[Tinyos-help] FW: HowTo use Acknowledge

[Ale]

I'm using TinyOS 2.x and as I read into TOSSIM tutorial "ackTime"
(considering CC2420) it makes to think me that this chip is able to handle
reliable connection by acks. So I suppose that it's already implemented, but
I don't know how I can use it. I saw interface PacketAcknowledgements but I
want to be sure that I haven't misunderstood that CC2420 provide it. I've
looked for into the tos/chips/cc2420 and I saw that it seems handled, but
I'm really beginner and I need to receive confirmation. 

Thanks