P.S. I did not change anything in my code from last month. The issue is board did not connect to cloud server and can still connect to wifi access point.

I have deleted all the Serial instructions from my own code and it still gives me the same error when I put my own code
When I change the speed to 38400 in the settings the same error appears even only with the RemoteXY code
The program only works well with
-115200 baud
-only remotexy code

[bcode from RemoteXY
// RemoteXY select connection mode and include library
#define REMOTEXY_MODE__ESP8266_HARDSERIAL_CLOUD
#include <RemoteXY.h>
// RemoteXY connection settings
#define REMOTEXY_SERIAL Serial
#define REMOTEXY_SERIAL_SPEED 115200
#define REMOTEXY_WIFI_SSID "DIGIFIBRA-kN73"
#define REMOTEXY_WIFI_PASSWORD "9xQGcg7uEz"
#define REMOTEXY_CLOUD_SERVER "cloud.remotexy.com"
#define REMOTEXY_CLOUD_PORT 6376
#define REMOTEXY_CLOUD_TOKEN "fe33b556a76662c782ac07bd7b6b6879"

// RemoteXY configurate 
#pragma pack(push, 1)
uint8_t RemoteXY_CONF[] =   // 129 bytes
  { 255,2,0,6,0,122,0,17,0,0,0,166,1,200,126,1,1,6,0,2,
  26,15,44,22,0,2,26,31,31,79,78,0,79,70,70,0,70,174,8,18,
  18,21,1,135,2,129,26,4,36,12,17,65,80,65,71,65,82,0,71,8,
  50,84,84,56,0,2,24,75,0,0,32,193,0,0,72,66,0,0,160,65,
  0,0,32,65,0,0,0,64,24,0,10,78,12,30,30,48,4,26,31,79,
  78,0,31,79,70,70,0,72,114,38,76,76,12,2,26,140,38,0,0,0,
  0,0,0,200,66,0,0,0,0 };
 
// this structure defines all the variables and events of your control interface
struct {

    // input variables
  uint8_t switch_1; // =1 if switch ON and =0 if OFF
  uint8_t pushSwitch_1; // =1 if state is ON, else =0

    // output variables
  uint8_t led_1; // led state
  float instrument_1; // from -10 to 50
  int8_t circularbar_1; // from 0 to 100
    // other variable
  uint8_t connect_flag;  // =1 if wire connected, else =0
} RemoteXY;
#pragma pack(pop)
#define PIN_SWITCH_1 13
void setup()
{
  RemoteXY_Init ();
  pinMode (PIN_SWITCH_1, OUTPUT);
}
void loop()
{
  RemoteXY_Handler ();
 
  digitalWrite(PIN_SWITCH_1, (RemoteXY.switch_1==0)?LOW:HIGH);
 
  // TODO you loop code
  // use the RemoteXY structure for data transfer
  // do not call delay(), use instead RemoteXY_delay()

}
my code:
// you can enable debug logging to Serial at 115200
//#define REMOTEXY__DEBUGLOG   

// RemoteXY select connection mode and include library
#define REMOTEXY_MODE__ESP8266_HARDSERIAL_CLOUD

#include <RemoteXY.h>

// RemoteXY connection settings
#define REMOTEXY_SERIAL Serial
#define REMOTEXY_SERIAL_SPEED 115200
#define REMOTEXY_WIFI_SSID "DIGIFIBRA-kN73"
#define REMOTEXY_WIFI_PASSWORD "9xQGcg7uEz"
#define REMOTEXY_CLOUD_SERVER "cloud.remotexy.com"
#define REMOTEXY_CLOUD_PORT 6376
#define REMOTEXY_CLOUD_TOKEN "5ba6888f6f17cee8d015cd76965dd4d3"

// RemoteXY configurate 
#pragma pack(push, 1)
uint8_t RemoteXY_CONF[] =   // 367 bytes
  { 255,7,0,4,0,104,1,17,0,0,0,19,2,200,126,106,200,1,1,16,
  0,71,2,1,75,75,6,255,95,95,56,0,36,24,135,0,0,32,193,0,
  0,72,66,0,0,160,65,0,0,32,65,0,0,0,64,24,0,2,104,26,
  32,12,2,95,46,16,0,2,26,31,31,79,78,0,79,70,70,0,2,150,
  26,33,13,1,125,47,18,0,2,26,31,31,79,78,0,79,70,70,0,2,
  104,44,32,12,57,95,45,15,0,2,26,31,31,79,78,0,79,70,70,0,
  2,150,62,34,13,57,74,45,15,0,2,26,31,31,79,78,0,79,70,70,
  0,2,105,62,32,14,2,74,46,14,0,2,26,31,31,79,78,0,79,70,
  70,0,129,20,52,36,5,36,58,35,5,8,84,69,77,80,69,82,65,84,
  85,82,65,0,2,104,89,90,34,3,174,100,25,0,2,26,31,31,79,78,
  0,79,70,70,0,129,130,82,40,6,26,165,54,8,8,84,79,68,79,83,
  32,70,79,67,79,83,0,129,106,22,25,4,8,90,37,6,8,69,115,113,
  117,105,110,97,32,67,97,115,97,0,129,153,22,26,4,31,117,40,6,8,
  70,79,67,79,32,67,65,83,69,84,65,0,129,153,40,29,4,64,90,28,
  6,24,86,101,110,116,105,108,97,100,111,114,0,129,154,58,28,4,59,69,
  41,6,8,69,110,116,114,97,100,97,32,67,97,115,101,116,97,0,129,107,
  58,26,4,6,68,39,6,8,76,97,116,101,114,97,108,32,67,97,115,101,
  116,97,0,4,153,75,8,23,55,128,43,14,128,93,26,129,160,70,20,8,
  96,130,7,9,8,37,0 };
 
// this structure defines all the variables and events of your control interface
struct {

    // input variables
  uint8_t EsquinaCasa; // =1 if switch ON and =0 if OFF
  uint8_t FocoInterno; // =1 if switch ON and =0 if OFF
  uint8_t Ventilador; // =1 if switch ON and =0 if OFF
  uint8_t EntradaCaseta; // =1 if switch ON and =0 if OFF
  uint8_t LateralCaseta; // =1 if switch ON and =0 if OFF
  uint8_t TodosFocos; // =1 if switch ON and =0 if OFF
  int8_t NivelLuz; // =0..100 slider position

    // output variables
  float TemperaturaInterior; // from -10 to 50

    // other variable
  uint8_t connect_flag;  // =1 if wire connected, else =0

} RemoteXY;
#pragma pack(pop)

// Sensores de Temperatura y Humedad
  #include <DHT.h>
  #include <DHT_U.h>
  #define SensorTemperaturaHumedad1 5 // Digital pin connected to the DHT sensor1
    DHT dht1(SensorTemperaturaHumedad1,DHT22);
    float TemperaturaInterior;
// Reloj
  //Pin 21 a SCL y pin 20 a SDA de arduino MEGA
  # include <Wire.h> // incluir libreria de 2 hilos
  # include <RTClib.h> // incluir libreria del reloj
  RTC_DS3231 rtc; // Definir variable rtc
  boolean Alarma =false;
  //DateTime fecha=rtc.now();
  int Ano,Mes,Dia,Hora,Minuto,Segundo;// Variables para acceder desde todos los modulos
// Entradas y Salidas
  boolean E_FocoPiscina=22,E_FocoLateralCaseta=24,E_FocoFrontalCaseta=26,
  E_FocoEsquinaCasa=28,E_FocoFachadaCasa=30,E_FocoCasaArbol=32,E_ConsumoAlto=34,E_TimbreArbol=36;//Entradas
  boolean E_PulsadorEntrada=38,E_CelulaLuminosidad=40,E_ParoBomba=42;//Entradas
  //int entradas[]={22,24,26,28,30,32}
  boolean S_ConsumoAlto=23,S_FocoEntradaFinca=25,S_PulsadorEntrada=27,S_LuzPorton=29,S_FocoEsquinaCasa=31,
  S_FocoFachadaCasa=33,S_FocoCuadroIberdrola=35,S_FocoEsquinaArboles=37;//Salidas
  boolean S_FocoColorPiscina=39,S_FocoEntradaCaseta=41,S_FocoLateralCaseta=43,S_Ventilador=45,
  S_FocoCasaArbol=47,S_TimbreCasaArbol=49,S_BombaPiscina=51;//Salidas
  boolean TodosFocosCuadro=0;// Variable que recoge cuando se encienden todos los focos
// Salida analogica de Foco Caseta
  int S_FocoCasetaPWN=3;

void setup()
{
  RemoteXY_Init ();
   
// Abrir puerto serie
  Serial.begin(115200);
// Sensores de Temperatura y Humedad 
  dht1.begin();
// Reloj 
  if(!rtc.begin()){
    Serial.println("Modulo RTC no encongtrado !");
    while (1);
  }
  rtc.adjust(DateTime(__DATE__,__TIME__));// ajuste de hora automatico el el ordenador
  //rtc.adjust(DateTime(2024,2,9,15,10,0));// ajuste de hora manual
// Entradas Salidas
  pinMode(E_FocoPiscina,INPUT);
  pinMode(E_FocoLateralCaseta,INPUT);
  pinMode(E_FocoFrontalCaseta,INPUT);
  pinMode(E_FocoEsquinaCasa,INPUT);
  pinMode(E_FocoFachadaCasa,INPUT);
  pinMode(E_FocoCasaArbol,INPUT);
  pinMode(E_ConsumoAlto,INPUT);
  pinMode(E_TimbreArbol,INPUT);
  pinMode(E_PulsadorEntrada,INPUT);
  pinMode(E_CelulaLuminosidad,INPUT);
  pinMode(E_ParoBomba,INPUT);
 
  pinMode(S_ConsumoAlto,OUTPUT);
  pinMode(S_FocoEntradaFinca,OUTPUT);
  pinMode(S_PulsadorEntrada,OUTPUT);
  pinMode(S_LuzPorton,OUTPUT);
  pinMode(S_FocoEsquinaCasa,OUTPUT);
  pinMode(S_FocoFachadaCasa,OUTPUT);
  pinMode(S_FocoCuadroIberdrola,OUTPUT);
  pinMode(S_FocoEsquinaArboles,OUTPUT);
  pinMode(S_FocoColorPiscina,OUTPUT);
  pinMode(S_FocoEntradaCaseta,OUTPUT);
  pinMode(S_FocoLateralCaseta,OUTPUT);
  pinMode(S_Ventilador,OUTPUT);
  pinMode(S_FocoCasaArbol,OUTPUT);
  pinMode(S_TimbreCasaArbol,OUTPUT);
  pinMode(S_BombaPiscina,OUTPUT);
}

void loop()
{
  RemoteXY_Handler ();
// Pasar a la APP el valor de temperatura
  RemoteXY.TemperaturaInterior=TemperaturaInterior;
// Temperatura y Humedad
    TemperaturaInterior=dht1.readTemperature();
// Reloj
  DateTime fecha=rtc.now();
  //Ano=fecha.year();
  Mes=fecha.month();
  Dia=fecha.day();
  Hora=fecha.hour();
  Minuto=fecha.minute();
  //Segundo=fecha.second();
// Variable Encender Todos Focos
  if(digitalRead(S_FocoEntradaCaseta)==1 && digitalRead(S_FocoLateralCaseta)==1
   && digitalRead(S_FocoFachadaCasa)==1 && digitalRead(S_FocoEsquinaCasa)==1){TodosFocosCuadro=1;}
  else {TodosFocosCuadro=0;}
//  SALIDAS
/*
// piscina Bomba
  // Parar bomba de piscina desde pozo por arranque de BOMBA PISCINA o desde casa por consumo electrico alto
  if (digitalRead(E_ParoBomba)==1 || digitalRead(S_ConsumoAlto)==1)
  {digitalWrite(S_BombaPiscina,HIGH);}
  else {digitalWrite(S_BombaPiscina,LOW);}
// Foco de piscina
  if (digitalRead(E_FocoPiscina)==1){digitalWrite(S_FocoColorPiscina,HIGH);}
  else {digitalWrite(S_FocoColorPiscina,LOW);}
//Timbre de pulsador entrada a Finca en Casa
    if (digitalRead(E_PulsadorEntrada)==1){digitalWrite(S_PulsadorEntrada,HIGH);}
    else{digitalWrite(S_PulsadorEntrada,LOW);}
// Foco de fachada Casa
  if((Hora==2 && Minuto==12) || digitalRead(E_FocoFachadaCasa)==1
   || RemoteXY.TodosFocos==11){digitalWrite(S_FocoFachadaCasa,HIGH);}
  else {digitalWrite(S_FocoFachadaCasa,LOW);}
// Foco Casa Arbol
  if((Hora==3 && Minuto==33) || digitalRead(E_FocoCasaArbol)==1)
  {digitalWrite(S_FocoCasaArbol,HIGH);}
  else {digitalWrite(S_FocoCasaArbol,LOW);}
// Foco esquina de los Arboles
  if((Hora==3 && Minuto==22) || TodosFocosCuadro==1 ||RemoteXY.TodosFocos==1)
  {digitalWrite(S_FocoEsquinaCasa,HIGH);}
  else {digitalWrite(S_FocoEsquinaCasa,LOW);}
// Timbre casa arbol
  if(digitalRead(E_TimbreArbol)==1){digitalWrite(S_TimbreCasaArbol,HIGH);}
  else{digitalWrite(S_TimbreCasaArbol,LOW);}
//Foco del cuadro de contadores de IBERDROLA
  if((Hora==2 && Minuto==44) || TodosFocosCuadro==1 ||RemoteXY.TodosFocos==1)
  {digitalWrite(S_FocoCuadroIberdrola,HIGH);}
  else {digitalWrite(S_FocoCuadroIberdrola,LOW);}
//Parar bomba de pozo por consumo electrico alto en casa
  if(digitalRead(E_ConsumoAlto)==1){digitalWrite(S_ConsumoAlto,HIGH);}
  else{digitalWrite(S_ConsumoAlto,LOW);}
// Salida de Foco entrada Caseta
  if ((Hora==3 && Minuto>=1) || digitalRead(E_FocoFrontalCaseta)==1 ||
  TodosFocosCuadro==1 || RemoteXY.EntradaCaseta==1 || RemoteXY.TodosFocos==1)
  {digitalWrite(S_FocoEntradaCaseta,HIGH);}
  else {digitalWrite(S_FocoEntradaCaseta,LOW);}
// Salida foco lateral mirando a Piscina
  if ((Hora==3 && Minuto>=1) || digitalRead(E_FocoLateralCaseta)==1 ||
  TodosFocosCuadro==1 || RemoteXY.LateralCaseta==1 || RemoteXY.TodosFocos==1)
  {digitalWrite(S_FocoLateralCaseta,HIGH);}
  else {digitalWrite(S_FocoLateralCaseta,LOW);}
// Salida Ventilador
  if(TemperaturaInterior<=22 && TemperaturaInterior>=10 && RemoteXY.Ventilador)
  {digitalWrite(S_Ventilador,HIGH);}
  else{digitalWrite(S_Ventilador,LOW);}
// Foco del interior encima de cuadro
    int y;
    y=map(RemoteXY.NivelLuz ,0,100,0,255);
    if(RemoteXY.FocoInterno==1){
    analogWrite(S_FocoCasetaPWN,y);}
    else{analogWrite(S_FocoCasetaPWN,0);}
// foco esquina casa
  if((Hora==4 && Minuto==22) || digitalRead(E_FocoEsquinaCasa)==1 ||TodosFocosCuadro==1
  || RemoteXY.EsquinaCasa==1 || RemoteXY.TodosFocos==1)
  {digitalWrite(S_FocoEsquinaCasa,HIGH);}
  else{digitalWrite(S_FocoEsquinaCasa,LOW);}
//Impresion(); //Esto bloquea la conexion RemoteXY
/*
  Serial.print(Ano);
  Serial.print("/");
  Serial.print(Mes);
  Serial.print("/");
  Serial.print(Dia);
  Serial.print("/");
  Serial.print(Hora);
  Serial.print("/");
  Serial.print(Minuto);
  Serial.print("/");
  Serial.print(Segundo);
  Serial.print("       ");
  Serial.print("/");
  Serial.print(TemperaturaInterior);
  Serial.println();
// Variable Encender Todos Focos
  if(digitalRead(S_FocoEntradaCaseta)==1 && digitalRead(S_FocoLateralCaseta)==1
   && digitalRead(S_FocoFachadaCasa)==1 && digitalRead(S_FocoEsquinaCasa)==1){TodosFocosCuadro=1;}
  else {TodosFocosCuadro=0;}
*/
}