adds command registration

common/src/udp.rs

@@ -1,4 +1,5 @@
 use crate::command::{Command, CommandHeader};
+use crate::udp::UdpRecvPostcardError::ExtraData;
 use crate::udp::UdpSendPostcardError::LengthMismatch;
 use log::error;
 use serde::{Deserialize, Serialize};
@@ -12,6 +13,8 @@ pub enum UdpRecvPostcardError {
     Io(#[from] std::io::Error),
     #[error("Deserialization Error")]
     Deserialization(#[from] postcard::Error),
+    #[error("Extra Data")]
+    ExtraData { amount: usize },
     #[error("No Data")]
     NoData,
 }
@@ -66,8 +69,13 @@ impl UdpSocketExt for UdpSocket {
         buffer: &'de mut [u8],
     ) -> Result<(T, SocketAddr), UdpRecvPostcardError> {
         match self.recv_from(buffer) {
-            Ok((size, addr)) => match postcard::from_bytes::<T>(&buffer[..size]) {
-                Ok(res) => Ok((res, addr)),
+            Ok((size, addr)) => match postcard::take_from_bytes::<T>(&buffer[..size]) {
+                Ok((res, rem)) => {
+                    if !rem.is_empty() {
+                        return Err(ExtraData { amount: rem.len() });
+                    }
+                    Ok((res, addr))
+                }
                 Err(err) => Err(err.into()),
             },
             Err(err) => match err.kind() {