Hello,
The project is complete and working well.
I attach photos to feed the album of the site.

Sincerely.

Hello,
@mfalkvidd thank you, that was right, so I changed the values and now no more ghost CHILDID. Thank you very much!

#define MY_GATEWAY_SERIAL
#define MY_TRANSPORT_WAIT_READY_MS 5000        
#define MY_GATEWAY_SERIAL_BAUD_RATE 115200
#define MY_DEBUG
#define CHILD_ID_ARMED 0                    
#define CHILD_ID_PORTAIL2 1                      
#define CHILD_ID_PORTILLON2 2                     
#define CHILD_ID_Texte1 3                    
#define CHILD_ID_Texte2 4                      
#define Code_ON 0                             
#define Code_OFF 1                           

Have a nice day