AF_DataReq Ack

Hi,

You could use a while loop to wait while you dont receive the ack. 
The code should look something like the following.

while(data Ack is not received )
{
// loop untill you receive the ack
}

//Check status in AF_DATA_CONFIRM_CMD

Is there any chances  that, i will not get ack?. If there, then my app will hang there, right?

Yes, there is a chance that you wont receive the Ack, in that case you will have to have a timeout variable which will exit the while loop after a specified number of iterations. For example, you could do something like in the following code.

int timeout = 500;
while(data Ack is not received && timeout-- > 0)
{
// loop untill you receive the ack
}

//Check status in AF_DATA_CONFIRM_CMD

Yes. If the destination is not there, you won't receive ACK. in this case, Hector's suggestion will have a deadlock. I would suggest you keep a structure that contains sequence number in AF_DataReq and a Boolean dataack to false first. In AF_DATA_CONFIRM_CMD, you check the matched sequence number and label dataack to true. Also, you can have a event does periodic check on this data structure to see if there is any message that doesn't have ack. If so, you can resend it.