_REQUIRED = 426,
    HTTP_CODE_PRECONDITION_REQUIRED = 428,
    HTTP_CODE_TOO_MANY_REQUESTS = 429,
    HTTP_CODE_REQUEST_HEADER_FIELDS_TOO_LARGE = 431,
    HTTP_CODE_INTERNAL_SERVER_ERROR = 500,
    HTTP_CODE_NOT_IMPLEMENTED = 501,
    HTTP_CODE_BAD_GATEWAY = 502,
    HTTP_CODE_SERVICE_UNAVAILABLE = 503,
    HTTP_CODE_GATEWAY_TIMEOUT = 504,
    HTTP_CODE_HTTP_VERSION_NOT_SUPPORTED = 505,
    HTTP_CODE_VARIANT_ALSO_NEGOTIATES = 506,
    HTTP_CODE_INSUFFICIENT_STORAGE = 507,
    HTTP_CODE_LOOP_DETECTED = 508,
    HTTP_CODE_NOT_EXTENDED = 510,
    HTTP_CODE_NETWORK_AUTHENTICATION_REQUIRED = 511
} t_http_codes;