This video exactly helped on this situation on sending messages from Pi to Pico https://www.youtube.com/watch?v=KYpNk5MRbI8
Git: https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbDVvRDViMHpqeUtMZVNndHNpRkg2NFhXLUp6Z3xBQ3Jtc0tuQ3ZpRXFFWjdCTzR5bno5S0FnOHppNWRLSTlaVkozRHZuTk53V3dZQ01aN3Y5YlVLSWc2SnhiZ3pfZWlzNkFqMGJyNjV5YzFmdVN5bEE1UXVTblRodGM0OVlUQlpUZ3o5MWNUQWtEY0JZd0JEeWN2NA&q=https%3A%2F%2Fgithub.com%2Fkevinmcaleer%2Fpi_to_pico_bluetooth&v=KYpNk5MRbI8