diff --git a/satrs-core/Cargo.toml b/satrs-core/Cargo.toml
index d9a14c3..d709d3a 100644
--- a/satrs-core/Cargo.toml
+++ b/satrs-core/Cargo.toml
@@ -64,7 +64,7 @@ optional = true
 # version = "0.6"
 # path = "../spacepackets"
 git = "https://egit.irs.uni-stuttgart.de/rust/spacepackets.git"
-rev = "eca7e09d19"
+rev = "46eab3529004"
 default-features = false
 
 [dev-dependencies]
diff --git a/satrs-core/src/hal/host/udp_server.rs b/satrs-core/src/hal/host/udp_server.rs
index 24be835..de5a3f0 100644
--- a/satrs-core/src/hal/host/udp_server.rs
+++ b/satrs-core/src/hal/host/udp_server.rs
@@ -22,7 +22,7 @@ use std::vec::Vec;
 /// use satrs_core::hal::host::udp_server::UdpTcServer;
 /// use satrs_core::tmtc::{ReceivesTc, ReceivesTcCore};
 /// use spacepackets::SpHeader;
-/// use spacepackets::ecss::tc::PusTc;
+/// use spacepackets::ecss::tc::PusTcCreator;
 ///
 /// #[derive (Default)]
 /// struct PingReceiver {}
@@ -40,7 +40,7 @@ use std::vec::Vec;
 /// let mut udp_tc_server = UdpTcServer::new(dest_addr, 2048, Box::new(ping_receiver))
 ///       .expect("Creating UDP TMTC server failed");
 /// let mut sph = SpHeader::tc_unseg(0x02, 0, 0).unwrap();
-/// let pus_tc = PusTc::new_simple(&mut sph, 17, 1, None, true);
+/// let pus_tc = PusTcCreator::new_simple(&mut sph, 17, 1, None, true);
 /// let len = pus_tc
 ///     .write_to_bytes(&mut buf)
 ///     .expect("Error writing PUS TC packet");
@@ -142,7 +142,7 @@ impl<E: 'static> UdpTcServer<E> {
 mod tests {
     use crate::hal::host::udp_server::{ReceiveResult, UdpTcServer};
     use crate::tmtc::ReceivesTcCore;
-    use spacepackets::ecss::tc::PusTc;
+    use spacepackets::ecss::tc::PusTcCreator;
     use spacepackets::ecss::SerializablePusPacket;
     use spacepackets::SpHeader;
     use std::boxed::Box;
@@ -178,7 +178,7 @@ mod tests {
             .expect("Creating UDP TMTC server failed");
         is_send(&udp_tc_server);
         let mut sph = SpHeader::tc_unseg(0x02, 0, 0).unwrap();
-        let pus_tc = PusTc::new_simple(&mut sph, 17, 1, None, true);
+        let pus_tc = PusTcCreator::new_simple(&mut sph, 17, 1, None, true);
         let len = pus_tc
             .write_to_bytes(&mut buf)
             .expect("Error writing PUS TC packet");
diff --git a/satrs-core/src/pus/event.rs b/satrs-core/src/pus/event.rs
index f48ba29..954c77d 100644
--- a/satrs-core/src/pus/event.rs
+++ b/satrs-core/src/pus/event.rs
@@ -281,8 +281,8 @@ mod tests {
                     panic!("TestSender: unexpected call with address");
                 }
                 PusTmWrapper::Direct(tm) => {
-                    assert!(tm.source_data().is_some());
-                    let src_data = tm.source_data().unwrap();
+                    assert!(!tm.source_data().is_empty());
+                    let src_data = tm.source_data();
                     assert!(src_data.len() >= 4);
                     let event =
                         EventU32::from(u32::from_be_bytes(src_data[0..4].try_into().unwrap()));
diff --git a/satrs-core/src/pus/event_srv.rs b/satrs-core/src/pus/event_srv.rs
index 69ee867..0677598 100644
--- a/satrs-core/src/pus/event_srv.rs
+++ b/satrs-core/src/pus/event_srv.rs
@@ -65,12 +65,12 @@ impl PusServiceHandler for PusService5EventHandler {
             ));
         }
         let handle_enable_disable_request = |enable: bool, stamp: [u8; 7]| {
-            if tc.user_data().is_none() || tc.user_data().unwrap().len() < 4 {
+            if tc.user_data().len() < 4 {
                 return Err(PusPacketHandlingError::NotEnoughAppData(
                     "At least 4 bytes event ID expected".into(),
                 ));
             }
-            let user_data = tc.user_data().unwrap();
+            let user_data = tc.user_data();
             let event_u32 = EventU32::from(u32::from_be_bytes(user_data[0..4].try_into().unwrap()));
             let start_token = self
                 .psb
diff --git a/satrs-core/src/pus/mod.rs b/satrs-core/src/pus/mod.rs
index fa21ea2..f44a12a 100644
--- a/satrs-core/src/pus/mod.rs
+++ b/satrs-core/src/pus/mod.rs
@@ -232,7 +232,9 @@ pub trait EcssTcReceiverCore: EcssChannel {
 
 /// Generic trait for objects which can receive ECSS PUS telecommands. This trait is
 /// implemented by the [crate::tmtc::pus_distrib::PusDistributor] objects to allow passing PUS TC
-/// packets into it.
+/// packets into it. It is generally assumed that the telecommand is stored in some pool structure,
+/// and the store address is passed as well. This allows efficient zero-copy forwarding of
+/// telecommands.
 pub trait ReceivesEcssPusTc {
     type Error;
     fn pass_pus_tc(&mut self, header: &SpHeader, pus_tc: &PusTcReader) -> Result<(), Self::Error>;
@@ -317,7 +319,7 @@ pub mod std_mod {
     use crate::ChannelId;
     use alloc::boxed::Box;
     use alloc::vec::Vec;
-    use spacepackets::ecss::tm::{PusTm, PusTmCreator};
+    use spacepackets::ecss::tm::PusTmCreator;
     use spacepackets::ecss::PusError;
     use spacepackets::time::cds::TimeProvider;
     use spacepackets::time::StdTimestampError;
@@ -641,7 +643,7 @@ pub(crate) fn source_buffer_large_enough(cap: usize, len: usize) -> Result<(), E
 
 #[cfg(test)]
 pub(crate) mod tests {
-    use spacepackets::ecss::tm::{GenericPusTmSecondaryHeader, PusTm};
+    use spacepackets::ecss::tm::{GenericPusTmSecondaryHeader, PusTmCreator};
     use spacepackets::CcsdsPacket;
 
     #[derive(Debug, Eq, PartialEq, Clone)]
@@ -654,7 +656,7 @@ pub(crate) mod tests {
     }
 
     impl CommonTmInfo {
-        pub fn new_from_tm(tm: &PusTm) -> Self {
+        pub fn new_from_tm(tm: &PusTmCreator) -> Self {
             let mut time_stamp = [0; 7];
             time_stamp.clone_from_slice(&tm.timestamp().unwrap()[0..7]);
             Self {
diff --git a/satrs-core/src/pus/scheduler.rs b/satrs-core/src/pus/scheduler.rs
index 8f67a94..2a91bf1 100644
--- a/satrs-core/src/pus/scheduler.rs
+++ b/satrs-core/src/pus/scheduler.rs
@@ -8,7 +8,7 @@ use core::time::Duration;
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 use spacepackets::ecss::scheduling::TimeWindowType;
-use spacepackets::ecss::tc::{GenericPusTcSecondaryHeader, PusTc};
+use spacepackets::ecss::tc::{GenericPusTcSecondaryHeader, IsPusTelecommand};
 use spacepackets::ecss::PusError;
 use spacepackets::time::{CcsdsTimeProvider, TimestampError, UnixTimestamp};
 use spacepackets::CcsdsPacket;
@@ -46,7 +46,9 @@ impl RequestId {
         self.seq_count
     }
 
-    pub fn from_tc(tc: &PusTc) -> Self {
+    pub fn from_tc(
+        tc: &(impl CcsdsPacket + GenericPusTcSecondaryHeader + IsPusTelecommand),
+    ) -> Self {
         RequestId {
             source_id: tc.source_id(),
             apid: tc.apid(),
@@ -57,22 +59,6 @@ impl RequestId {
     pub fn as_u64(&self) -> u64 {
         ((self.source_id as u64) << 32) | ((self.apid as u64) << 16) | self.seq_count as u64
     }
-
-    /*
-    pub fn from_bytes(buf: &[u8]) -> Result<Self, ByteConversionError> {
-        if buf.len() < core::mem::size_of::<u64>() {
-            return Err(ByteConversionError::FromSliceTooSmall(SizeMissmatch {
-                found: buf.len(),
-                expected: core::mem::size_of::<u64>(),
-            }));
-        }
-        Ok(Self {
-            source_id: u16::from_be_bytes(buf[0..2].try_into().unwrap()),
-            apid: u16::from_be_bytes(buf[2..4].try_into().unwrap()),
-            seq_count: u16::from_be_bytes(buf[4..6].try_into().unwrap()),
-        })
-    }
-     */
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -239,7 +225,9 @@ pub mod alloc_mod {
     use alloc::vec::Vec;
     use core::time::Duration;
     use spacepackets::ecss::scheduling::TimeWindowType;
-    use spacepackets::ecss::tc::PusTc;
+    use spacepackets::ecss::tc::{
+        GenericPusTcSecondaryHeader, IsPusTelecommand, PusTc, PusTcReader,
+    };
     use spacepackets::ecss::PusPacket;
     use spacepackets::time::cds::DaysLen24Bits;
     use spacepackets::time::{cds, CcsdsTimeProvider, TimeReader, UnixTimestamp};
@@ -387,7 +375,7 @@ pub mod alloc_mod {
             tc: &[u8],
             pool: &mut (impl PoolProvider + ?Sized),
         ) -> Result<TcInfo, ScheduleError> {
-            let check_tc = PusTc::from_bytes(tc)?;
+            let check_tc = PusTcReader::new(tc)?;
             if PusPacket::service(&check_tc.0) == 11 && PusPacket::subservice(&check_tc.0) == 4 {
                 return Err(ScheduleError::NestedScheduledTc);
             }
@@ -407,7 +395,7 @@ pub mod alloc_mod {
         /// provider needs to be supplied via a generic.
         pub fn insert_wrapped_tc<TimeStamp: CcsdsTimeProvider + TimeReader>(
             &mut self,
-            pus_tc: &PusTc,
+            pus_tc: &(impl IsPusTelecommand + PusPacket + GenericPusTcSecondaryHeader),
             pool: &mut (impl PoolProvider + ?Sized),
         ) -> Result<TcInfo, ScheduleError> {
             if PusPacket::service(pus_tc) != 11 {
@@ -416,14 +404,14 @@ pub mod alloc_mod {
             if PusPacket::subservice(pus_tc) != 4 {
                 return Err(ScheduleError::WrongSubservice);
             }
-            return if let Some(user_data) = pus_tc.user_data() {
-                let stamp: TimeStamp = TimeReader::from_bytes(user_data)?;
-                let unix_stamp = stamp.unix_stamp();
-                let stamp_len = stamp.len_as_bytes();
-                self.insert_unwrapped_tc(unix_stamp, &user_data[stamp_len..], pool)
-            } else {
-                Err(ScheduleError::TcDataEmpty)
-            };
+            if pus_tc.user_data().is_empty() {
+                return Err(ScheduleError::TcDataEmpty);
+            }
+            let user_data = pus_tc.user_data();
+            let stamp: TimeStamp = TimeReader::from_bytes(user_data)?;
+            let unix_stamp = stamp.unix_stamp();
+            let stamp_len = stamp.len_as_bytes();
+            self.insert_unwrapped_tc(unix_stamp, &user_data[stamp_len..], pool)
         }
 
         /// Insert a telecommand based on the fully wrapped time-tagged telecommand using a CDS
@@ -641,7 +629,7 @@ mod tests {
     use super::*;
     use crate::pool::{LocalPool, PoolCfg, PoolProvider, StoreAddr, StoreError};
     use alloc::collections::btree_map::Range;
-    use spacepackets::ecss::tc::{PusTc, PusTcSecondaryHeader};
+    use spacepackets::ecss::tc::{PusTcCreator, PusTcReader, PusTcSecondaryHeader};
     use spacepackets::ecss::SerializablePusPacket;
     use spacepackets::time::{cds, TimeWriter, UnixTimestamp};
     use spacepackets::SpHeader;
@@ -662,32 +650,32 @@ mod tests {
         )
     }
 
-    fn scheduled_tc(timestamp: UnixTimestamp, buf: &mut [u8]) -> PusTc {
+    fn scheduled_tc(timestamp: UnixTimestamp, buf: &mut [u8]) -> PusTcCreator {
         let (mut sph, len_app_data) = pus_tc_base(timestamp, buf);
-        PusTc::new_simple(&mut sph, 11, 4, Some(&buf[..len_app_data]), true)
+        PusTcCreator::new_simple(&mut sph, 11, 4, Some(&buf[..len_app_data]), true)
     }
 
-    fn wrong_tc_service(timestamp: UnixTimestamp, buf: &mut [u8]) -> PusTc {
+    fn wrong_tc_service(timestamp: UnixTimestamp, buf: &mut [u8]) -> PusTcCreator {
         let (mut sph, len_app_data) = pus_tc_base(timestamp, buf);
-        PusTc::new_simple(&mut sph, 12, 4, Some(&buf[..len_app_data]), true)
+        PusTcCreator::new_simple(&mut sph, 12, 4, Some(&buf[..len_app_data]), true)
     }
 
-    fn wrong_tc_subservice(timestamp: UnixTimestamp, buf: &mut [u8]) -> PusTc {
+    fn wrong_tc_subservice(timestamp: UnixTimestamp, buf: &mut [u8]) -> PusTcCreator {
         let (mut sph, len_app_data) = pus_tc_base(timestamp, buf);
-        PusTc::new_simple(&mut sph, 11, 5, Some(&buf[..len_app_data]), true)
+        PusTcCreator::new_simple(&mut sph, 11, 5, Some(&buf[..len_app_data]), true)
     }
 
-    fn double_wrapped_time_tagged_tc(timestamp: UnixTimestamp, buf: &mut [u8]) -> PusTc {
+    fn double_wrapped_time_tagged_tc(timestamp: UnixTimestamp, buf: &mut [u8]) -> PusTcCreator {
         let cds_time = cds::TimeProvider::from_unix_secs_with_u16_days(&timestamp).unwrap();
         let len_time_stamp = cds_time.write_to_bytes(buf).unwrap();
         let mut sph = SpHeader::tc_unseg(0x02, 0x34, 0).unwrap();
         // app data should not matter, double wrapped time-tagged commands should be rejected right
         // away
-        let inner_time_tagged_tc = PusTc::new_simple(&mut sph, 11, 4, None, true);
+        let inner_time_tagged_tc = PusTcCreator::new_simple(&mut sph, 11, 4, None, true);
         let packet_len = inner_time_tagged_tc
             .write_to_bytes(&mut buf[len_time_stamp..])
             .expect("writing inner time tagged tc failed");
-        PusTc::new_simple(
+        PusTcCreator::new_simple(
             &mut sph,
             11,
             4,
@@ -696,14 +684,17 @@ mod tests {
         )
     }
 
-    fn invalid_time_tagged_cmd() -> PusTc<'static> {
+    fn invalid_time_tagged_cmd() -> PusTcCreator<'static> {
         let mut sph = SpHeader::tc_unseg(0x02, 0x34, 1).unwrap();
-        PusTc::new_simple(&mut sph, 11, 4, None, true)
+        PusTcCreator::new_simple(&mut sph, 11, 4, None, true)
     }
 
-    fn base_ping_tc_simple_ctor(seq_count: u16, app_data: Option<&'static [u8]>) -> PusTc<'static> {
+    fn base_ping_tc_simple_ctor(
+        seq_count: u16,
+        app_data: Option<&'static [u8]>,
+    ) -> PusTcCreator<'static> {
         let mut sph = SpHeader::tc_unseg(0x02, seq_count, 0).unwrap();
-        PusTc::new_simple(&mut sph, 17, 1, app_data, true)
+        PusTcCreator::new_simple(&mut sph, 17, 1, app_data, true)
     }
 
     fn ping_tc_to_store(
@@ -870,7 +861,7 @@ mod tests {
         let mut sp_header = SpHeader::tc_unseg(apid_to_set, 105, 0).unwrap();
         let mut sec_header = PusTcSecondaryHeader::new_simple(17, 1);
         sec_header.source_id = src_id_to_set;
-        let ping_tc = PusTc::new(&mut sp_header, sec_header, None, true);
+        let ping_tc = PusTcCreator::new(&mut sp_header, sec_header, None, true);
         let req_id = RequestId::from_tc(&ping_tc);
         assert_eq!(req_id.source_id(), src_id_to_set);
         assert_eq!(req_id.apid(), apid_to_set);
@@ -1085,7 +1076,7 @@ mod tests {
         assert!(pool.has_element_at(&tc_info_0.addr()).unwrap());
 
         let data = pool.read(&tc_info_0.addr()).unwrap();
-        let check_tc = PusTc::from_bytes(&data).expect("incorrect Pus tc raw data");
+        let check_tc = PusTcReader::new(&data).expect("incorrect Pus tc raw data");
         assert_eq!(check_tc.0, base_ping_tc_simple_ctor(0, None));
 
         assert_eq!(scheduler.num_scheduled_telecommands(), 1);
@@ -1107,7 +1098,7 @@ mod tests {
             .unwrap();
 
         let data = pool.read(&addr_vec[0]).unwrap();
-        let check_tc = PusTc::from_bytes(&data).expect("incorrect Pus tc raw data");
+        let check_tc = PusTcReader::new(&data).expect("incorrect Pus tc raw data");
         assert_eq!(check_tc.0, base_ping_tc_simple_ctor(0, None));
     }
 
@@ -1131,7 +1122,7 @@ mod tests {
         assert!(pool.has_element_at(&info.addr).unwrap());
 
         let data = pool.read(&info.addr).unwrap();
-        let check_tc = PusTc::from_bytes(&data).expect("incorrect Pus tc raw data");
+        let check_tc = PusTcReader::new(&data).expect("incorrect Pus tc raw data");
         assert_eq!(check_tc.0, base_ping_tc_simple_ctor(0, None));
 
         assert_eq!(scheduler.num_scheduled_telecommands(), 1);
@@ -1153,7 +1144,7 @@ mod tests {
             .unwrap();
 
         let data = pool.read(&addr_vec[0]).unwrap();
-        let check_tc = PusTc::from_bytes(&data).expect("incorrect Pus tc raw data");
+        let check_tc = PusTcReader::new(&data).expect("incorrect PUS tc raw data");
         assert_eq!(check_tc.0, base_ping_tc_simple_ctor(0, None));
     }
 
diff --git a/satrs-core/src/pus/test.rs b/satrs-core/src/pus/test.rs
index fcf0c97..ac716f2 100644
--- a/satrs-core/src/pus/test.rs
+++ b/satrs-core/src/pus/test.rs
@@ -5,7 +5,7 @@ use crate::pus::{
     PusPacketHandlingError, PusServiceBase, PusServiceHandler, PusTmWrapper,
 };
 use spacepackets::ecss::tc::PusTc;
-use spacepackets::ecss::tm::{PusTm, PusTmCreator, PusTmSecondaryHeader};
+use spacepackets::ecss::tm::{PusTmCreator, PusTmSecondaryHeader};
 use spacepackets::ecss::PusPacket;
 use spacepackets::SpHeader;
 use std::boxed::Box;
@@ -116,8 +116,8 @@ mod tests {
     };
     use crate::pus::{MpscTcInStoreReceiver, MpscTmInStoreSender, PusServiceHandler};
     use crate::tmtc::tm_helper::SharedTmStore;
-    use spacepackets::ecss::tc::{PusTc, PusTcSecondaryHeader};
-    use spacepackets::ecss::tm::PusTm;
+    use spacepackets::ecss::tc::{PusTcCreator, PusTcSecondaryHeader};
+    use spacepackets::ecss::tm::PusTmReader;
     use spacepackets::ecss::{PusPacket, SerializablePusPacket};
     use spacepackets::{SequenceFlags, SpHeader};
     use std::boxed::Box;
@@ -154,7 +154,7 @@ mod tests {
         // Create a ping TC, verify acceptance.
         let mut sp_header = SpHeader::tc(TEST_APID, SequenceFlags::Unsegmented, 0, 0).unwrap();
         let sec_header = PusTcSecondaryHeader::new_simple(17, 1);
-        let ping_tc = PusTc::new(&mut sp_header, sec_header, None, true);
+        let ping_tc = PusTcCreator::new(&mut sp_header, sec_header, None, true);
         let token = verification_handler.add_tc(&ping_tc);
         let token = verification_handler
             .acceptance_success(token, None)
@@ -174,10 +174,10 @@ mod tests {
         let mut tm_addr = next_msg.unwrap();
         let tm_pool = tm_pool_shared.read().unwrap();
         let tm_raw = tm_pool.read(&tm_addr).unwrap();
-        let (tm, _) = PusTm::from_bytes(&tm_raw, 0).unwrap();
+        let (tm, _) = PusTmReader::new(&tm_raw, 0).unwrap();
         assert_eq!(tm.service(), 1);
         assert_eq!(tm.subservice(), 1);
-        let req_id = RequestId::from_bytes(tm.user_data().unwrap()).unwrap();
+        let req_id = RequestId::from_bytes(tm.user_data()).expect("generating request ID failed");
         assert_eq!(req_id, token.req_id());
 
         // Acceptance TM
@@ -186,10 +186,10 @@ mod tests {
         tm_addr = next_msg.unwrap();
         let tm_raw = tm_pool.read(&tm_addr).unwrap();
         // Is generated with CDS short timestamp.
-        let (tm, _) = PusTm::from_bytes(&tm_raw, 7).unwrap();
+        let (tm, _) = PusTmReader::new(&tm_raw, 7).unwrap();
         assert_eq!(tm.service(), 1);
         assert_eq!(tm.subservice(), 3);
-        let req_id = RequestId::from_bytes(tm.user_data().unwrap()).unwrap();
+        let req_id = RequestId::from_bytes(tm.user_data()).expect("generating request ID failed");
         assert_eq!(req_id, token.req_id());
 
         // Ping reply
@@ -198,10 +198,10 @@ mod tests {
         tm_addr = next_msg.unwrap();
         let tm_raw = tm_pool.read(&tm_addr).unwrap();
         // Is generated with CDS short timestamp.
-        let (tm, _) = PusTm::from_bytes(&tm_raw, 7).unwrap();
+        let (tm, _) = PusTmReader::new(&tm_raw, 7).unwrap();
         assert_eq!(tm.service(), 17);
         assert_eq!(tm.subservice(), 2);
-        assert!(tm.user_data().is_none());
+        assert!(tm.user_data().is_empty());
 
         // TM completion
         next_msg = tm_rx.try_recv();
@@ -209,10 +209,10 @@ mod tests {
         tm_addr = next_msg.unwrap();
         let tm_raw = tm_pool.read(&tm_addr).unwrap();
         // Is generated with CDS short timestamp.
-        let (tm, _) = PusTm::from_bytes(&tm_raw, 7).unwrap();
+        let (tm, _) = PusTmReader::new(&tm_raw, 7).unwrap();
         assert_eq!(tm.service(), 1);
         assert_eq!(tm.subservice(), 7);
-        let req_id = RequestId::from_bytes(tm.user_data().unwrap()).unwrap();
+        let req_id = RequestId::from_bytes(tm.user_data()).expect("generating request ID failed");
         assert_eq!(req_id, token.req_id());
     }
 }
diff --git a/satrs-core/src/pus/verification.rs b/satrs-core/src/pus/verification.rs
index 4e3a9e3..0e81849 100644
--- a/satrs-core/src/pus/verification.rs
+++ b/satrs-core/src/pus/verification.rs
@@ -22,8 +22,8 @@
 //! use satrs_core::tmtc::tm_helper::SharedTmStore;
 //! use spacepackets::ecss::PusPacket;
 //! use spacepackets::SpHeader;
-//! use spacepackets::ecss::tc::{PusTc, PusTcSecondaryHeader};
-//! use spacepackets::ecss::tm::PusTm;
+//! use spacepackets::ecss::tc::{PusTcCreator, PusTcSecondaryHeader};
+//! use spacepackets::ecss::tm::PusTmReader;
 //!
 //! const EMPTY_STAMP: [u8; 7] = [0; 7];
 //! const TEST_APID: u16 = 0x02;
@@ -39,7 +39,7 @@
 //!
 //! let mut sph = SpHeader::tc_unseg(TEST_APID, 0, 0).unwrap();
 //! let tc_header = PusTcSecondaryHeader::new_simple(17, 1);
-//! let pus_tc_0 = PusTc::new(&mut sph, tc_header, None, true);
+//! let pus_tc_0 = PusTcCreator::new(&mut sph, tc_header, None, true);
 //! let init_token = reporter.add_tc(&pus_tc_0);
 //!
 //! // Complete success sequence for a telecommand
@@ -60,7 +60,7 @@
 //!         tm_len = slice.len();
 //!         tm_buf[0..tm_len].copy_from_slice(slice);
 //!     }
-//!     let (pus_tm, _) = PusTm::from_bytes(&tm_buf[0..tm_len], 7)
+//!     let (pus_tm, _) = PusTmReader::new(&tm_buf[0..tm_len], 7)
 //!        .expect("Error reading verification TM");
 //!     if packet_idx == 0 {
 //!         assert_eq!(pus_tm.subservice(), 1);
@@ -85,8 +85,8 @@ use core::mem::size_of;
 use delegate::delegate;
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
-use spacepackets::ecss::tc::PusTc;
-use spacepackets::ecss::tm::{PusTm, PusTmCreator, PusTmSecondaryHeader};
+use spacepackets::ecss::tc::IsPusTelecommand;
+use spacepackets::ecss::tm::{PusTmCreator, PusTmSecondaryHeader};
 use spacepackets::ecss::{EcssEnumeration, PusError, SerializablePusPacket};
 use spacepackets::{CcsdsPacket, PacketId, PacketSequenceCtrl};
 use spacepackets::{SpHeader, MAX_APID};
@@ -163,7 +163,7 @@ impl RequestId {
 }
 impl RequestId {
     /// This allows extracting the request ID from a given PUS telecommand.
-    pub fn new(tc: &PusTc) -> Self {
+    pub fn new(tc: &(impl CcsdsPacket + IsPusTelecommand)) -> Self {
         RequestId {
             version_number: tc.ccsds_version(),
             packet_id: tc.packet_id(),
@@ -436,7 +436,10 @@ impl VerificationReporterCore {
 
     /// Initialize verification handling by passing a TC reference. This returns a token required
     /// to call the acceptance functions
-    pub fn add_tc(&mut self, pus_tc: &PusTc) -> VerificationToken<TcStateNone> {
+    pub fn add_tc(
+        &mut self,
+        pus_tc: &(impl CcsdsPacket + IsPusTelecommand),
+    ) -> VerificationToken<TcStateNone> {
         self.add_tc_with_req_id(RequestId::new(pus_tc))
     }
 
@@ -888,6 +891,7 @@ mod alloc_mod {
     use alloc::boxed::Box;
     use alloc::vec;
     use alloc::vec::Vec;
+    use spacepackets::ecss::tc::IsPusTelecommand;
 
     #[derive(Clone)]
     pub struct VerificationReporterCfg {
@@ -949,7 +953,7 @@ mod alloc_mod {
             to self.reporter {
                 pub fn set_apid(&mut self, apid: u16) -> bool;
                 pub fn apid(&self) -> u16;
-                pub fn add_tc(&mut self, pus_tc: &PusTc) -> VerificationToken<TcStateNone>;
+                pub fn add_tc(&mut self, pus_tc: &(impl CcsdsPacket + IsPusTelecommand)) -> VerificationToken<TcStateNone>;
                 pub fn add_tc_with_req_id(&mut self, req_id: RequestId) -> VerificationToken<TcStateNone>;
                 pub fn dest_id(&self) -> u16;
                 pub fn set_dest_id(&mut self, dest_id: u16);
@@ -1213,7 +1217,7 @@ mod alloc_mod {
             to self.reporter {
                 pub fn set_apid(&mut self, apid: u16) -> bool;
                 pub fn apid(&self) -> u16;
-                pub fn add_tc(&mut self, pus_tc: &PusTc) -> VerificationToken<TcStateNone>;
+                pub fn add_tc(&mut self, pus_tc: &(impl CcsdsPacket + IsPusTelecommand)) -> VerificationToken<TcStateNone>;
                 pub fn add_tc_with_req_id(&mut self, req_id: RequestId) -> VerificationToken<TcStateNone>;
                 pub fn dest_id(&self) -> u16;
                 pub fn set_dest_id(&mut self, dest_id: u16);
@@ -1304,192 +1308,8 @@ mod std_mod {
     use crate::pus::verification::VerificationReporterWithSender;
     use std::sync::{Arc, Mutex};
 
-    //     use super::alloc_mod::VerificationReporterWithSender;
-    //     use super::*;
-    //     use crate::pool::{ShareablePoolProvider, SharedPool, StoreAddr};
-    //     use crate::pus::{EcssSender, MpscPusInStoreSendError, PusTmWrapper};
-    //     use crate::SenderId;
-    //     use delegate::delegate;
-    //     use spacepackets::ecss::SerializablePusPacket;
-    //     use std::sync::{mpsc, Arc, Mutex, RwLockWriteGuard};
-    //
     pub type StdVerifReporterWithSender = VerificationReporterWithSender;
     pub type SharedStdVerifReporterWithSender = Arc<Mutex<StdVerifReporterWithSender>>;
-    //
-    //     trait SendBackend: Send {
-    //         type SendError: Debug;
-    //
-    //         fn send(&self, addr: StoreAddr) -> Result<(), Self::SendError>;
-    //     }
-    //
-    //     #[derive(Clone)]
-    //     struct StdSenderBase<S> {
-    //         id: SenderId,
-    //         name: &'static str,
-    //         tm_store: SharedPool,
-    //         tx: S,
-    //         pub ignore_poison_error: bool,
-    //     }
-    //
-    //     impl<S: SendBackend> StdSenderBase<S> {
-    //         pub fn new(id: SenderId, name: &'static str, tm_store: SharedPool, tx: S) -> Self {
-    //             Self {
-    //                 id,
-    //                 name,
-    //                 tm_store,
-    //                 tx,
-    //                 ignore_poison_error: false,
-    //             }
-    //         }
-    //     }
-    //
-    //     unsafe impl<S: Sync> Sync for StdSenderBase<S> {}
-    //     unsafe impl<S: Send> Send for StdSenderBase<S> {}
-    //
-    //     impl SendBackend for mpsc::Sender<StoreAddr> {
-    //         type SendError = mpsc::SendError<StoreAddr>;
-    //
-    //         fn send(&self, addr: StoreAddr) -> Result<(), Self::SendError> {
-    //             self.send(addr)
-    //         }
-    //     }
-    //
-    //     #[derive(Clone)]
-    //     pub struct MpscVerifSender {
-    //         base: StdSenderBase<mpsc::Sender<StoreAddr>>,
-    //     }
-    //
-    //     /// Verification sender with a [mpsc::Sender] backend.
-    //     /// It implements the [EcssTmSenderCore] trait to be used as PUS Verification TM sender.
-    //     impl MpscVerifSender {
-    //         pub fn new(
-    //             id: SenderId,
-    //             name: &'static str,
-    //             tm_store: SharedPool,
-    //             tx: mpsc::Sender<StoreAddr>,
-    //         ) -> Self {
-    //             Self {
-    //                 base: StdSenderBase::new(id, name, tm_store, tx),
-    //             }
-    //         }
-    //     }
-    //
-    //     //noinspection RsTraitImplementation
-    //     impl EcssSender for MpscVerifSender {
-    //         delegate!(
-    //             to self.base {
-    //                 fn id(&self) -> SenderId;
-    //                 fn name(&self) -> &'static str;
-    //             }
-    //         );
-    //     }
-    //
-    //     //noinspection RsTraitImplementation
-    //     impl EcssTmSenderCore for MpscVerifSender {
-    //         type Error = MpscPusInStoreSendError;
-    //
-    //         delegate!(
-    //             to self.base {
-    //                 fn send_tm(&self, tm: PusTmWrapper) -> Result<(), Self::Error>;
-    //             }
-    //         );
-    //     }
-    //
-    //     impl SendBackend for crossbeam_channel::Sender<StoreAddr> {
-    //         type SendError = crossbeam_channel::SendError<StoreAddr>;
-    //
-    //         fn send(&self, addr: StoreAddr) -> Result<(), Self::SendError> {
-    //             self.send(addr)
-    //         }
-    //     }
-    //
-    //     /// Verification sender with a [crossbeam_channel::Sender] backend.
-    //     /// It implements the [EcssTmSenderCore] trait to be used as PUS Verification TM sender
-    //     #[cfg(feature = "crossbeam")]
-    //     #[derive(Clone)]
-    //     pub struct CrossbeamVerifSender {
-    //         base: StdSenderBase<crossbeam_channel::Sender<StoreAddr>>,
-    //     }
-    //
-    //     #[cfg(feature = "crossbeam")]
-    //     impl CrossbeamVerifSender {
-    //         pub fn new(
-    //             id: SenderId,
-    //             name: &'static str,
-    //             tm_store: SharedPool,
-    //             tx: crossbeam_channel::Sender<StoreAddr>,
-    //         ) -> Self {
-    //             Self {
-    //                 base: StdSenderBase::new(id, name, tm_store, tx),
-    //             }
-    //         }
-    //     }
-    //
-    //     //noinspection RsTraitImplementation
-    //     #[cfg(feature = "crossbeam")]
-    //     impl EcssSender for CrossbeamVerifSender {
-    //         delegate!(
-    //             to self.base {
-    //                 fn id(&self) -> SenderId;
-    //                 fn name(&self) -> &'static str;
-    //             }
-    //         );
-    //     }
-    //
-    //     //noinspection RsTraitImplementation
-    //     #[cfg(feature = "crossbeam")]
-    //     impl EcssTmSenderCore for CrossbeamVerifSender {
-    //         type Error = MpscPusInStoreSendError;
-    //
-    //         delegate!(
-    //             to self.base {
-    //                 fn send_tm(&mut self, tm: PusTm) -> Result<(), Self::Error>;
-    //             }
-    //         );
-    //     }
-    //
-    //     impl<S: SendBackend + Clone + 'static> EcssSender for StdSenderBase<S> {
-    //         fn id(&self) -> SenderId {
-    //             self.id
-    //         }
-    //         fn name(&self) -> &'static str {
-    //             self.name
-    //         }
-    //     }
-    //     impl<S: SendBackend + Clone + 'static> EcssTmSenderCore for StdSenderBase<S> {
-    //         type Error = MpscPusInStoreSendError;
-    //
-    //         fn send_tm(&self, tm: PusTmWrapper) -> Result<(), Self::Error> {
-    //             match tm {
-    //                 PusTmWrapper::InStore(addr) => {
-    //                     self.tx.send(addr).unwrap();
-    //                     Ok(())
-    //                 }
-    //                 PusTmWrapper::Direct(tm) => {
-    //                     let operation = |mut mg: RwLockWriteGuard<ShareablePoolProvider>| {
-    //                         let (addr, buf) = mg.free_element(tm.len_packed())?;
-    //                         tm.write_to_bytes(buf)
-    //                             .map_err(MpscPusInStoreSendError::Pus)?;
-    //                         drop(mg);
-    //                         self.tx
-    //                             .send(addr)
-    //                             .map_err(|_| MpscPusInStoreSendError::RxDisconnected(addr))?;
-    //                         Ok(())
-    //                     };
-    //                     match self.tm_store.write() {
-    //                         Ok(lock) => operation(lock),
-    //                         Err(poison_error) => {
-    //                             if self.ignore_poison_error {
-    //                                 operation(poison_error.into_inner())
-    //                             } else {
-    //                                 Err(MpscPusInStoreSendError::StoreLock)
-    //                             }
-    //                         }
-    //                     }
-    //                 }
-    //             }
-    //         }
-    //     }
 }
 
 #[cfg(test)]
@@ -1506,7 +1326,7 @@ mod tests {
     use crate::ChannelId;
     use alloc::boxed::Box;
     use alloc::format;
-    use spacepackets::ecss::tc::{PusTc, PusTcSecondaryHeader};
+    use spacepackets::ecss::tc::{PusTcCreator, PusTcSecondaryHeader};
     use spacepackets::ecss::tm::PusTm;
     use spacepackets::ecss::{EcssEnumU16, EcssEnumU32, EcssEnumU8, PusError, PusPacket};
     use spacepackets::util::UnsignedEnum;
@@ -1554,10 +1374,10 @@ mod tests {
                 }
                 PusTmWrapper::Direct(tm) => {
                     assert_eq!(PusPacket::service(&tm), 1);
-                    assert!(tm.source_data().is_some());
+                    assert!(!tm.source_data().is_empty());
                     let mut time_stamp = [0; 7];
                     time_stamp.clone_from_slice(&tm.timestamp().unwrap()[0..7]);
-                    let src_data = tm.source_data().unwrap();
+                    let src_data = tm.source_data();
                     assert!(src_data.len() >= 4);
                     let req_id =
                         RequestId::from_bytes(&src_data[0..RequestId::SIZE_AS_BYTES]).unwrap();
@@ -1581,7 +1401,7 @@ mod tests {
     struct TestBase<'a> {
         vr: VerificationReporter,
         #[allow(dead_code)]
-        tc: PusTc<'a>,
+        tc: PusTcCreator<'a>,
     }
 
     impl<'a> TestBase<'a> {
@@ -1592,7 +1412,7 @@ mod tests {
     struct TestBaseWithHelper<'a> {
         helper: VerificationReporterWithSender,
         #[allow(dead_code)]
-        tc: PusTc<'a>,
+        tc: PusTcCreator<'a>,
     }
 
     impl<'a> TestBaseWithHelper<'a> {
@@ -1606,10 +1426,10 @@ mod tests {
         VerificationReporter::new(&cfg)
     }
 
-    fn base_tc_init(app_data: Option<&[u8]>) -> (PusTc, RequestId) {
+    fn base_tc_init(app_data: Option<&[u8]>) -> (PusTcCreator, RequestId) {
         let mut sph = SpHeader::tc_unseg(TEST_APID, 0x34, 0).unwrap();
         let tc_header = PusTcSecondaryHeader::new_simple(17, 1);
-        let pus_tc = PusTc::new(&mut sph, tc_header, app_data, true);
+        let pus_tc = PusTcCreator::new(&mut sph, tc_header, app_data, true);
         let req_id = RequestId::new(&pus_tc);
         (pus_tc, req_id)
     }
@@ -2333,7 +2153,7 @@ mod tests {
 
         let mut sph = SpHeader::tc_unseg(TEST_APID, 0, 0).unwrap();
         let tc_header = PusTcSecondaryHeader::new_simple(17, 1);
-        let pus_tc_0 = PusTc::new(&mut sph, tc_header, None, true);
+        let pus_tc_0 = PusTcCreator::new(&mut sph, tc_header, None, true);
         let init_token = reporter.add_tc(&pus_tc_0);
 
         // Complete success sequence for a telecommand
diff --git a/satrs-core/src/tmtc/ccsds_distrib.rs b/satrs-core/src/tmtc/ccsds_distrib.rs
index d08604c..6392e80 100644
--- a/satrs-core/src/tmtc/ccsds_distrib.rs
+++ b/satrs-core/src/tmtc/ccsds_distrib.rs
@@ -22,7 +22,7 @@
 //! use satrs_core::tmtc::{ReceivesTc, ReceivesTcCore};
 //! use spacepackets::{CcsdsPacket, SpHeader};
 //! use spacepackets::ecss::SerializablePusPacket;
-//! use spacepackets::ecss::tc::PusTc;
+//! use spacepackets::ecss::tc::{PusTc, PusTcCreator};
 //!
 //! #[derive (Default)]
 //! struct ConcreteApidHandler {
@@ -56,7 +56,7 @@
 //!
 //! // Create and pass PUS telecommand with a valid APID
 //! let mut space_packet_header = SpHeader::tc_unseg(0x002, 0x34, 0).unwrap();
-//! let mut pus_tc = PusTc::new_simple(&mut space_packet_header, 17, 1, None, true);
+//! let mut pus_tc = PusTcCreator::new_simple(&mut space_packet_header, 17, 1, None, true);
 //! let mut test_buf: [u8; 32] = [0; 32];
 //! let mut size = pus_tc
 //!     .write_to_bytes(test_buf.as_mut_slice())
@@ -225,7 +225,7 @@ impl<E: 'static> CcsdsDistributor<E> {
 pub(crate) mod tests {
     use super::*;
     use crate::tmtc::ccsds_distrib::{CcsdsDistributor, CcsdsPacketHandler};
-    use spacepackets::ecss::tc::PusTc;
+    use spacepackets::ecss::tc::PusTcCreator;
     use spacepackets::ecss::SerializablePusPacket;
     use spacepackets::CcsdsPacket;
     use std::collections::VecDeque;
@@ -236,7 +236,7 @@ pub(crate) mod tests {
 
     pub fn generate_ping_tc(buf: &mut [u8]) -> &[u8] {
         let mut sph = SpHeader::tc_unseg(0x002, 0x34, 0).unwrap();
-        let pus_tc = PusTc::new_simple(&mut sph, 17, 1, None, true);
+        let pus_tc = PusTcCreator::new_simple(&mut sph, 17, 1, None, true);
         let size = pus_tc
             .write_to_bytes(buf)
             .expect("Error writing TC to buffer");
@@ -350,7 +350,7 @@ pub(crate) mod tests {
         };
         let mut ccsds_distrib = CcsdsDistributor::new(Box::new(apid_handler));
         let mut sph = SpHeader::tc_unseg(0x004, 0x34, 0).unwrap();
-        let pus_tc = PusTc::new_simple(&mut sph, 17, 1, None, true);
+        let pus_tc = PusTcCreator::new_simple(&mut sph, 17, 1, None, true);
         let mut test_buf: [u8; 32] = [0; 32];
         pus_tc
             .write_to_bytes(test_buf.as_mut_slice())
diff --git a/satrs-core/src/tmtc/pus_distrib.rs b/satrs-core/src/tmtc/pus_distrib.rs
index a670f96..8fabf6e 100644
--- a/satrs-core/src/tmtc/pus_distrib.rs
+++ b/satrs-core/src/tmtc/pus_distrib.rs
@@ -21,7 +21,7 @@
 //! use satrs_core::tmtc::pus_distrib::{PusDistributor, PusServiceProvider};
 //! use satrs_core::tmtc::{ReceivesTc, ReceivesTcCore};
 //! use spacepackets::SpHeader;
-//! use spacepackets::ecss::tc::PusTc;
+//! use spacepackets::ecss::tc::{PusTcCreator, PusTcReader};
 //! struct ConcretePusHandler {
 //!     handler_call_count: u32
 //! }
@@ -30,7 +30,7 @@
 //! // which is used to verify the handler was called
 //! impl PusServiceProvider for ConcretePusHandler {
 //!     type Error = ();
-//!     fn handle_pus_tc_packet(&mut self, service: u8, header: &SpHeader, pus_tc: &PusTc) -> Result<(), Self::Error> {
+//!     fn handle_pus_tc_packet(&mut self, service: u8, header: &SpHeader, pus_tc: &PusTcReader) -> Result<(), Self::Error> {
 //!         assert_eq!(service, 17);
 //!         assert_eq!(pus_tc.len_packed(), 13);
 //!         self.handler_call_count += 1;
@@ -45,7 +45,7 @@
 //!
 //! // Create and pass PUS ping telecommand with a valid APID
 //! let mut space_packet_header = SpHeader::tc_unseg(0x002, 0x34, 0).unwrap();
-//! let mut pus_tc = PusTc::new_simple(&mut space_packet_header, 17, 1, None, true);
+//! let mut pus_tc = PusTcCreator::new_simple(&mut space_packet_header, 17, 1, None, true);
 //! let mut test_buf: [u8; 32] = [0; 32];
 //! let mut size = pus_tc
 //!     .write_to_bytes(test_buf.as_mut_slice())
@@ -66,7 +66,7 @@ use crate::tmtc::{ReceivesCcsdsTc, ReceivesTcCore};
 use alloc::boxed::Box;
 use core::fmt::{Display, Formatter};
 use downcast_rs::Downcast;
-use spacepackets::ecss::tc::{PusTc, PusTcReader};
+use spacepackets::ecss::tc::PusTcReader;
 use spacepackets::ecss::{PusError, PusPacket};
 use spacepackets::SpHeader;
 #[cfg(feature = "std")]
@@ -175,7 +175,6 @@ mod tests {
     };
     use crate::tmtc::ccsds_distrib::{CcsdsDistributor, CcsdsPacketHandler};
     use alloc::vec::Vec;
-    use spacepackets::ecss::tc::PusTc;
     use spacepackets::ecss::PusError;
     use spacepackets::CcsdsPacket;
     #[cfg(feature = "std")]
@@ -200,10 +199,10 @@ mod tests {
             &mut self,
             service: u8,
             sp_header: &SpHeader,
-            pus_tc: &PusTc,
+            pus_tc: &PusTcReader,
         ) -> Result<(), Self::Error> {
             let mut vec: Vec<u8> = Vec::new();
-            pus_tc.append_to_vec(&mut vec)?;
+            vec.extend_from_slice(pus_tc.raw_data());
             Ok(self
                 .pus_queue
                 .lock()
@@ -218,10 +217,10 @@ mod tests {
             &mut self,
             service: u8,
             sp_header: &SpHeader,
-            pus_tc: &PusTc,
+            pus_tc: &PusTcReader,
         ) -> Result<(), Self::Error> {
             let mut vec: Vec<u8> = Vec::new();
-            pus_tc.append_to_vec(&mut vec)?;
+            vec.extend_from_slice(pus_tc.raw_data());
             Ok(self.pus_queue.push_back((service, sp_header.apid(), vec)))
         }
     }
diff --git a/satrs-core/src/tmtc/tm_helper.rs b/satrs-core/src/tmtc/tm_helper.rs
index 93d12c8..06ba532 100644
--- a/satrs-core/src/tmtc/tm_helper.rs
+++ b/satrs-core/src/tmtc/tm_helper.rs
@@ -1,4 +1,4 @@
-use spacepackets::ecss::tm::{PusTm, PusTmSecondaryHeader};
+use spacepackets::ecss::tm::{PusTmCreator, PusTmSecondaryHeader};
 use spacepackets::time::cds::TimeProvider;
 use spacepackets::time::TimeWriter;
 use spacepackets::SpHeader;
@@ -10,7 +10,7 @@ pub use std_mod::*;
 pub mod std_mod {
     use crate::pool::{ShareablePoolProvider, SharedPool, StoreAddr};
     use crate::pus::EcssTmtcError;
-    use spacepackets::ecss::tm::{PusTm, PusTmCreator};
+    use spacepackets::ecss::tm::PusTmCreator;
     use spacepackets::ecss::SerializablePusPacket;
     use std::sync::{Arc, RwLock};
 
@@ -61,7 +61,7 @@ impl PusTmWithCdsShortHelper {
         subservice: u8,
         source_data: Option<&'a [u8]>,
         seq_count: u16,
-    ) -> PusTm {
+    ) -> PusTmCreator {
         let time_stamp = TimeProvider::from_now_with_u16_days().unwrap();
         time_stamp.write_to_bytes(&mut self.cds_short_buf).unwrap();
         self.create_pus_tm_common(service, subservice, source_data, seq_count)
@@ -74,7 +74,7 @@ impl PusTmWithCdsShortHelper {
         source_data: Option<&'a [u8]>,
         stamper: &TimeProvider,
         seq_count: u16,
-    ) -> PusTm {
+    ) -> PusTmCreator {
         stamper.write_to_bytes(&mut self.cds_short_buf).unwrap();
         self.create_pus_tm_common(service, subservice, source_data, seq_count)
     }
@@ -85,9 +85,9 @@ impl PusTmWithCdsShortHelper {
         subservice: u8,
         source_data: Option<&'a [u8]>,
         seq_count: u16,
-    ) -> PusTm {
+    ) -> PusTmCreator {
         let mut reply_header = SpHeader::tm_unseg(self.apid, seq_count, 0).unwrap();
         let tc_header = PusTmSecondaryHeader::new_simple(service, subservice, &self.cds_short_buf);
-        PusTm::new(&mut reply_header, tc_header, source_data, true)
+        PusTmCreator::new(&mut reply_header, tc_header, source_data, true)
     }
 }
diff --git a/satrs-core/tests/pus_events.rs b/satrs-core/tests/pus_events.rs
index ff1f499..d3c32f8 100644
--- a/satrs-core/tests/pus_events.rs
+++ b/satrs-core/tests/pus_events.rs
@@ -107,8 +107,7 @@ fn test_threaded_usage() {
                     assert_eq!(tm.0.service(), 5);
                     assert_eq!(tm.0.subservice(), 1);
                     let src_data = tm.0.source_data();
-                    assert!(src_data.is_some());
-                    let src_data = src_data.unwrap();
+                    assert!(!src_data.is_empty());
                     assert_eq!(src_data.len(), 4);
                     let event =
                         EventU32::from(u32::from_be_bytes(src_data[0..4].try_into().unwrap()));
@@ -137,8 +136,7 @@ fn test_threaded_usage() {
                     assert_eq!(tm.0.service(), 5);
                     assert_eq!(tm.0.subservice(), 2);
                     let src_data = tm.0.source_data();
-                    assert!(src_data.is_some());
-                    let src_data = src_data.unwrap();
+                    assert!(!src_data.is_empty());
                     assert_eq!(src_data.len(), 12);
                     let event =
                         EventU32::from(u32::from_be_bytes(src_data[0..4].try_into().unwrap()));
diff --git a/satrs-core/tests/pus_verification.rs b/satrs-core/tests/pus_verification.rs
index 5317e4d..16b6b01 100644
--- a/satrs-core/tests/pus_verification.rs
+++ b/satrs-core/tests/pus_verification.rs
@@ -9,7 +9,7 @@ pub mod crossbeam_test {
     };
     use satrs_core::pus::MpscTmInStoreSender;
     use satrs_core::tmtc::tm_helper::SharedTmStore;
-    use spacepackets::ecss::tc::{PusTc, PusTcSecondaryHeader};
+    use spacepackets::ecss::tc::{PusTc, PusTcCreator, PusTcSecondaryHeader};
     use spacepackets::ecss::tm::PusTm;
     use spacepackets::ecss::{EcssEnumU16, EcssEnumU8, PusPacket, SerializablePusPacket};
     use spacepackets::SpHeader;
@@ -56,14 +56,14 @@ pub mod crossbeam_test {
             let mut tc_guard = shared_tc_pool_0.write().unwrap();
             let mut sph = SpHeader::tc_unseg(TEST_APID, 0, 0).unwrap();
             let tc_header = PusTcSecondaryHeader::new_simple(17, 1);
-            let pus_tc_0 = PusTc::new(&mut sph, tc_header, None, true);
+            let pus_tc_0 = PusTcCreator::new(&mut sph, tc_header, None, true);
             req_id_0 = RequestId::new(&pus_tc_0);
             let (addr, mut buf) = tc_guard.free_element(pus_tc_0.len_packed()).unwrap();
             pus_tc_0.write_to_bytes(&mut buf).unwrap();
             tx_tc_0.send(addr).unwrap();
             let mut sph = SpHeader::tc_unseg(TEST_APID, 1, 0).unwrap();
             let tc_header = PusTcSecondaryHeader::new_simple(5, 1);
-            let pus_tc_1 = PusTc::new(&mut sph, tc_header, None, true);
+            let pus_tc_1 = PusTcCreator::new(&mut sph, tc_header, None, true);
             req_id_1 = RequestId::new(&pus_tc_1);
             let (addr, mut buf) = tc_guard.free_element(pus_tc_0.len_packed()).unwrap();
             pus_tc_1.write_to_bytes(&mut buf).unwrap();
@@ -156,11 +156,9 @@ pub mod crossbeam_test {
                 }
                 let (pus_tm, _) = PusTm::from_bytes(&tm_buf[0..tm_len], 7)
                     .expect("Error reading verification TM");
-                let req_id = RequestId::from_bytes(
-                    &pus_tm.source_data().expect("Invalid TM source data")
-                        [0..RequestId::SIZE_AS_BYTES],
-                )
-                .unwrap();
+                let req_id =
+                    RequestId::from_bytes(&pus_tm.source_data()[0..RequestId::SIZE_AS_BYTES])
+                        .expect("reading request ID from PUS TM source data failed");
                 if !verif_map.contains_key(&req_id) {
                     let mut content = Vec::new();
                     content.push(pus_tm.subservice());
diff --git a/satrs-example/src/bin/simpleclient.rs b/satrs-example/src/bin/simpleclient.rs
index 9c540ee..6f6de79 100644
--- a/satrs-example/src/bin/simpleclient.rs
+++ b/satrs-example/src/bin/simpleclient.rs
@@ -1,7 +1,7 @@
 use satrs_core::pus::verification::RequestId;
+use satrs_core::spacepackets::ecss::tc::PusTcCreator;
+use satrs_core::spacepackets::ecss::tm::PusTmReader;
 use satrs_core::{
-    spacepackets::ecss::tc::PusTc,
-    spacepackets::ecss::tm::PusTm,
     spacepackets::ecss::{PusPacket, SerializablePusPacket},
     spacepackets::SpHeader,
 };
@@ -13,7 +13,7 @@ fn main() {
     let mut buf = [0; 32];
     let addr = SocketAddr::new(IpAddr::V4(OBSW_SERVER_ADDR), SERVER_PORT);
     let mut sph = SpHeader::tc_unseg(0x02, 0, 0).unwrap();
-    let pus_tc = PusTc::new_simple(&mut sph, 17, 1, None, true);
+    let pus_tc = PusTcCreator::new_simple(&mut sph, 17, 1, None, true);
     let client = UdpSocket::bind("127.0.0.1:7302").expect("Connecting to UDP server failed");
     let tc_req_id = RequestId::new(&pus_tc);
     println!("Packing and sending PUS ping command TC[17,1] with request ID {tc_req_id}");
@@ -30,14 +30,14 @@ fn main() {
         let res = client.recv(&mut buf);
         match res {
             Ok(_len) => {
-                let (pus_tm, size) = PusTm::from_bytes(&buf, 7).expect("Parsing PUS TM failed");
+                let (pus_tm, size) = PusTmReader::new(&buf, 7).expect("Parsing PUS TM failed");
                 if pus_tm.service() == 17 && pus_tm.subservice() == 2 {
                     println!("Received PUS Ping Reply TM[17,2]")
                 } else if pus_tm.service() == 1 {
-                    if pus_tm.source_data().is_none() {
+                    if pus_tm.source_data().is_empty() {
                         println!("Invalid verification TM, no source data");
                     }
-                    let src_data = pus_tm.source_data().unwrap();
+                    let src_data = pus_tm.source_data();
                     if src_data.len() < 4 {
                         println!("Invalid verification TM source data, less than 4 bytes")
                     }
diff --git a/satrs-example/src/main.rs b/satrs-example/src/main.rs
index dfc726a..8944320 100644
--- a/satrs-example/src/main.rs
+++ b/satrs-example/src/main.rs
@@ -37,12 +37,10 @@ use satrs_core::pus::verification::{
 };
 use satrs_core::pus::{MpscTcInStoreReceiver, MpscTmInStoreSender};
 use satrs_core::seq_count::{CcsdsSimpleSeqCountProvider, SequenceCountProviderCore};
-use satrs_core::spacepackets::ecss::tm::PusTmZeroCopyWriter;
+use satrs_core::spacepackets::ecss::tm::{PusTmCreator, PusTmZeroCopyWriter};
 use satrs_core::spacepackets::{
-    ecss::tm::{PusTm, PusTmSecondaryHeader},
-    time::cds::TimeProvider,
-    time::TimeWriter,
-    SequenceFlags, SpHeader,
+    ecss::tm::PusTmSecondaryHeader, time::cds::TimeProvider, time::TimeWriter, SequenceFlags,
+    SpHeader,
 };
 use satrs_core::tmtc::tm_helper::SharedTmStore;
 use satrs_core::tmtc::{AddressableId, TargetId};
@@ -415,7 +413,7 @@ fn main() {
                                             unique_id,
                                         };
                                         addressable_id.write_to_be_bytes(&mut buf).unwrap();
-                                        let pus_tm = PusTm::new(
+                                        let pus_tm = PusTmCreator::new(
                                             &mut sp_header,
                                             sec_header,
                                             Some(&buf),
diff --git a/satrs-example/src/pus/action.rs b/satrs-example/src/pus/action.rs
index 0d25934..fb386e8 100644
--- a/satrs-example/src/pus/action.rs
+++ b/satrs-example/src/pus/action.rs
@@ -50,7 +50,7 @@ impl PusService8ActionHandler {
         time_stamp: &[u8],
     ) -> Result<(), PusPacketHandlingError> {
         let user_data = tc.user_data();
-        if user_data.is_none() || user_data.unwrap().len() < 8 {
+        if user_data.len() < 8 {
             self.psb()
                 .verification_handler
                 .borrow_mut()
@@ -63,7 +63,6 @@ impl PusService8ActionHandler {
                 "Expected at least 4 bytes".into(),
             ));
         }
-        let user_data = user_data.unwrap();
         let target_id = u32::from_be_bytes(user_data[0..4].try_into().unwrap());
         let action_id = u32::from_be_bytes(user_data[4..8].try_into().unwrap());
         if let Some(sender) = self.request_handlers.get(&target_id) {
diff --git a/satrs-example/src/pus/hk.rs b/satrs-example/src/pus/hk.rs
index f455633..7697c86 100644
--- a/satrs-example/src/pus/hk.rs
+++ b/satrs-example/src/pus/hk.rs
@@ -61,8 +61,8 @@ impl PusServiceHandler for PusService3HkHandler {
         let subservice = tc.subservice();
         let mut partial_error = None;
         let time_stamp = self.psb().get_current_timestamp(&mut partial_error);
-        let user_data = tc.user_data().unwrap();
-        if tc.user_data().is_none() {
+        let user_data = tc.user_data();
+        if user_data.is_empty() {
             self.psb
                 .verification_handler
                 .borrow_mut()
diff --git a/satrs-example/src/tmtc.rs b/satrs-example/src/tmtc.rs
index bb0d07b..af3fa14 100644
--- a/satrs-example/src/tmtc.rs
+++ b/satrs-example/src/tmtc.rs
@@ -11,8 +11,8 @@ use crate::pus::{PusReceiver, PusTcMpscRouter};
 use satrs_core::pool::{SharedPool, StoreAddr, StoreError};
 use satrs_core::pus::verification::StdVerifReporterWithSender;
 use satrs_core::pus::{ReceivesEcssPusTc, TcAddrWithToken};
-use satrs_core::spacepackets::ecss::tc::{PusTc, PusTcCreator, PusTcReader};
-use satrs_core::spacepackets::ecss::{PusPacket, SerializablePusPacket};
+use satrs_core::spacepackets::ecss::tc::{PusTc, PusTcReader};
+use satrs_core::spacepackets::ecss::PusPacket;
 use satrs_core::spacepackets::SpHeader;
 use satrs_core::tmtc::tm_helper::SharedTmStore;
 use satrs_core::tmtc::{CcsdsDistributor, CcsdsError, ReceivesCcsdsTc};
@@ -53,12 +53,10 @@ pub struct TcStore {
 }
 
 impl TcStore {
-    pub fn add_pus_tc(&mut self, pus_tc: &PusTcCreator) -> Result<StoreAddr, StoreError> {
+    pub fn add_pus_tc(&mut self, pus_tc: &PusTcReader) -> Result<StoreAddr, StoreError> {
         let mut pg = self.pool.write().expect("error locking TC store");
         let (addr, buf) = pg.free_element(pus_tc.len_packed())?;
-        pus_tc
-            .write_to_bytes(buf)
-            .expect("writing PUS TC to store failed");
+        buf[0..pus_tc.len_packed()].copy_from_slice(pus_tc.raw_data());
         Ok(addr)
     }
 }