added tmtc test

src/interface/tcp_spp_client.rs

@@ -354,7 +354,39 @@ mod tests {
             }
             Err(())
         }
+
+        fn try_reading_one_packet(
+            &mut self,
+            stream: &mut TcpStream,
+            limit: u32,
+            read_buf: &mut [u8],
+        ) -> usize {
+            let mut read_data = 0;
+
+            for _ in 0..limit {
+                match stream.read(read_buf) {
+                    Ok(0) => {}
+                    Ok(len) => {
+                        // assert_eq!(&tm_buf, &read_buf[0..len]);
+                        // read_bufd_expected_data = true;
+                        read_data = len;
+                        break;
+                    }
+                    Err(e) => {
+                        if e.kind() == io::ErrorKind::WouldBlock {
+                            continue;
+                        }
+                        panic!("TCP server read error: {:?}", e);
+                    }
+                }
+                if read_data > 0 {
+                    break;
+                }
+            }
+            read_data
+        }
     }
+
     // This test just simplifies that the client properly connects to a server.
     #[test]
     fn basic_client_test() {
@@ -392,7 +424,6 @@ mod tests {
             .write_to_be_bytes(&mut buf)
             .expect("writing TM failed");
         let jh0 = thread::spawn(move || {
-            let mut read_expected_data = false;
             let mut read_buf: [u8; 64] = [0; 64];
             let mut stream = tcp_server
                 .attempt_connection(3)
@@ -400,27 +431,12 @@ mod tests {
             stream
                 .set_read_timeout(Some(Duration::from_millis(10)))
                 .expect("setting read timeout failed");
-            for _ in 0..5 {
+
-                match stream.read(&mut read_buf) {
+            let read_bytes = tcp_server.try_reading_one_packet(&mut stream, 5, &mut read_buf);
-                    Ok(0) => {}
+            if read_bytes == 0 {
-                    Ok(len) => {
-                        assert_eq!(&buf, &read_buf[0..len]);
-                        read_expected_data = true;
-                        break;
-                    }
-                    Err(e) => {
-                        if e.kind() == io::ErrorKind::WouldBlock {
-                            continue;
-                        }
-                        panic!("TCP server read error: {:?}", e);
-                    }
-                }
-                if read_expected_data {
-                    break;
-                }
-            }
-            if !read_expected_data {
                 panic!("did not receive expected data");
+            } else {
+                assert_eq!(&buf, &read_buf[0..read_bytes]);
             }
         });
         tm_tcp_client_tx
@@ -483,4 +499,63 @@ mod tests {
         }
         jh0.join().unwrap();
     }
+
+    // Test that the client can both read telecommands from the server and send back
+    // telemetry to the server.
+    #[test]
+    fn basic_client_tmtc_test() {
+        let (tc_source_tx, tc_source_rx) = mpsc::channel();
+        let (tm_tcp_client_tx, tm_tcp_client_rx) = mpsc::channel();
+        let mut tcp_server = TcpServerTestbench::new();
+        let local_addr = tcp_server.local_addr();
+        let mut tc_buf: [u8; 8] = [0; 8];
+        let mut tm_buf: [u8; 8] = [0; 8];
+        TEST_TC
+            .write_to_be_bytes(&mut tc_buf)
+            .expect("writing TM failed");
+        TEST_TM
+            .write_to_be_bytes(&mut tm_buf)
+            .expect("writing TM failed");
+        let jh0 = thread::spawn(move || {
+            let mut read_buf: [u8; 64] = [0; 64];
+            let mut stream = tcp_server
+                .attempt_connection(3)
+                .expect("no client connection detected");
+            stream
+                .set_read_timeout(Some(Duration::from_millis(10)))
+                .expect("setting read timeout failed");
+            stream.write_all(&tc_buf).expect("writing TC failed");
+            let read_bytes = tcp_server.try_reading_one_packet(&mut stream, 5, &mut read_buf);
+            if read_bytes == 0 {
+                panic!("did not receive expected data");
+            } else {
+                assert_eq!(&tm_buf, &read_buf[0..read_bytes]);
+            }
+        });
+        tm_tcp_client_tx
+            .send(PacketAsVec::new(0, tm_buf.to_vec()))
+            .unwrap();
+
+        let mut spp_client = TcpSppClientStd::new(
+            1,
+            tc_source_tx,
+            tm_tcp_client_rx,
+            VALID_IDS,
+            Duration::from_millis(30),
+            local_addr.port(),
+        )
+        .expect("creating TCP SPP client failed");
+        let mut received_packet = false;
+        (0..3).for_each(|_| {
+            spp_client.operation().unwrap();
+            if let Ok(packet) = tc_source_rx.try_recv() {
+                assert_eq!(packet.packet, tc_buf.to_vec());
+                received_packet = true;
+            }
+        });
+        if !received_packet {
+            panic!("did not receive expected data");
+        }
+        jh0.join().unwrap();
+    }
 }