need to think about the exchange interface again..

satrs-minisim/src/main.rs

@@ -1,12 +1,13 @@
 use asynchronix::model::{Model, Output};
 use asynchronix::simulation::{EventSlot, Mailbox, SimInit};
 use asynchronix::time::{MonotonicTime, Scheduler};
-use log::warn;
+use log::{info, warn};
 use satrs::power::{SwitchState, SwitchStateBinary};
 use serde::{Deserialize, Serialize};
 use std::f64::consts::PI;
 use std::future::Future;
-use std::net::UdpSocket;
+use std::net::{SocketAddr, UdpSocket};
+use std::sync::{mpsc, Arc, Mutex};
 use std::time::Duration;
 use std::{io, thread};
 
@@ -127,6 +128,11 @@ pub enum PcduSwitches {
     Mgt = 1,
 }
 
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+pub enum PcduRequest {
+    RequestSwitchInfo,
+}
+
 pub struct PcduModel {
     pub switcher_list: Output<Vec<SwitchStateBinary>>,
     pub mgm_switch: Output<SwitchState>,
@@ -213,29 +219,50 @@ impl MagnetorquerModel {
 
 impl Model for MagnetorquerModel {}
 
-// A UDP server which exposes all values generated by the simulator.
+// A UDP server which handles all TC received by a client application.
-pub struct UdpServer {
+pub struct UdpTcServer {
     socket: UdpSocket,
-    mgm_out: EventSlot<MgmTuple>,
+    last_sender: Arc<Mutex<Option<SocketAddr>>>,
 }
 
-#[derive(Serialize, Deserialize)]
+// A helper object which sends back all replies to the UDP client.
-pub struct ValueRequest {
+//
-    device: String,
+// This helper is scheduled separately to minimize the delay between the requests and replies.
+pub struct UdpTmSender {
+    reply_receiver: mpsc::Receiver<ValueReply>,
+    last_sender: Arc<Mutex<Option<SocketAddr>>>,
+}
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+pub enum SimDevice {
+    Mgm,
+    Mgt,
+    Pcdu,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SimRequest {
+    device: SimDevice,
+    request: String,
 }
 
 #[derive(Serialize, Deserialize)]
 pub struct ValueReply {
-    device: String,
+    device: SimDevice,
     reply: String,
 }
 
-const MGM_DEV_STR: &str = "mgm";
+struct ReplyHandler {
+    reply_sender: mpsc::Sender<ValueReply>,
+}
 
-impl UdpServer {
+impl UdpTcServer {
-    pub fn new(mgm_out: EventSlot<MgmTuple>) -> io::Result<Self> {
+    pub fn new(reply_receiver: mpsc::Receiver<ValueReply>) -> io::Result<Self> {
         let socket = UdpSocket::bind("0.0.0.0:7303")?;
-        Ok(Self { socket, mgm_out })
+        Ok(Self {
+            socket,
+            // reply_receiver,
+        })
     }
 
     pub fn run(&mut self) {
@@ -253,26 +280,49 @@ impl UdpServer {
             let req_string = std::str::from_utf8(&buffer[..bytes_read])
                 .expect("Could not write buffer as string");
             println!("Received from {}: {}", src, req_string);
-            let value_result: serde_json::Result<ValueRequest> = serde_json::from_str(req_string);
+            let sim_req: serde_json::Result<SimRequest> = serde_json::from_str(req_string);
-            match value_result {
+            if sim_req.is_err() {
-                Ok(value) => {
+                warn!(
-                    if value.device == MGM_DEV_STR {
+                    "received UDP request with invalid format: {}",
+                    sim_req.unwrap_err()
+                );
+                continue;
+            }
+            let sim_req = sim_req.unwrap();
+            match sim_req.device {
+                SimDevice::Mgm => {
+                    self.handle_mgm_request(&src, &sim_req);
+                }
+                SimDevice::Mgt => {}
+                SimDevice::Pcdu => {
+                    self.handle_pcdu_request(&src, &sim_req);
+                }
+            }
+        }
+    }
+
+    fn handle_mgm_request(&mut self, sender: &SocketAddr, sim_req: &SimRequest) {
+        /*
         let tuple = self.mgm_out.take().expect("expected output");
         let reply = ValueReply {
-                            device: MGM_DEV_STR.to_string(),
+            device: sim_req.device,
             reply: serde_json::to_string(&tuple).unwrap(),
         };
-                        let reply_string =
+        let reply_string = serde_json::to_string(&reply).expect("generating reply string failed");
-                            serde_json::to_string(&reply).expect("generating reply string failed");
         self.socket
-                            .send_to(reply_string.as_bytes(), src)
+            .send_to(reply_string.as_bytes(), sender)
             .expect("could not send data");
+        */
     }
-                }
+
-                Err(e) => {
+    fn handle_pcdu_request(&mut self, sender: &SocketAddr, sim_req: &SimRequest) {
-                    warn!("received UDP request with invalid format: {e}");
+        let pcdu_request: serde_json::Result<PcduRequest> = serde_json::from_str(&sim_req.request);
-                }
+        if pcdu_request.is_err() {
-            }
+            warn!(
+                "received invalid PCDU request: {}",
+                pcdu_request.unwrap_err()
+            );
+            return;
         }
     }
 }
@@ -314,7 +364,7 @@ fn main() {
 
     // This thread manages the simulator UDP server.
     let udp_thread = thread::spawn(move || {
-        let mut server = UdpServer::new(output_slot).unwrap();
+        let mut server = UdpTcServer::new(output_slot).unwrap();
         server.run();
     });