JSON 在 Arduino 和 ESP8266 中解析失败

Question

我必须从 [this REST API][1] 中提取 Ajax 响应。请为此提供一个代码片段，以便我可以继续我被困在这里。

我需要从 http://tutor4study.com/forms/ajaxDeviceValue 读取 JSON 数据，然后我必须解析它。

enter code here
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ArduinoJson.h>

const char* ssid = "ssid";
const char* password = "password";

const char* host = "tutor4study.com";
const int httpsPort = 80;
 WiFiClient client;
 WiFiClient readClient;
 String sensorValue1 = "5555";
 String sensorValue2 = "9999";
 String readUrl = "";
 char readLine;
 String readResponse ="";
 String readJsonResponse ="";



void setup() {
               Serial.begin(115200);
               Serial.println();
               Serial.print("connecting to ");
               Serial.println(ssid);
               WiFi.begin(ssid, password);
               while (WiFi.status() != WL_CONNECTED) {
                                                        delay(500);
                                                        Serial.print(".");
                                                      }
               Serial.println("");
               Serial.println("WiFi connected");
               Serial.println("IP address: ");
               Serial.println(WiFi.localIP());
               Serial.print("connecting to ");

                pinMode(4, OUTPUT);
                pinMode(5, OUTPUT);
               // yield();

            }

StaticJsonBuffer<200> jsonBuffer;



void readConnect(){
                   if(!readClient.connect(host,httpsPort)){
                                                            Serial.println("connection failed for readCLient");
                                                            ESP.reset();
                                                            return;
                    }
                   readUrl = "/forms/ajaxDeviceValue";
                    Serial.print("requesting URL: ");
                    Serial.println(readUrl);
                    readClient.print(String("GET ")+readUrl+" HTTP/1.1\r\n"+
                    "Host: "+host+"\r\n"+
                    "Connection: close\r\n\r\n");
                    while(readClient.connected()){
                                                  readLine = readClient.read();
                                                  Serial.print(readLine);
                                                  readResponse += readLine;                 
                      }

                      JsonObject& root = jsonBuffer.parseObject(readResponse);

    if (!root.success()) {
    Serial.println("parseObject() failed");
    return;
    }

  }

void loop() {
              readConnect();

            }

以上是我的代码。请查看代码，让我知道如何读取 JSON 对 url /ajaxDeviceValue 的响应并将其解析为字符串。

Answer 1

我在阅读 WiFiClient 的大量尝试和尝试后找到了解决方案。它给了我很少的垃圾价值，Json response.Because 的垃圾价值 ArduinoJson 库是无法解析它。我使用 HttpClient 读取响应，它返回清晰的 Json，ArduinoJson 能够解析，现在代码工作正常。

JSON 在 Arduino 和 ESP8266 中解析失败

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