Save data with the ESP8266 WIFI module on an external server

Hello everyone. I'm trying to send data from ESP01 WIFI module using Serial Port and Method POST

HARDWARE:
ESP8266 WIFI MODULE ESP01
ESP01 ADAPTER
SOFTWARE
Arduino Uno
STEPS THAT I'M FOLLOWING:
1.- First I need to send data through the Serial port from Arduino Uno to the esp8266 wifi module
2.- This module receives the data.
3.- It's connects to the WIFI.
4.- Sends the data with the METHOD POST to an external server (REST API)
I am new to Arduino. I appreciate your time and help.

This is my code:

#include <SoftwareSerial.h>
SoftwareSerial wifimodule(10, 11); /* RX, TX */
String ssid = "name";
String password = "pass";

String data; //data for the POST request
String server = "http://192.168.0.4:8080/api/v1"; // post route
String uri = "/registrar"; //server side script to call

//reset the esp8266 module
void reset() {
  wifimodule.println("AT+RST");
  delay(3000);
  if(wifimodule.find("OK")){
    Serial.println("Module Reset");
  }    
}

//connect to your wifi network
void connectWifi() {
  String cmd = "AT+CWJAP=\"" + ssid + "\",\"" + password + "\"";
  wifimodule.println(cmd);
  delay(4000);

  if (wifimodule.find("OK")) {
    Serial.println("Connected!");
  } else {
    connectWifi();
    Serial.println("Cannot connect to wifi");
  }
}

void setup() {
  Serial.begin(9600); //start regular serial for PC -> Arduino comms
  wifimodule.begin(115200); //start SoftSerial for ESP comms
  reset(); //call the ESP reset function
  connectWifi(); //call the ESP connection function
  delay(2000);
  Serial.println("begin with configuration...");
}

void loop() {
  Serial.println("begin...");
  savedata();
  delay(2000);
  Serial.println("end...");  
}

void savedata() {
  String ph = "2.5";
  String uv = "200";
  String co2 = "240";
  data = "{\"ph\":\"" + ph + "\",\"uv\":\"" + uv + "\",\"co2\":\"" + co2 + "\"}";
  httppost();
  delay(5000);
}

void httppost() {
  wifimodule.println("AT+CIPSTART=\"TCP\",\"" + server + "\",80"); //start a TCP connection.
  if (wifimodule.find("OK")) {
    Serial.println("TCP connection ready");
  }
  delay(1000);

  String postRequest = String("POST ");
  postRequest = postRequest + uri + " HTTP/1.1\r\n" +
                "Host: " + server + "\r\n" +
                "Accept: *" + "/" + "*\r\n" +
                "Content-Length: " + data.length() + "\r\n" +
                "Content-Type: application/json\r\n" +
                "\r\n" + data;

  Serial.println("Post Request text: "); //see what the fully built POST request looks like
  Serial.println(postRequest);

  String sendCmd = "AT+CIPSEND="; //determine the number of caracters to be sent.
  wifimodule.print(sendCmd);
  wifimodule.println(postRequest.length());
  delay(500);

  if (wifimodule.find(">")) {
    Serial.println("Sending..");
    wifimodule.print(postRequest);

    Serial.println("Data to send: ");
    Serial.println(data);
    Serial.print("Data length: ");
    Serial.println(data.length());
    Serial.print("Request length: ");
    Serial.println(postRequest.length());
    Serial.println("Request Sent:");
    Serial.println(postRequest);

    if ( wifimodule.find("SEND OK")) {
      Serial.println("Packet sent");
      while (wifimodule.available()) {
        String tmpResp = wifimodule.readString();
        Serial.println(tmpResp);
      }
      // close the connection
      wifimodule.println("AT+CIPCLOSE");
    }
  }
}

The program compiles normally and the serial monitor is only blank but when executing the AT commands they are not executed.
I don't know what to do. Please, help me :disappointed_relieved:
Thanks in advance for your help.

this is not a code for the esp8266. this is a code for Arduino with esp01 wired to pins 10 and 11

Thanks for your answer @Juraj . I'm noob in Arduino, Do you have any example with the implementation? What else I need to do? I'll be very greatful for your help.

1.- First I need to send data through the Serial port from Arduino Uno to the esp8266 wifi module
2.- This module receives the data.
3.- It's connects to the WIFI.
4.- Sends the data with the METHOD POST to an external server (REST API)
I am new to Arduino. I appreciate your time and help.

The topology would look something like this:
https://www.circuitbasics.com/how-to-set-up-a-web-server-using-arduino-and-esp8266-01/

The example above uses the Esp8266 with the Espressif "AT" command set.

IF you also want to use Arduino to program the Esp8266, then you will need to replicate the functionality from the AT implementation.

Lots of examples here:
https://randomnerdtutorials.com/?s=ESP8266+post