How exactly ACK mechanism works like?

[catcher]

How exactly ACK mechanism works like?

1. I'm using Serial GW, should I implement ACK confirmation in my controler or Serial GW handle this?
2. If I'm sending message from NODE1 to NODE2 through Serial GW (NODE1->SerGW->NODE2) should ACK be sent from GW to NODE1 too or NODE2 should be responsible for sending ACK to NODE1 when received?
   Generally ACK is handled in low level implementation or should I carry about it in my code?
   Thanks in advace.
   Regards

[hek]

1. Acks is handled by the library. Need to do anything on the controller side.
2. You don't need to do anything on gw-side. The only thing you have to do is to pick up and/or potentially act on the ack message in your incomingMessage-function.

[catcher]

Great, thanks for answers.