diff --git a/satrs/src/mode_tree.rs b/satrs/src/mode_tree.rs
index 62e622d..3da5c26 100644
--- a/satrs/src/mode_tree.rs
+++ b/satrs/src/mode_tree.rs
@@ -6,9 +6,9 @@ use crate::{
     mode::{Mode, ModeAndSubmode, ModeReply, ModeRequest, Submode},
     queue::GenericTargetedMessagingError,
     request::{
-        MessageReceiver, MessageReceiverWithId, MessageSender, MessageSenderAndReceiver,
-        MessageSenderMap, MessageSenderMapWithId, MessageWithSenderId,
-        RequestAndReplySenderAndReceiver,
+        GenericMessage, MessageReceiver, MessageReceiverWithId, MessageSender,
+        MessageSenderAndReceiver, MessageSenderMap, MessageSenderMapWithId,
+        RequestAndReplySenderAndReceiver, RequestId,
     },
     ChannelId,
 };
@@ -44,6 +44,7 @@ pub trait ModeRequestSender {
     fn local_channel_id(&self) -> ChannelId;
     fn send_mode_request(
         &self,
+        request_id: RequestId,
         target_id: ChannelId,
         request: ModeRequest,
     ) -> Result<(), GenericTargetedMessagingError>;
@@ -54,6 +55,7 @@ pub trait ModeReplySender {
 
     fn send_mode_reply(
         &self,
+        request_id: RequestId,
         target_id: ChannelId,
         reply: ModeReply,
     ) -> Result<(), GenericTargetedMessagingError>;
@@ -62,23 +64,24 @@ pub trait ModeReplySender {
 pub trait ModeRequestReceiver {
     fn try_recv_mode_request(
         &self,
-    ) -> Result<Option<MessageWithSenderId<ModeRequest>>, GenericTargetedMessagingError>;
+    ) -> Result<Option<GenericMessage<ModeRequest>>, GenericTargetedMessagingError>;
 }
 
 pub trait ModeReplyReceiver {
     fn try_recv_mode_reply(
         &self,
-    ) -> Result<Option<MessageWithSenderId<ModeReply>>, GenericTargetedMessagingError>;
+    ) -> Result<Option<GenericMessage<ModeReply>>, GenericTargetedMessagingError>;
 }
 
 impl<S: MessageSender<ModeRequest>> MessageSenderMap<ModeRequest, S> {
     pub fn send_mode_request(
         &self,
+        request_id: RequestId,
         local_id: ChannelId,
         target_id: ChannelId,
         request: ModeRequest,
     ) -> Result<(), GenericTargetedMessagingError> {
-        self.send_message(local_id, target_id, request)
+        self.send_message(request_id, local_id, target_id, request)
     }
 
     pub fn add_request_target(&mut self, target_id: ChannelId, request_sender: S) {
@@ -89,11 +92,12 @@ impl<S: MessageSender<ModeRequest>> MessageSenderMap<ModeRequest, S> {
 impl<S: MessageSender<ModeReply>> MessageSenderMap<ModeReply, S> {
     pub fn send_mode_reply(
         &self,
+        request_id: RequestId,
         local_id: ChannelId,
         target_id: ChannelId,
         request: ModeReply,
     ) -> Result<(), GenericTargetedMessagingError> {
-        self.send_message(local_id, target_id, request)
+        self.send_message(request_id, local_id, target_id, request)
     }
 
     pub fn add_reply_target(&mut self, target_id: ChannelId, request_sender: S) {
@@ -104,10 +108,11 @@ impl<S: MessageSender<ModeReply>> MessageSenderMap<ModeReply, S> {
 impl<S: MessageSender<ModeReply>> ModeReplySender for MessageSenderMapWithId<ModeReply, S> {
     fn send_mode_reply(
         &self,
+        request_id: RequestId,
         target_channel_id: ChannelId,
         reply: ModeReply,
     ) -> Result<(), GenericTargetedMessagingError> {
-        self.send_message(target_channel_id, reply)
+        self.send_message(request_id, target_channel_id, reply)
     }
 
     fn local_channel_id(&self) -> ChannelId {
@@ -122,17 +127,18 @@ impl<S: MessageSender<ModeRequest>> ModeRequestSender for MessageSenderMapWithId
 
     fn send_mode_request(
         &self,
+        request_id: RequestId,
         target_id: ChannelId,
         request: ModeRequest,
     ) -> Result<(), GenericTargetedMessagingError> {
-        self.send_message(target_id, request)
+        self.send_message(request_id, target_id, request)
     }
 }
 
 impl<R: MessageReceiver<ModeReply>> ModeReplyReceiver for MessageReceiverWithId<ModeReply, R> {
     fn try_recv_mode_reply(
         &self,
-    ) -> Result<Option<MessageWithSenderId<ModeReply>>, GenericTargetedMessagingError> {
+    ) -> Result<Option<GenericMessage<ModeReply>>, GenericTargetedMessagingError> {
         self.try_recv_message()
     }
 }
@@ -142,7 +148,7 @@ impl<R: MessageReceiver<ModeRequest>> ModeRequestReceiver
 {
     fn try_recv_mode_request(
         &self,
-    ) -> Result<Option<MessageWithSenderId<ModeRequest>>, GenericTargetedMessagingError> {
+    ) -> Result<Option<GenericMessage<ModeRequest>>, GenericTargetedMessagingError> {
         self.try_recv_message()
     }
 }
@@ -156,11 +162,16 @@ impl<FROM, S: MessageSender<ModeRequest>, R: MessageReceiver<FROM>> ModeRequestS
 
     fn send_mode_request(
         &self,
+        request_id: RequestId,
         target_id: ChannelId,
         request: ModeRequest,
     ) -> Result<(), GenericTargetedMessagingError> {
-        self.message_sender_map
-            .send_mode_request(self.local_channel_id(), target_id, request)
+        self.message_sender_map.send_mode_request(
+            request_id,
+            self.local_channel_id(),
+            target_id,
+            request,
+        )
     }
 }
 
@@ -173,11 +184,16 @@ impl<FROM, S: MessageSender<ModeReply>, R: MessageReceiver<FROM>> ModeReplySende
 
     fn send_mode_reply(
         &self,
+        request_id: RequestId,
         target_id: ChannelId,
         request: ModeReply,
     ) -> Result<(), GenericTargetedMessagingError> {
-        self.message_sender_map
-            .send_mode_reply(self.local_channel_id(), target_id, request)
+        self.message_sender_map.send_mode_reply(
+            request_id,
+            self.local_channel_id(),
+            target_id,
+            request,
+        )
     }
 }
 
@@ -186,7 +202,7 @@ impl<TO, S: MessageSender<TO>, R: MessageReceiver<ModeReply>> ModeReplyReceiver
 {
     fn try_recv_mode_reply(
         &self,
-    ) -> Result<Option<MessageWithSenderId<ModeReply>>, GenericTargetedMessagingError> {
+    ) -> Result<Option<GenericMessage<ModeReply>>, GenericTargetedMessagingError> {
         self.message_receiver
             .try_recv_message(self.local_channel_id_generic())
     }
@@ -196,7 +212,7 @@ impl<TO, S: MessageSender<TO>, R: MessageReceiver<ModeRequest>> ModeRequestRecei
 {
     fn try_recv_mode_request(
         &self,
-    ) -> Result<Option<MessageWithSenderId<ModeRequest>>, GenericTargetedMessagingError> {
+    ) -> Result<Option<GenericMessage<ModeRequest>>, GenericTargetedMessagingError> {
         self.message_receiver
             .try_recv_message(self.local_channel_id_generic())
     }
@@ -204,37 +220,37 @@ impl<TO, S: MessageSender<TO>, R: MessageReceiver<ModeRequest>> ModeRequestRecei
 
 pub type ModeRequestHandlerConnector<S, R> = MessageSenderAndReceiver<ModeReply, ModeRequest, S, R>;
 pub type MpscModeRequestHandlerConnector = ModeRequestHandlerConnector<
-    mpsc::Sender<MessageWithSenderId<ModeReply>>,
-    mpsc::Receiver<MessageWithSenderId<ModeRequest>>,
+    mpsc::Sender<GenericMessage<ModeReply>>,
+    mpsc::Receiver<GenericMessage<ModeRequest>>,
 >;
 pub type MpscBoundedModeRequestHandlerConnector = ModeRequestHandlerConnector<
-    mpsc::SyncSender<MessageWithSenderId<ModeReply>>,
-    mpsc::Receiver<MessageWithSenderId<ModeRequest>>,
+    mpsc::SyncSender<GenericMessage<ModeReply>>,
+    mpsc::Receiver<GenericMessage<ModeRequest>>,
 >;
 
 pub type ModeRequestorConnector<S, R> = MessageSenderAndReceiver<ModeRequest, ModeReply, S, R>;
 pub type MpscModeRequestorConnector = ModeRequestorConnector<
-    mpsc::Sender<MessageWithSenderId<ModeRequest>>,
-    mpsc::Receiver<MessageWithSenderId<ModeReply>>,
+    mpsc::Sender<GenericMessage<ModeRequest>>,
+    mpsc::Receiver<GenericMessage<ModeReply>>,
 >;
 pub type MpscBoundedModeRequestorConnector = ModeRequestorConnector<
-    mpsc::SyncSender<MessageWithSenderId<ModeRequest>>,
-    mpsc::Receiver<MessageWithSenderId<ModeReply>>,
+    mpsc::SyncSender<GenericMessage<ModeRequest>>,
+    mpsc::Receiver<GenericMessage<ModeReply>>,
 >;
 
 pub type ModeConnector<S0, R0, S1, R1> =
     RequestAndReplySenderAndReceiver<ModeRequest, ModeReply, S0, R0, S1, R1>;
 pub type MpscModeConnector = ModeConnector<
-    mpsc::Sender<MessageWithSenderId<ModeRequest>>,
-    mpsc::Receiver<MessageWithSenderId<ModeReply>>,
-    mpsc::Sender<MessageWithSenderId<ModeReply>>,
-    mpsc::Receiver<MessageWithSenderId<ModeRequest>>,
+    mpsc::Sender<GenericMessage<ModeRequest>>,
+    mpsc::Receiver<GenericMessage<ModeReply>>,
+    mpsc::Sender<GenericMessage<ModeReply>>,
+    mpsc::Receiver<GenericMessage<ModeRequest>>,
 >;
 pub type MpscBoundedModeConnector = ModeConnector<
-    mpsc::SyncSender<MessageWithSenderId<ModeRequest>>,
-    mpsc::Receiver<MessageWithSenderId<ModeReply>>,
-    mpsc::SyncSender<MessageWithSenderId<ModeReply>>,
-    mpsc::Receiver<MessageWithSenderId<ModeRequest>>,
+    mpsc::SyncSender<GenericMessage<ModeRequest>>,
+    mpsc::Receiver<GenericMessage<ModeReply>>,
+    mpsc::SyncSender<GenericMessage<ModeReply>>,
+    mpsc::Receiver<GenericMessage<ModeRequest>>,
 >;
 
 impl<
@@ -279,11 +295,16 @@ impl<
 
     fn send_mode_request(
         &self,
+        request_id: RequestId,
         target_id: ChannelId,
         request: ModeRequest,
     ) -> Result<(), GenericTargetedMessagingError> {
-        self.request_sender_map
-            .send_mode_request(self.local_channel_id(), target_id, request)
+        self.request_sender_map.send_mode_request(
+            request_id,
+            self.local_channel_id(),
+            target_id,
+            request,
+        )
     }
 }
 
@@ -301,11 +322,16 @@ impl<
 
     fn send_mode_reply(
         &self,
+        request_id: RequestId,
         target_id: ChannelId,
         request: ModeReply,
     ) -> Result<(), GenericTargetedMessagingError> {
-        self.reply_sender_map
-            .send_mode_reply(self.local_channel_id(), target_id, request)
+        self.reply_sender_map.send_mode_reply(
+            request_id,
+            self.local_channel_id(),
+            target_id,
+            request,
+        )
     }
 }
 
@@ -319,7 +345,7 @@ impl<
 {
     fn try_recv_mode_reply(
         &self,
-    ) -> Result<Option<MessageWithSenderId<ModeReply>>, GenericTargetedMessagingError> {
+    ) -> Result<Option<GenericMessage<ModeReply>>, GenericTargetedMessagingError> {
         self.reply_receiver
             .try_recv_message(self.local_channel_id_generic())
     }
@@ -335,7 +361,7 @@ impl<
 {
     fn try_recv_mode_request(
         &self,
-    ) -> Result<Option<MessageWithSenderId<ModeRequest>>, GenericTargetedMessagingError> {
+    ) -> Result<Option<GenericMessage<ModeRequest>>, GenericTargetedMessagingError> {
         self.request_receiver
             .try_recv_message(self.local_channel_id_generic())
     }
@@ -357,9 +383,14 @@ impl From<GenericTargetedMessagingError> for ModeError {
 }
 
 pub trait ModeRequestHandler: ModeProvider {
-    fn start_transition(&mut self, mode_and_submode: ModeAndSubmode) -> Result<(), ModeError>;
+    fn start_transition(
+        &mut self,
+        request_id: RequestId,
+        sender_id: ChannelId,
+        mode_and_submode: ModeAndSubmode,
+    ) -> Result<(), ModeError>;
 
-    fn announce_mode(&self, recursive: bool);
+    fn announce_mode(&self, request_id: RequestId, sender_id: ChannelId, recursive: bool);
     fn handle_mode_reached(&mut self) -> Result<(), GenericTargetedMessagingError>;
 }
 
diff --git a/satrs/src/request.rs b/satrs/src/request.rs
index d552446..438cc25 100644
--- a/satrs/src/request.rs
+++ b/satrs/src/request.rs
@@ -118,25 +118,32 @@ impl fmt::Display for TargetAndApidId {
     }
 }
 
-pub struct MessageWithSenderId<MSG> {
+/// Generic message type which is associated with a sender using a [ChannelId] and associated
+/// with a request using a [RequestId].
+pub struct GenericMessage<MSG> {
     pub sender_id: ChannelId,
+    pub request_id: RequestId,
     pub message: MSG,
 }
 
-impl<MSG> MessageWithSenderId<MSG> {
-    pub fn new(sender_id: ChannelId, message: MSG) -> Self {
-        Self { sender_id, message }
+impl<MSG> GenericMessage<MSG> {
+    pub fn new(request_id: RequestId, sender_id: ChannelId, message: MSG) -> Self {
+        Self {
+            request_id,
+            sender_id,
+            message,
+        }
     }
 }
 
 /// Generic trait for objects which can send targeted messages.
 pub trait MessageSender<MSG>: Send {
-    fn send(&self, message: MessageWithSenderId<MSG>) -> Result<(), GenericTargetedMessagingError>;
+    fn send(&self, message: GenericMessage<MSG>) -> Result<(), GenericTargetedMessagingError>;
 }
 
 // Generic trait for objects which can receive targeted messages.
 pub trait MessageReceiver<MSG> {
-    fn try_recv(&self) -> Result<Option<MessageWithSenderId<MSG>>, GenericTargetedMessagingError>;
+    fn try_recv(&self) -> Result<Option<GenericMessage<MSG>>, GenericTargetedMessagingError>;
 }
 
 #[cfg(feature = "std")]
@@ -152,23 +159,17 @@ mod std_mod {
         ChannelId,
     };
 
-    use super::{MessageReceiver, MessageSender, MessageWithSenderId};
+    use super::{GenericMessage, MessageReceiver, MessageSender, RequestId};
 
-    impl<MSG: Send> MessageSender<MSG> for mpsc::Sender<MessageWithSenderId<MSG>> {
-        fn send(
-            &self,
-            message: MessageWithSenderId<MSG>,
-        ) -> Result<(), GenericTargetedMessagingError> {
+    impl<MSG: Send> MessageSender<MSG> for mpsc::Sender<GenericMessage<MSG>> {
+        fn send(&self, message: GenericMessage<MSG>) -> Result<(), GenericTargetedMessagingError> {
             self.send(message)
                 .map_err(|_| GenericSendError::RxDisconnected)?;
             Ok(())
         }
     }
-    impl<MSG: Send> MessageSender<MSG> for mpsc::SyncSender<MessageWithSenderId<MSG>> {
-        fn send(
-            &self,
-            message: MessageWithSenderId<MSG>,
-        ) -> Result<(), GenericTargetedMessagingError> {
+    impl<MSG: Send> MessageSender<MSG> for mpsc::SyncSender<GenericMessage<MSG>> {
+        fn send(&self, message: GenericMessage<MSG>) -> Result<(), GenericTargetedMessagingError> {
             if let Err(e) = self.try_send(message) {
                 match e {
                     mpsc::TrySendError::Full(_) => {
@@ -202,6 +203,7 @@ mod std_mod {
 
         pub fn send_message(
             &self,
+            request_id: RequestId,
             local_channel_id: ChannelId,
             target_channel_id: ChannelId,
             message: MSG,
@@ -210,7 +212,7 @@ mod std_mod {
                 self.0
                     .get(&target_channel_id)
                     .unwrap()
-                    .send(MessageWithSenderId::new(local_channel_id, message))
+                    .send(GenericMessage::new(request_id, local_channel_id, message))
                     .map_err(|_| GenericSendError::RxDisconnected)?;
                 return Ok(());
             }
@@ -233,11 +235,16 @@ mod std_mod {
 
         pub fn send_message(
             &self,
+            request_id: RequestId,
             target_channel_id: ChannelId,
             message: MSG,
         ) -> Result<(), GenericTargetedMessagingError> {
-            self.message_sender_map
-                .send_message(self.local_channel_id, target_channel_id, message)
+            self.message_sender_map.send_message(
+                request_id,
+                self.local_channel_id,
+                target_channel_id,
+                message,
+            )
         }
 
         pub fn add_message_target(&mut self, target_id: ChannelId, message_sender: S) {
@@ -246,10 +253,8 @@ mod std_mod {
         }
     }
 
-    impl<MSG> MessageReceiver<MSG> for mpsc::Receiver<MessageWithSenderId<MSG>> {
-        fn try_recv(
-            &self,
-        ) -> Result<Option<MessageWithSenderId<MSG>>, GenericTargetedMessagingError> {
+    impl<MSG> MessageReceiver<MSG> for mpsc::Receiver<GenericMessage<MSG>> {
+        fn try_recv(&self) -> Result<Option<GenericMessage<MSG>>, GenericTargetedMessagingError> {
             match self.try_recv() {
                 Ok(msg) => Ok(Some(msg)),
                 Err(e) => match e {
@@ -274,7 +279,7 @@ mod std_mod {
         pub fn try_recv_message(
             &self,
             _local_id: ChannelId,
-        ) -> Result<Option<MessageWithSenderId<MSG>>, GenericTargetedMessagingError> {
+        ) -> Result<Option<GenericMessage<MSG>>, GenericTargetedMessagingError> {
             self.0.try_recv()
         }
     }
@@ -305,7 +310,7 @@ mod std_mod {
     impl<MSG, R: MessageReceiver<MSG>> MessageReceiverWithId<MSG, R> {
         pub fn try_recv_message(
             &self,
-        ) -> Result<Option<MessageWithSenderId<MSG>>, GenericTargetedMessagingError> {
+        ) -> Result<Option<GenericMessage<MSG>>, GenericTargetedMessagingError> {
             self.reply_receiver.0.try_recv()
         }
     }
diff --git a/satrs/tests/mode_tree.rs b/satrs/tests/mode_tree.rs
index 3c8680f..a66b774 100644
--- a/satrs/tests/mode_tree.rs
+++ b/satrs/tests/mode_tree.rs
@@ -1,6 +1,8 @@
+use core::cell::Cell;
 use std::{println, sync::mpsc};
 
 use satrs::mode_tree::ModeRequestSender;
+use satrs::request::RequestId;
 use satrs::{
     mode::{ModeAndSubmode, ModeReply, ModeRequest},
     mode_tree::{
@@ -9,7 +11,7 @@ use satrs::{
         MpscBoundedModeRequestorConnector,
     },
     queue::GenericTargetedMessagingError,
-    request::MessageWithSenderId,
+    request::GenericMessage,
     ChannelId,
 };
 use std::string::{String, ToString};
@@ -22,6 +24,7 @@ pub enum TestChannelId {
 }
 
 struct PusModeService {
+    pub request_id_counter: Cell<u32>,
     pub mode_node: MpscBoundedModeRequestorConnector,
 }
 
@@ -29,10 +32,13 @@ impl PusModeService {
     pub fn send_announce_mode_cmd_to_assy(&self) {
         self.mode_node
             .send_mode_request(
+                self.request_id_counter.get(),
                 TestChannelId::Assembly as u32,
                 ModeRequest::AnnounceModeRecursive,
             )
             .unwrap();
+        self.request_id_counter
+            .replace(self.request_id_counter.get() + 1);
     }
 }
 
@@ -40,7 +46,7 @@ struct TestDevice {
     pub name: String,
     pub mode_node: MpscBoundedModeRequestHandlerConnector,
     pub mode_and_submode: ModeAndSubmode,
-    pub mode_req_commander: Option<ChannelId>,
+    pub mode_requestor_info: Option<(RequestId, ChannelId)>,
 }
 
 impl TestDevice {
@@ -49,21 +55,27 @@ impl TestDevice {
     }
 
     pub fn check_mode_requests(&mut self) -> Result<(), GenericTargetedMessagingError> {
-        if let Some(request_and_id) = self.mode_node.try_recv_mode_request()? {
-            match request_and_id.message {
+        if let Some(request) = self.mode_node.try_recv_mode_request()? {
+            match request.message {
                 ModeRequest::SetMode(mode_and_submode) => {
-                    self.start_transition(mode_and_submode).unwrap();
-                    self.mode_req_commander = Some(request_and_id.sender_id);
+                    self.start_transition(request.request_id, request.sender_id, mode_and_submode)
+                        .unwrap();
+                    self.mode_requestor_info = Some((request.request_id, request.sender_id));
                 }
                 ModeRequest::ReadMode => self
                     .mode_node
                     .send_mode_reply(
-                        request_and_id.sender_id,
+                        request.request_id,
+                        request.sender_id,
                         ModeReply::ModeReply(self.mode_and_submode),
                     )
                     .unwrap(),
-                ModeRequest::AnnounceMode => self.announce_mode(false),
-                ModeRequest::AnnounceModeRecursive => self.announce_mode(true),
+                ModeRequest::AnnounceMode => {
+                    self.announce_mode(request.request_id, request.sender_id, false)
+                }
+                ModeRequest::AnnounceModeRecursive => {
+                    self.announce_mode(request.request_id, request.sender_id, true)
+                }
             }
         }
         Ok(())
@@ -76,13 +88,18 @@ impl ModeProvider for TestDevice {
     }
 }
 impl ModeRequestHandler for TestDevice {
-    fn start_transition(&mut self, mode_and_submode: ModeAndSubmode) -> Result<(), ModeError> {
+    fn start_transition(
+        &mut self,
+        _request_id: RequestId,
+        _sender_id: ChannelId,
+        mode_and_submode: ModeAndSubmode,
+    ) -> Result<(), ModeError> {
         self.mode_and_submode = mode_and_submode;
         self.handle_mode_reached()?;
         Ok(())
     }
 
-    fn announce_mode(&self, _recursive: bool) {
+    fn announce_mode(&self, _request_id: RequestId, _sender_id: ChannelId, _recursive: bool) {
         println!(
             "{}: announcing mode: {:?}",
             self.name, self.mode_and_submode
@@ -90,8 +107,10 @@ impl ModeRequestHandler for TestDevice {
     }
 
     fn handle_mode_reached(&mut self) -> Result<(), GenericTargetedMessagingError> {
+        let (req_id, sender_id) = self.mode_requestor_info.unwrap();
         self.mode_node.send_mode_reply(
-            self.mode_req_commander.unwrap(),
+            req_id,
+            sender_id,
             ModeReply::ModeReply(self.mode_and_submode),
         )?;
         Ok(())
@@ -100,7 +119,7 @@ impl ModeRequestHandler for TestDevice {
 
 struct TestAssembly {
     pub mode_node: MpscBoundedModeConnector,
-    pub mode_req_commander: Option<ChannelId>,
+    pub mode_requestor_info: Option<(RequestId, ChannelId)>,
     pub mode_and_submode: ModeAndSubmode,
     pub target_mode_and_submode: Option<ModeAndSubmode>,
 }
@@ -118,21 +137,26 @@ impl TestAssembly {
     }
 
     pub fn check_mode_requests(&mut self) -> Result<(), GenericTargetedMessagingError> {
-        if let Some(request_and_id) = self.mode_node.try_recv_mode_request()? {
-            match request_and_id.message {
+        if let Some(request) = self.mode_node.try_recv_mode_request()? {
+            match request.message {
                 ModeRequest::SetMode(mode_and_submode) => {
-                    self.start_transition(mode_and_submode).unwrap();
-                    self.mode_req_commander = Some(request_and_id.sender_id);
+                    self.start_transition(request.request_id, request.sender_id, mode_and_submode)
+                        .unwrap();
                 }
                 ModeRequest::ReadMode => self
                     .mode_node
                     .send_mode_reply(
-                        request_and_id.sender_id,
+                        request.request_id,
+                        request.sender_id,
                         ModeReply::ModeReply(self.mode_and_submode),
                     )
                     .unwrap(),
-                ModeRequest::AnnounceMode => self.announce_mode(false),
-                ModeRequest::AnnounceModeRecursive => self.announce_mode(true),
+                ModeRequest::AnnounceMode => {
+                    self.announce_mode(request.request_id, request.sender_id, false)
+                }
+                ModeRequest::AnnounceModeRecursive => {
+                    self.announce_mode(request.request_id, request.sender_id, true)
+                }
             }
         }
         Ok(())
@@ -162,16 +186,23 @@ impl TestAssembly {
 }
 
 impl ModeRequestHandler for TestAssembly {
-    fn start_transition(&mut self, mode_and_submode: ModeAndSubmode) -> Result<(), ModeError> {
+    fn start_transition(
+        &mut self,
+        request_id: RequestId,
+        sender_id: ChannelId,
+        mode_and_submode: ModeAndSubmode,
+    ) -> Result<(), ModeError> {
+        self.mode_requestor_info = Some((request_id, sender_id));
         self.target_mode_and_submode = Some(mode_and_submode);
         Ok(())
     }
 
-    fn announce_mode(&self, recursive: bool) {
+    fn announce_mode(&self, request_id: RequestId, _sender_id: ChannelId, recursive: bool) {
         println!(
             "TestAssembly: Announcing mode (recursively: {}): {:?}",
             recursive, self.mode_and_submode
         );
+        // self.mode_requestor_info = Some((request_id, sender_id));
         let mut mode_request = ModeRequest::AnnounceMode;
         if recursive {
             mode_request = ModeRequest::AnnounceModeRecursive;
@@ -182,7 +213,8 @@ impl ModeRequestHandler for TestAssembly {
             .iter()
             .for_each(|(_, sender)| {
                 sender
-                    .send(MessageWithSenderId::new(
+                    .send(GenericMessage::new(
+                        request_id,
                         self.mode_node.local_channel_id_generic(),
                         mode_request,
                     ))
@@ -191,8 +223,10 @@ impl ModeRequestHandler for TestAssembly {
     }
 
     fn handle_mode_reached(&mut self) -> Result<(), GenericTargetedMessagingError> {
+        let (req_id, sender_id) = self.mode_requestor_info.unwrap();
         self.mode_node.send_mode_reply(
-            self.mode_req_commander.unwrap(),
+            req_id,
+            sender_id,
             ModeReply::ModeReply(self.mode_and_submode),
         )?;
         Ok(())
@@ -260,22 +294,23 @@ fn main() {
     let mut device1 = TestDevice {
         name: "Test Device 1".to_string(),
         mode_node: mode_node_dev1,
-        mode_req_commander: None,
+        mode_requestor_info: None,
         mode_and_submode: ModeAndSubmode::new(0, 0),
     };
     let mut device2 = TestDevice {
         name: "Test Device 2".to_string(),
         mode_node: mode_node_dev2,
-        mode_req_commander: None,
+        mode_requestor_info: None,
         mode_and_submode: ModeAndSubmode::new(0, 0),
     };
     let mut assy = TestAssembly {
         mode_node: mode_node_assy,
-        mode_req_commander: None,
+        mode_requestor_info: None,
         mode_and_submode: ModeAndSubmode::new(0, 0),
         target_mode_and_submode: None,
     };
     let pus_service = PusModeService {
+        request_id_counter: Cell::new(0),
         mode_node: mode_node_pus,
     };