AT command XBee from atmega to disable DIO5 (associated led)
finally I solved the problem with this code:

uint8_t atdCmd[]={'D','5'};
uint8_t value[]={4};///pongo DIO5 a output LOW
uint8_t length=1;
AtCommandRequest atRequest = AtCommandRequest(atdCmd, value, length);
xbee.send(atRequest);


The problem was that I tried to put command with 5 caracters,... and only accepts 2 caracters for "AT command"