diff --git a/fsrc-core/src/event_man.rs b/fsrc-core/src/event_man.rs
index 27d3b04..381ccd7 100644
--- a/fsrc-core/src/event_man.rs
+++ b/fsrc-core/src/event_man.rs
@@ -27,7 +27,8 @@
 //! events to package them as telemetry or start actions where applicable.
 //! Other components might only be interested in certain events. For example, a thermal system
 //! handler might only be interested in temperature events generated by a thermal sensor component.
-use crate::events::{GenericEvent, LargestEventRaw, LargestGroupIdRaw};
+use crate::events::{EventU16, EventU32, GenericEvent, LargestEventRaw, LargestGroupIdRaw};
+use crate::util::{AuxData, AuxDataHeapless};
 use alloc::boxed::Box;
 use alloc::vec;
 use alloc::vec::Vec;
@@ -43,48 +44,69 @@ enum ListenerType {
     All,
 }
 
-pub trait SendEventProvider<Provider: GenericEvent> {
+pub type EventWithHeaplessAuxData<Event> = (Event, Option<AuxDataHeapless>);
+pub type EventU32WithHeaplessAuxData = EventWithHeaplessAuxData<EventU32>;
+pub type EventU16WithHeaplessAuxData = EventWithHeaplessAuxData<EventU16>;
+
+pub type EventWithAuxData<Event> = (Event, Option<AuxData>);
+pub type EventU32WithAuxData = EventWithAuxData<EventU32>;
+pub type EventU16WithAuxData = EventWithAuxData<EventU16>;
+
+pub trait SendEventProvider<Provider: GenericEvent, AuxDataProvider = AuxData> {
     type Error;
 
     fn id(&self) -> u32;
     fn send_no_data(&mut self, event: Provider) -> Result<(), Self::Error> {
         self.send(event, None)
     }
-    fn send(&mut self, event: Provider, aux_data: Option<&[u8]>) -> Result<(), Self::Error>;
+    fn send(
+        &mut self,
+        event: Provider,
+        aux_data: Option<AuxDataProvider>,
+    ) -> Result<(), Self::Error>;
 }
 
-struct Listener<E, Event: GenericEvent> {
+struct Listener<E, Event: GenericEvent, AuxDataProvider = AuxData> {
     ltype: ListenerType,
-    send_provider: Box<dyn SendEventProvider<Event, Error = E>>,
+    send_provider: Box<dyn SendEventProvider<Event, AuxDataProvider, Error = E>>,
 }
 
 /// Generic abstraction for an event receiver.
-pub trait EventReceiver<Event: GenericEvent> {
+pub trait EventReceiver<Event: GenericEvent, AuxDataProvider = AuxData> {
     /// This function has to be provided by any event receiver. A receive call may or may not return
     /// an event.
     ///
     /// To allow returning arbitrary additional auxiliary data, a mutable slice is passed to the
     /// [Self::receive] call as well. Receivers can write data to this slice, but care must be taken
     /// to avoid panics due to size missmatches or out of bound writes.
-    fn receive(&mut self, aux_data: &mut [u8]) -> Option<Event>;
+    fn receive(&mut self) -> Option<(Event, Option<AuxDataProvider>)>;
 }
 
 /// Generic event manager implementation.
-pub struct EventManager<E, Event: GenericEvent> {
-    aux_data_buf: Vec<u8>,
-    listeners: HashMap<ListenerType, Vec<Listener<E, Event>>>,
-    event_receiver: Box<dyn EventReceiver<Event>>,
+///
+/// # Generics
+///
+///  * `SendProviderError`: [SendEventProvider] error type
+///  * `Event`: Concrete event provider, currently either [EventU32] or [EventU16]
+///  * `AuxDataProvider`: Concrete auxiliary data provder, currently either [AuxData] or
+///     [AuxDataHeapless]
+pub struct EventManager<
+    SendProviderError,
+    Event: GenericEvent = EventU32,
+    AuxDataProvider = AuxData,
+> {
+    listeners: HashMap<ListenerType, Vec<Listener<SendProviderError, Event, AuxDataProvider>>>,
+    event_receiver: Box<dyn EventReceiver<Event, AuxDataProvider>>,
 }
 
-pub enum HandlerResult<Provider: GenericEvent> {
+pub enum HandlerResult<Provider: GenericEvent, AuxDataProvider> {
     Empty,
-    Handled(u32, Provider),
+    Handled(u32, Provider, Option<AuxDataProvider>),
 }
 
 impl<E, Event: GenericEvent + Copy> EventManager<E, Event> {
-    pub fn new(event_receiver: Box<dyn EventReceiver<Event>>, buf_len_aux_data: usize) -> Self {
+    pub fn new(event_receiver: Box<dyn EventReceiver<Event>>) -> Self {
         EventManager {
-            aux_data_buf: vec![0; buf_len_aux_data],
             listeners: HashMap::new(),
             event_receiver,
         }
@@ -105,6 +127,10 @@ impl<E, Event: GenericEvent + Copy> EventManager<E, Event> {
         self.update_listeners(ListenerType::Group(group_id), dest);
     }
 
+    /// Subscribe for all events received by the manager.
+    ///
+    /// For example, this can be useful for a handler component which sends every event as
+    /// a telemetry packet.
     pub fn subscribe_all(&mut self, dest: impl SendEventProvider<Event, Error = E> + 'static) {
         self.update_listeners(ListenerType::All, dest);
     }
@@ -126,11 +152,13 @@ impl<E, Event: GenericEvent + Copy> EventManager<E, Event> {
     }
 }
 
-impl<E, Provider: GenericEvent + Copy> EventManager<E, Provider> {
+impl<E, Event: GenericEvent + Copy, AuxDataProvider: Clone>
+    EventManager<E, Event, AuxDataProvider>
+{
     fn update_listeners(
         &mut self,
         key: ListenerType,
-        dest: impl SendEventProvider<Provider, Error = E> + 'static,
+        dest: impl SendEventProvider<Event, AuxDataProvider, Error = E> + 'static,
     ) {
         if !self.listeners.contains_key(&key) {
             self.listeners.insert(
@@ -155,28 +183,27 @@ impl<E, Provider: GenericEvent + Copy> EventManager<E, Provider> {
         }
     }
 
-    pub fn try_event_handling(&mut self) -> Result<HandlerResult<Provider>, E> {
+    pub fn try_event_handling(&mut self) -> Result<HandlerResult<Event, AuxDataProvider>, E> {
         let mut err_status = None;
         let mut num_recipients = 0;
         let mut send_handler =
-            |event: Provider, aux_data: Option<&[u8]>, llist: &mut Vec<Listener<E, Provider>>| {
+            |event: Event,
+             aux_data: Option<AuxDataProvider>,
+             llist: &mut Vec<Listener<E, Event, AuxDataProvider>>| {
                 for listener in llist.iter_mut() {
-                    if let Err(e) = listener.send_provider.send(event, aux_data) {
+                    if let Err(e) = listener.send_provider.send(event, aux_data.clone()) {
                         err_status = Some(Err(e));
                     } else {
                         num_recipients += 1;
                     }
                 }
             };
-        if let Some(event) = self
-            .event_receiver
-            .receive(self.aux_data_buf.as_mut_slice())
-        {
+        if let Some((event, aux_data)) = self.event_receiver.receive() {
             let single_key = ListenerType::Single(event.raw_as_largest_type());
             if self.listeners.contains_key(&single_key) {
                 send_handler(
                     event,
-                    Some(self.aux_data_buf.as_slice()),
+                    aux_data.clone(),
                     self.listeners.get_mut(&single_key).unwrap(),
                 );
             }
@@ -184,17 +211,17 @@ impl<E, Provider: GenericEvent + Copy> EventManager<E, Provider> {
             if self.listeners.contains_key(&group_key) {
                 send_handler(
                     event,
-                    Some(self.aux_data_buf.as_slice()),
+                    aux_data.clone(),
                     self.listeners.get_mut(&group_key).unwrap(),
                 );
             }
             if let Some(all_receivers) = self.listeners.get_mut(&ListenerType::All) {
-                send_handler(event, Some(self.aux_data_buf.as_slice()), all_receivers);
+                send_handler(event, aux_data.clone(), all_receivers);
             }
             if let Some(err) = err_status {
                 return err;
             }
-            return Ok(HandlerResult::Handled(num_recipients, event));
+            return Ok(HandlerResult::Handled(num_recipients, event, aux_data));
         }
         Ok(HandlerResult::Empty)
     }
@@ -202,31 +229,26 @@ impl<E, Provider: GenericEvent + Copy> EventManager<E, Provider> {
 
 #[cfg(feature = "std")]
 pub mod stdmod {
-    use crate::event_man::EventReceiver;
+    use crate::event_man::{EventReceiver, EventWithAuxData};
     use crate::events::{EventU16, EventU32, GenericEvent};
+    use crate::util::AuxData;
     use std::sync::mpsc::Receiver;
-    use std::vec::Vec;
 
     pub struct MpscEventReceiver<Event: GenericEvent = EventU32> {
-        mpsc_receiver: Receiver<(Event, Option<Vec<u8>>)>,
+        mpsc_receiver: Receiver<(Event, Option<AuxData>)>,
     }
 
     impl<Event: GenericEvent> MpscEventReceiver<Event> {
-        pub fn new(receiver: Receiver<(Event, Option<Vec<u8>>)>) -> Self {
+        pub fn new(receiver: Receiver<(Event, Option<AuxData>)>) -> Self {
             Self {
                 mpsc_receiver: receiver,
             }
         }
     }
     impl<Event: GenericEvent> EventReceiver<Event> for MpscEventReceiver<Event> {
-        fn receive(&mut self, aux_data: &mut [u8]) -> Option<Event> {
-            if let Some((event, params)) = self.mpsc_receiver.try_recv().ok() {
-                if let Some(params) = params {
-                    if params.len() < aux_data.len() {
-                        aux_data[0..params.len()].copy_from_slice(params.as_slice())
-                    }
-                }
-                return Some(event);
+        fn receive(&mut self) -> Option<EventWithAuxData<Event>> {
+            if let Ok(event_and_data) = self.mpsc_receiver.try_recv() {
+                return Some(event_and_data);
             }
             None
         }
@@ -241,62 +263,76 @@ mod tests {
     use super::*;
     use crate::event_man::EventManager;
     use crate::events::{EventU32, GenericEvent, Severity};
+    use crate::util::AuxDataRaw;
     use alloc::boxed::Box;
+    use std::format;
     use std::sync::mpsc::{channel, Receiver, SendError, Sender};
 
-    type EventAndParams<'a> = (EventU32, Option<&'a [u8]>);
-
     #[derive(Clone)]
-    struct MpscEventSenderQueue<'a> {
+    struct MpscEventSenderQueue {
         id: u32,
-        mpsc_sender: Sender<EventAndParams<'a>>,
+        mpsc_sender: Sender<EventU32WithAuxData>,
     }
 
-    impl<'a> SendEventProvider<EventU32> for MpscEventSenderQueue<'a> {
-        type Error = SendError<EventAndParams<'a>>;
+    impl MpscEventSenderQueue {
+        fn new(id: u32, mpsc_sender: Sender<EventU32WithAuxData>) -> Self {
+            Self { id, mpsc_sender }
+        }
+    }
+
+    impl SendEventProvider<EventU32> for MpscEventSenderQueue {
+        type Error = SendError<EventU32WithAuxData>;
 
         fn id(&self) -> u32 {
             self.id
         }
-        fn send(&mut self, event: EventU32, aux_data: Option<&'a [u8]>) -> Result<(), Self::Error> {
+        fn send(&mut self, event: EventU32, aux_data: Option<AuxData>) -> Result<(), Self::Error> {
             self.mpsc_sender.send((event, aux_data))
         }
     }
 
-    fn check_next_event(expected: EventU32, receiver: &Receiver<EventAndParams>) {
-        for _ in 0..5 {
-            if let Ok(event) = receiver.try_recv() {
-                assert_eq!(event.0, expected);
-                break;
-            }
+    fn check_next_event(
+        expected: EventU32,
+        receiver: &Receiver<EventU32WithAuxData>,
+    ) -> Option<AuxData> {
+        if let Ok(event) = receiver.try_recv() {
+            assert_eq!(event.0, expected);
+            return event.1;
         }
+        None
     }
 
     fn check_handled_event(
-        res: HandlerResult<EventU32>,
+        res: HandlerResult<EventU32, AuxData>,
         expected: EventU32,
         expected_num_sent: u32,
     ) {
         assert!(matches!(res, HandlerResult::Handled { .. }));
-        if let HandlerResult::Handled(num_recipients, event) = res {
+        if let HandlerResult::Handled(num_recipients, event, _aux_data) = res {
             assert_eq!(event, expected);
             assert_eq!(num_recipients, expected_num_sent);
         }
     }
 
-    #[test]
-    fn test_basic() {
+    fn generic_event_man() -> (
+        Sender<EventU32WithAuxData>,
+        EventManager<SendError<EventU32WithAuxData>>,
+    ) {
         let (event_sender, manager_queue) = channel();
         let event_man_receiver = MpscEventReceiver::new(manager_queue);
-        let mut event_man: EventManager<SendError<EventAndParams>, EventU32> =
-            EventManager::new(Box::new(event_man_receiver), 128);
+        (
+            event_sender,
+            EventManager::new(Box::new(event_man_receiver)),
+        )
+    }
+
+    #[test]
+    fn test_basic() {
+        let (event_sender, mut event_man) = generic_event_man();
         let event_grp_0 = EventU32::new(Severity::INFO, 0, 0).unwrap();
         let event_grp_1_0 = EventU32::new(Severity::HIGH, 1, 0).unwrap();
         let (single_event_sender, single_event_receiver) = channel();
-        let single_event_listener = MpscEventSenderQueue {
-            id: 0,
-            mpsc_sender: single_event_sender,
-        };
+        let single_event_listener = MpscEventSenderQueue::new(0, single_event_sender);
         event_man.subscribe_single(event_grp_0, single_event_listener);
         let (group_event_sender_0, group_event_receiver_0) = channel();
         let group_event_listener = MpscEventSenderQueue {
@@ -324,13 +360,34 @@ mod tests {
         check_next_event(event_grp_1_0, &group_event_receiver_0);
     }
 
+    #[test]
+    fn test_with_basic_aux_data() {
+        let (event_sender, mut event_man) = generic_event_man();
+        let event_grp_0 = EventU32::new(Severity::INFO, 0, 0).unwrap();
+        let (single_event_sender, single_event_receiver) = channel();
+        let single_event_listener = MpscEventSenderQueue::new(0, single_event_sender);
+        event_man.subscribe_single(event_grp_0, single_event_listener);
+        event_sender
+            .send((event_grp_0, Some(AuxData::Heapless((2_u32, 3_u32).into()))))
+            .expect("Sending group error failed");
+        let res = event_man.try_event_handling();
+        assert!(res.is_ok());
+        check_handled_event(res.unwrap(), event_grp_0, 1);
+        let aux = check_next_event(event_grp_0, &single_event_receiver);
+        assert!(aux.is_some());
+        let aux = aux.unwrap();
+        if let AuxData::Heapless(AuxDataHeapless::Raw(AuxDataRaw::U32Pair(pair))) = aux {
+            assert_eq!(pair.0, 2);
+            assert_eq!(pair.1, 3);
+        } else {
+            panic!("{}", format!("Unexpected auxiliary value type {:?}", aux));
+        }
+    }
+
     /// Test listening for multiple groups
     #[test]
     fn test_multi_group() {
-        let (event_sender, manager_queue) = channel();
-        let event_man_receiver = MpscEventReceiver::new(manager_queue);
-        let mut event_man: EventManager<SendError<EventAndParams>, EventU32> =
-            EventManager::new(Box::new(event_man_receiver), 128);
+        let (event_sender, mut event_man) = generic_event_man();
         let res = event_man.try_event_handling();
         assert!(res.is_ok());
         let hres = res.unwrap();
@@ -367,10 +424,7 @@ mod tests {
     /// to both group and single events from one listener
     #[test]
     fn test_listening_to_same_event_and_multi_type() {
-        let (event_sender, manager_queue) = channel();
-        let event_man_receiver = MpscEventReceiver::new(manager_queue);
-        let mut event_man: EventManager<SendError<EventAndParams>, EventU32> =
-            EventManager::new(Box::new(event_man_receiver), 128);
+        let (event_sender, mut event_man) = generic_event_man();
         let event_0 = EventU32::new(Severity::INFO, 0, 5).unwrap();
         let event_1 = EventU32::new(Severity::HIGH, 1, 0).unwrap();
         let (event_0_tx_0, event_0_rx_0) = channel();
@@ -426,8 +480,8 @@ mod tests {
     fn test_all_events_listener() {
         let (event_sender, manager_queue) = channel();
         let event_man_receiver = MpscEventReceiver::new(manager_queue);
-        let mut event_man: EventManager<SendError<EventAndParams>, EventU32> =
-            EventManager::new(Box::new(event_man_receiver), 128);
+        let mut event_man: EventManager<SendError<EventU32WithAuxData>> =
+            EventManager::new(Box::new(event_man_receiver));
         let event_0 = EventU32::new(Severity::INFO, 0, 5).unwrap();
         let event_1 = EventU32::new(Severity::HIGH, 1, 0).unwrap();
         let (event_0_tx_0, all_events_rx) = channel();
diff --git a/fsrc-core/src/lib.rs b/fsrc-core/src/lib.rs
index e8349da..c5178d4 100644
--- a/fsrc-core/src/lib.rs
+++ b/fsrc-core/src/lib.rs
@@ -28,5 +28,6 @@ pub mod objects;
 pub mod pool;
 pub mod pus;
 pub mod tmtc;
+pub mod util;
 
 extern crate downcast_rs;
diff --git a/fsrc-core/src/util.rs b/fsrc-core/src/util.rs
new file mode 100644
index 0000000..ef8033c
--- /dev/null
+++ b/fsrc-core/src/util.rs
@@ -0,0 +1,97 @@
+use crate::pool::StoreAddr;
+#[cfg(feature = "alloc")]
+use alloc::string::String;
+#[cfg(feature = "alloc")]
+use alloc::string::ToString;
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+
+#[derive(Debug, Copy, Clone)]
+pub enum AuxDataRaw {
+    U8(u8),
+    U8Pair((u8, u8)),
+    U8Triplet((u8, u8, u8)),
+    I8(i8),
+    I8Pair((i8, i8)),
+    I8Triplet((i8, i8, i8)),
+    U16(u16),
+    U16Pair((u16, u16)),
+    U16Triplet((u16, u16, u16)),
+    I16(i16),
+    I16Pair((i16, i16)),
+    I16Triplet((i16, i16, i16)),
+    U32(u32),
+    U32Pair((u32, u32)),
+    U32Triplet((u32, u32, u32)),
+    I32(i32),
+    I32Tuple((i32, i32)),
+    I32Triplet((i32, i32, i32)),
+    F32(f32),
+    F32Pair((f32, f32)),
+    F32Triplet((f32, f32, f32)),
+    U64(u64),
+    F64(f64),
+}
+
+#[derive(Debug, Copy, Clone)]
+pub enum AuxDataHeapless {
+    Raw(AuxDataRaw),
+    Store(StoreAddr),
+}
+
+impl From<StoreAddr> for AuxDataHeapless {
+    fn from(x: StoreAddr) -> Self {
+        Self::Store(x)
+    }
+}
+
+impl From<(u32, u32)> for AuxDataRaw {
+    fn from(val: (u32, u32)) -> Self {
+        Self::U32Pair(val)
+    }
+}
+
+impl From<(u32, u32)> for AuxDataHeapless {
+    fn from(val: (u32, u32)) -> Self {
+        AuxDataHeapless::Raw(val.into())
+    }
+}
+
+#[cfg(feature = "alloc")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
+#[derive(Debug, Clone)]
+pub enum AuxData {
+    Heapless(AuxDataHeapless),
+    Vec(Vec<u8>),
+    String(String),
+}
+
+impl From<AuxDataHeapless> for AuxData {
+    fn from(x: AuxDataHeapless) -> Self {
+        Self::Heapless(x)
+    }
+}
+
+impl From<Vec<u8>> for AuxData {
+    fn from(val: Vec<u8>) -> Self {
+        Self::Vec(val)
+    }
+}
+
+impl From<&[u8]> for AuxData {
+    fn from(val: &[u8]) -> Self {
+        Self::Vec(val.to_vec())
+    }
+}
+
+impl From<String> for AuxData {
+    fn from(val: String) -> Self {
+        Self::String(val)
+    }
+}
+
+impl From<&str> for AuxData {
+    fn from(val: &str) -> Self {
+        Self::String(val.to_string())
+    }
+}