想用arduino ide解析androidstudio发送的json数据，但是一直显示"parseObject() failed"

Question

下面是androidstudio发送json数据的代码，应该是发送成功了，但是arduino显示"parseObject() failed" public void openLed(){     String url = "http://api.heclouds.com/cmds?device_id=xxxxxxxx";     RequestParams params = new RequestParams(url);     params.addHeader("api-key","xxxxxxxxx");     params.addHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");     params.addHeader("accept", "*/*");     params.addHeader("Connection", "Keep-Alive");     params.addHeader("Charset", "UTF-8");     params.addBodyParameter("code","led-0");     x.http().post(params, new Callback.CommonCallback<String>() {         @Override         public void onSuccess(String result) {             Log.e("bean",result);         }         @Override         public void onError(Throwable ex, boolean isOnCallback) {             Log.e("bean","error");         }         @Override         public void onCancelled(CancelledException cex) {         }         @Override         public void onFinished() {             Log.e("bean","finish");         }     }); } 下面是arduinoIDE解析json数据代码： void parseOneNetMqttResponse(char* payload){    Serial.println("start parseOneNetMqttResponse");       StaticJsonBuffer<300> jsonBuffer;        // StaticJsonBuffer 在栈区分配内存   它也可以被 DynamicJsonBuffer（内存在堆区分配） 代替         // DynamicJsonBuffer  jsonBuffer;       JsonObject& root = jsonBuffer.parseObject(payload);       // Test if parsing succeeds.        if (!root.success())        {       Serial.println("parseObject() failed");       return ;   }         String code = root["code"];            if(strcmp(code.c_str(),"code=led-1")==0)            {             i=1;digitalWrite(D7, LOW);        }             else if(strcmp(code.c_str(),"code=led-0")==1)             {            i=0;digitalWrite(D7, HIGH);        }         }