求助：基于SIM800L与Arduino实现指定HTTP POST请求

我已通过Python成功实现向指定URL发送HTTP POST请求，代码如下：

requests.post(url="https://9336-154-239-164-63.ngrok-free.app/id=tiva1&lat=30.282092&lon=31.748090&timestamp=2&hdop=3&altitude=44&speed=5");

现希望使用Arduino搭配SIM800L模块实现相同功能，但自行编写的代码无法正常运行，代码如下：

#include <SoftwareSerial.h>

// SoftwareSerial object to communicate with SIM800L
SoftwareSerial sim800l(10, 11); // RX, TX

void setup() {
  Serial.begin(9600);
  sim800l.begin(9600);

  delay(2000);
 
  sendATCommand("AT"); // Check if the module is responding
  sendATCommand("AT+CPIN?"); // Check SIM card status
  sendATCommand("AT+CGATT?"); // Check if attached to GPRS
  sendATCommand("AT+SAPBR=3,1,\"Contype\",\"GPRS\""); // Set the connection type
  sendATCommand("AT+SAPBR=1,1"); // Enable GPRS
  sendATCommand("AT+HTTPINIT");
   // Initialize HTTP service
}

void loop() {
  
  // Make the HTTP POST request
  String url = "https://9336-154-239-164-63.ngrok-free.app/id=tiva1&lat=30.282092&lon=31.748090&timestamp=2&hdop=3&altitude=44&speed=5";
  sendATCommand("AT+HTTPPARA=\"URL\",\"" + url + "\"");
  sendATCommand("AT+HTTPPARA=\"CONTENT\",\"application/x-www-form-urlencoded\"");
  sendATCommand("AT+HTTPDATA=0,10000"); // Set the data length
  sendATCommand("AT+HTTPACTION=1"); // Start the POST request

  delay(5000); // Wait for the response

  // Read the response
  sendATCommand("AT+HTTPREAD=0,1000");

  // Close the HTTP service
  sendATCommand("AT+HTTPTERM");

  delay(60000); // Wait for 1 minute before making the next request
}


void sendATCommand(String command) {
  sim800l.println(command);
  delay(500);
  while (sim800l.available()) {
    char c = sim800l.read();
    Serial.write(c);
    delay(30); // Delay between characters to allow time for printing
  }
}

恳请协助排查代码问题，实现与Python版本相同的HTTP POST请求功能。

内容的提问来源于stack exchange，提问作者khaled mohamed