I CANNOT CONNECT TO AWS IOT USING PAHO GOLANG

I have the following code made using golang:

` package main

import ( "crypto/tls" "crypto/x509" "fmt" "log" "os" "os/signal" "path/filepath"

MQTT "github.com/eclipse/paho.mqtt.golang"

)

func main() { MQTT.DEBUG = log.New(os.Stdout, "", 0) MQTT.ERROR = log.New(os.Stdout, "", 0)

// Get working dir path
dir, err := os.Getwd()
if err != nil {
	panic(err)
}

// Archivos
KeyPath := filepath.Join(dir, "assets", "otra_prueba.private.key")
CertPath := filepath.Join(dir, "assets", "otra_prueba.cert.pem")
CAPath1 := filepath.Join(dir, "assets", "root-CA.crt")
ClientId := "basicPubSub"
Endpoint := "a2fqp5ya964aj9-ats.iot.us-east-1.amazonaws.com"

// Carga de certificados
tlsCert, err := tls.LoadX509KeyPair(CertPath, KeyPath)
if err != nil {
	panic(err)
}

certs := x509.NewCertPool()
caPem1, err := os.ReadFile(CAPath1)
if err != nil {
	panic(err)
}

certs.AppendCertsFromPEM(caPem1)

tlsConfig := &tls.Config{
	Certificates: []tls.Certificate{tlsCert},
	RootCAs:      certs,
}

// Carga de opciones
options := MQTT.NewClientOptions()
options.AddBroker(fmt.Sprintf("tcps://%s:8883/mqtt", Endpoint))
options.SetClientID(ClientId)
options.SetTLSConfig(tlsConfig)

// Conexion
mqttClient := MQTT.NewClient(options)
if token := mqttClient.Connect(); token.Wait() && token.Error() != nil {
	panic(token.Error())
}

fmt.Println("[MQTT] Connected")

quit := make(chan struct{})
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
	<-c
	mqttClient.Disconnect(250)
	fmt.Println("[MQTT] Disconnected")

	quit <- struct{}{}
}()
<-quit

} ` //--------------------------------------------------------------------------------

Output the following response:

• $ go1.20.2 run cmd/main.go
• [client] Connect()
• [store] memorystore initialized
• [client] about to write new connect msg
• [client] socket connected to broker
• [client] Using MQTT 3.1.1 protocol
• [net] connect started
• [net] connect got error EOF
• [client] Trying reconnect using MQTT 3.1 protocol
• [client] socket connected to broker
• [client] Using MQTT 3.1 protocol
• [net] connect started
• [net] connect got error EOF
• [client] Failed to connect to a broker
• [store] memorystore closed
• panic: network Error : EOF

// --------------------------------------------------------------------------------- I think I'm using the certificates wrong. How can I connect to the mqtt broker