Later edit, after following Majenko's advice

Here is the currently working code. An answer with the full implementation will come when the project is complete.

#include <Servo.h>

int txPin = 1;
int rxPin = 0;
int digitalPin = 7; // KY-028 digital interface
int analogPin = A2; // KY-028 analog interface
int angle = 0;
int temp;
bool incTemp = false, decTemp = false;

Servo servo;

void setup() {
  pinMode(digitalPin, INPUT);
  pinMode(analogPin, INPUT);

  Serial.begin(9600);
}

void loop() {
  temp = analogRead(analogPin);
  Serial.print("T");
  Serial.print(temp); 
  Serial.println();

  if(incTemp)
  {
    servo.attach(11);
    delay(100);
    
    servo.write(90);
    delay(100);
    servo.write(135);
    delay(100);
    servo.write(180);
    delay(100);
    servo.write(135);
    delay(100);

    servo.detach();
    delay(100);
  }
  else if(decTemp)
  {
    servo.attach(11);
    delay(100);
    
    servo.write(90);
    delay(100);
    servo.write(45);
    delay(100);
    servo.write(0);
    delay(100);
    servo.write(45);
    delay(100);

    servo.detach();
    delay(100);
  }

  delay(2000);
}

Edit

Here is the code:

#include <Servo.h>
#include <SoftwareSerial.h>

int txPin = 1;
int rxPin = 0;
int digitalPin = 7; // KY-028 digital interface
int analogPin = A2; // KY-028 analog interface
int angle = 0;
int temp;
bool incTemp = false, decTemp = false;

Servo servo;
SoftwareSerial BT(txPin,rxPin);

void setup() {
  pinMode(digitalPin, INPUT);
  pinMode(analogPin, INPUT);
  
  servo.attach(11);
  delay(100);

  BT.begin(9600);
  Serial.begin(9600);
}

void loop() {
  temp = analogRead(analogPin);
  Serial.println(temp); 

  if (BT.available())
  {
    char bytesToSend[2];
    bytesToSend[0] = 101;
    bytesToSend[1] = temp;
    bytesToSend[2] = 110;
    BT.println(bytesToSend);
  }

  if(incTemp)
  {
    servo.write(90);
    delay(100);
    servo.write(135);
    delay(100);
    servo.write(180);
    delay(100);
    servo.write(135);
    delay(100);
  }
  else if(decTemp)
  {
    servo.write(90);
    delay(100);
    servo.write(45);
    delay(100);
    servo.write(0);
    delay(100);
    servo.write(45);
    delay(100);
  }

  delay(2000);
}

For the incTemp and decTemp variables I will use an interrupt to detect when the Bluetooth paired device is sending a command to activate the servomotor. But for now, as it can be seen, the blocks that ask the servo to rotate cannot be reached. For the layout I will try to find a simulator that provides the components I use and I will come back with the design.