Mcreator Link Arduino

Hello, 

I´m trying use the CustomMessages from examples for Arduino.

In code:

if(command.equals("customCommand1")) {
    // do something

     digitalWrite(13,HIGH); // I write this
  }

In game i don´t know how to use the command. I try:

/link sendmessage customCommand1?data

/link sendmessage customCommand

/link sendmessage customCommand?1

If I send  /link digitalwrite 13 1 it works, but I need Send Messages.

Any tip?