### nncp-ack ¶

    $ nncp-ack [options] -all
    $ nncp-ack [options] -node NODE[,...]
    $ nncp-ack [options] -node NODE -pkt PKT

    $ nncp-ack [...] 4>&1 >&2 | nncp-rm [...] -pkt

Send acknowledgement of successful `PKT` (Base32-encoded hash) packet receipt from `NODE` node. If no `-pkt` is specified, then acknowledge all packet in node’s `rx` spool. If `-all` is specified, then do that for all nodes.

That commands outputs list of created encrypted ACK packets (`NODE/PKT`) to 4th file descriptor. That output can be passed for example to `nncp-rm` to remove them after transmission to not wait for acknowledgement and retransmission.