fix tests

satrs-core/src/hal/host/udp_server.rs

@@ -18,6 +18,7 @@ use std::vec::Vec;
 ///
 /// ```
 /// use std::net::{IpAddr, Ipv4Addr, SocketAddr, UdpSocket};
+/// use spacepackets::ecss::SerializablePusPacket;
 /// use satrs_core::hal::host::udp_server::UdpTcServer;
 /// use satrs_core::tmtc::{ReceivesTc, ReceivesTcCore};
 /// use spacepackets::SpHeader;