I think it has been done by  calling (ackPending && !call 
PacketAcknowledgements.wasAcked(msg)) ?
But why not using PackLinkC, which also provides link layer retransmission?

- Hui Kang

Hui Kang wrote:
> The TEP 123 about CTP says CTP must be compiled with link layer 
> acknowledgment enable. However, in the application of TestNetwork, the 
> makefile does not include CFLAGS += -DPACKET_LINK. Is that correct?
> Thanks in advance.
>
> - Hui Kang
>
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