问为什么来自ESP32的这个POST请求控制KASA智能插头不能工作？

EN

URL: https://use1-wap.tplinkcloud.com/?token=fb2f7209-ATebDhHDOxB2wWc6wslPewO&appName=Kasa_Android&termID=1263f577-4387-4d3e-be79-705445d33bb08&appVer=1.4.4.607&ospf=Android+6.0.1&netType=wifi&locale=en_US

{
 "method":"passthrough",
 "params":{
 "deviceId":"80068FEB5A735A5BB187B4EC309EF1BE1D6D8997",
 "requestData":"{\"system\":{\"set_relay_state\":{\"state\":1}}}"
 }
}

/*
  Rui Santos
  Complete project details at Complete project details at https://RandomNerdTutorials.com/esp32-http-get-post-arduino/

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/

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

#include <WiFiClientSecure.h>


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

//Your Domain name with URL path or IP address with path
const char* serverName = "https://use1-wap.tplinkcloud.com/?token=fb2f7209-ATebDhHDOxB2wWc6wslPewO&appName=Kasa_Android&termID=1263f577-4387-4d3e-be79-705445d33bb08&appVer=1.4.4.607&ospf=Android+6.0.1&netType=wifi&locale=en_US HTTP/1.1";
const int port = 443;

// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastTime = 0;
// Timer set to 10 minutes (600000)
//unsigned long timerDelay = 600000;
// Set timer to 5 seconds (5000)
unsigned long timerDelay = 5000;

void setup() {
  Serial.begin(115200);

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
 
  Serial.println("Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.");
}

void loop() {
  //Send an HTTP POST request every 10 minutes
  if ((millis() - lastTime) > timerDelay) {
    //Check WiFi connection status
    if(WiFi.status()== WL_CONNECTED){
      WiFiClientSecure *client = new WiFiClientSecure;

      if (client) {
        Serial.println("Client Created!");
        //client -> setCACert(rootCACertificate);
        
        {
          HTTPClient http;
        
          // Your Domain name with URL path or IP address with path
          http.begin(*client, serverName);
          
          // If you need an HTTP request with a content type: application/json, use the following:
          http.addHeader("Content-Type", "application/json");
          //int httpResponseCode = http.POST("{\"api_key\":\"tPmAT5Ab3j7F9\",\"sensor\":\"BME280\",\"value1\":\"24.25\",\"value2\":\"49.54\",\"value3\":\"1005.14\"}");
          int httpResponseCode = http.POST("{\"method\":\"passthrough\", \"params\": {\"deviceId\": \"80068FEB5A735A5BB187B4EC309EF1BE1D6D8997\", \"requestData\": \"{\"system\":{\"set_relay_state\":{\"state\":0}}}\" }}");
         
          Serial.print("HTTP Response code: ");
          Serial.println(httpResponseCode);

          String payload = http.getString();
          Serial.print("HTTP String: ");
          Serial.println(payload);
            
          // Free resources
          http.end();
        }
        
        delete client;
      } else {
        Serial.println("Unable to create client");
      }
      
    } else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
}

Connected to WiFi network with IP Address: 192.168.X.XXX
Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.
Client Created!
HTTP Response code: 200
HTTP String: {"error_code":-10100,"msg":"JSON format error"}