[Tinyos-help] How can I activate the acknowledgements?

[Maria Luisa Ruiz de Arbulo]

Hi,

I'm using TinyOS1.x to program CC2420 radio modules. I send packets 
from a sensor node to the controller using the interface 
'GenericComm', and I have realized that it doesn't use 
acknowledgements. To enable the packet acknowledgement I am using the 
'MacControl' interface: In the controller I call 'enableAck'  during 
the initialization. In the sensor node I call 'requestAck' before 
sending any packet. The program compiles without any error, but it 
seems that it continues not sending acknowledgements. What am I doing wrong?

Thanks in advance