diff --git a/satrs-minisim/Cargo.toml b/satrs-minisim/Cargo.toml
index c272fee..53910e1 100644
--- a/satrs-minisim/Cargo.toml
+++ b/satrs-minisim/Cargo.toml
@@ -6,10 +6,15 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-asynchronix = "0.2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 log = "0.4"
 
+[dependencies.asynchronix]
+version = "0.2"
+path = "../../asynchronix/asynchronix"
+# git = "https://github.com/us-irs/asynchronix.git"
+# branch = "clock-not-sendable"
+
 [dependencies.satrs]
 path = "../satrs"
diff --git a/satrs-minisim/src/main.rs b/satrs-minisim/src/main.rs
index 88d6b69..ad39ab1 100644
--- a/satrs-minisim/src/main.rs
+++ b/satrs-minisim/src/main.rs
@@ -1,6 +1,6 @@
 use asynchronix::model::{Model, Output};
-use asynchronix::simulation::{EventSlot, Mailbox, SimInit};
-use asynchronix::time::{MonotonicTime, Scheduler};
+use asynchronix::simulation::{EventSlot, Mailbox, SimInit, Simulation};
+use asynchronix::time::{MonotonicTime, Scheduler, SystemClock};
 use log::{info, warn};
 use satrs::power::{SwitchState, SwitchStateBinary};
 use serde::{Deserialize, Serialize};
@@ -8,7 +8,7 @@ use std::f64::consts::PI;
 use std::future::Future;
 use std::net::{SocketAddr, UdpSocket};
 use std::sync::{mpsc, Arc, Mutex};
-use std::time::Duration;
+use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
 use std::{io, thread};
 
 // Normally, small magnetometers generate their output as a signed 16 bit raw format or something
@@ -219,17 +219,11 @@ impl MagnetorquerModel {
 
 impl Model for MagnetorquerModel {}
 
-// A UDP server which handles all TC received by a client application.
-pub struct UdpTcServer {
-    socket: UdpSocket,
-    last_sender: Arc<Mutex<Option<SocketAddr>>>,
-}
-
 // A helper object which sends back all replies to the UDP client.
 //
 // This helper is scheduled separately to minimize the delay between the requests and replies.
 pub struct UdpTmSender {
-    reply_receiver: mpsc::Receiver<ValueReply>,
+    reply_receiver: mpsc::Receiver<SimReply>,
     last_sender: Arc<Mutex<Option<SocketAddr>>>,
 }
 
@@ -247,21 +241,30 @@ pub struct SimRequest {
 }
 
 #[derive(Serialize, Deserialize)]
-pub struct ValueReply {
+pub struct SimReply {
     device: SimDevice,
     reply: String,
 }
 
-struct ReplyHandler {
-    reply_sender: mpsc::Sender<ValueReply>,
+pub type SharedSocketAddr = Arc<Mutex<Option<SocketAddr>>>;
+
+// A UDP server which handles all TC received by a client application.
+pub struct UdpTcServer {
+    socket: UdpSocket,
+    request_sender: mpsc::Sender<SimRequest>,
+    last_sender: SharedSocketAddr,
 }
 
 impl UdpTcServer {
-    pub fn new(reply_receiver: mpsc::Receiver<ValueReply>) -> io::Result<Self> {
+    pub fn new(
+        request_sender: mpsc::Sender<SimRequest>,
+        last_sender: SharedSocketAddr,
+    ) -> io::Result<Self> {
         let socket = UdpSocket::bind("0.0.0.0:7303")?;
         Ok(Self {
             socket,
-            // reply_receiver,
+            request_sender,
+            last_sender,
         })
     }
 
@@ -288,6 +291,9 @@ impl UdpTcServer {
                 );
                 continue;
             }
+            self.request_sender.send(sim_req.unwrap()).unwrap();
+            self.last_sender.lock().unwrap().replace(src);
+            /*
             let sim_req = sim_req.unwrap();
             match sim_req.device {
                 SimDevice::Mgm => {
@@ -298,6 +304,7 @@ impl UdpTcServer {
                     self.handle_pcdu_request(&src, &sim_req);
                 }
             }
+            */
         }
     }
 
@@ -327,11 +334,23 @@ impl UdpTcServer {
     }
 }
 
+// The simulation controller processes requests and drives the simulation.
+// TODO: How do we process requests and drive the simulation at the same time?
+pub struct SimController {
+    pub request_receiver: mpsc::Receiver<SimRequest>,
+    pub simulation: Simulation,
+}
+
+impl SimController {}
+
 pub fn current_millis(time: MonotonicTime) -> u64 {
     (time.as_secs() as u64 * 1000) + (time.subsec_nanos() as u64 / 1_000_000)
 }
 
 fn main() {
+    let shared_socket_addr = SharedSocketAddr::default();
+    let (req_sender, req_receiver) = mpsc::channel();
+
     // Instantiate models and their mailboxes.
     let mut mgm_sim = MagnetometerModel::new(Duration::from_millis(50));
 
@@ -339,24 +358,19 @@ fn main() {
     let mgm_input_addr = mgm_mailbox.address();
 
     // Keep handles to the main input and output.
-    let output_slot = mgm_sim.sensor_values.connect_slot().0;
+    // let output_slot = mgm_sim.sensor_values.connect_slot().0;
     // let output_slot_2 = mgm_sim.sensor_values.connect_slot().0;
-
+    let t0 = MonotonicTime::EPOCH;
+    let clock = SystemClock::from_system_time(t0, SystemTime::now());
     // Instantiate the simulator
-    let t0 = MonotonicTime::EPOCH; // arbitrary start time
-    let mut simu = SimInit::new().add_model(mgm_sim, mgm_mailbox).init(t0);
+    let mut simu = SimInit::new()
+        .add_model(mgm_sim, mgm_mailbox)
+        .init_with_clock(t0, clock);
 
     // This thread schedules the simulator.
     let sim_thread = thread::spawn(move || {
         // The magnetometer will schedule itself at fixed intervals.
         simu.send_event(MagnetometerModel::start, (), &mgm_input_addr);
-        /*
-        for _ in 0..100 {
-            simu.step();
-            let tuple = output_slot_2.take().expect("expected output");
-            println!("output at {:?}: {tuple:?}", simu.time());
-        }
-        */
         loop {
             simu.step();
         }
@@ -364,7 +378,7 @@ fn main() {
 
     // This thread manages the simulator UDP server.
     let udp_thread = thread::spawn(move || {
-        let mut server = UdpTcServer::new(output_slot).unwrap();
+        let mut server = UdpTcServer::new(req_sender, shared_socket_addr).unwrap();
         server.run();
     });