/*
### 3.3. PUSH_ACK packet ###
That packet type is used by the server to acknowledge immediately all the
PUSH_DATA packets received.
Bytes | Function
:------:|---------------------------------------------------------------------
0 | protocol version = 2
1-2 | same token as the PUSH_DATA packet to acknowledge
3 | PUSH_ACK identifier 0x01
*/
use simple_down_packet;
use ;
use ;
simple_down_packet!;