使用ArduinoJson库生成百度天工物接入JSON数据

#include 
int sensorA0=51;
float Temperature=28;
StaticJsonDocument<200> doc;

// Inside the brackets, 200 is the RAM allocated to this document.
  // Don't forget to change this value to match your requirement.
  // Use arduinojson.org/v6/assistant to compute the capacity.

void JSON(){
  
  JsonObject desired = doc.createNestedObject("desired");
  JsonObject reported = doc.createNestedObject("reported");
  reported["D1_Temperature"] = Temperature;
  reported["D1_Humidity"] = sensorA0;
  
}

void setup() {
  // Initialize Serial port
  Serial.begin(9600);
  while (!Serial) continue;
  JSON();
  String data = doc.as();
  const char* data_t = data.c_str();
  
  serializeJsonPretty(doc, Serial);
  // The above line prints:
/*
  {
  "desired": {},
  "reported": {
    "D1_Temperature": 28,
    "D1_Humidity": 51
  }
  */
}
// Start a new line
Serial.println(); 
Serial.println(data_t);
  // The above line prints:
//{"desired":{},"reported":{"D1_Temperature":23,"D1_Humidity":455}}
void loop() {
  // not used in this example
}

百度天工JSON数据格式

串口显示效果

使用ArduinoJson库的串口打印，前面为啥会有一段乱码？？？不知道，但是并不影响数据上传，管他呢 ^ _ ^。有知道的大神麻烦解释一下，谢谢，看着挺别扭的，我这里开发板使用的是小黑板esp8266。