diff --git a/src/codec/rtu.rs b/src/codec/rtu.rs
index 95ff7616..8c0f551c 100644
--- a/src/codec/rtu.rs
+++ b/src/codec/rtu.rs
@@ -21,7 +21,7 @@ const MAX_FRAME_LEN: usize = 256;
 
 type DroppedBytes = SmallVec<[u8; MAX_FRAME_LEN]>;
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug)]
 pub(crate) struct FrameDecoder {
     dropped_bytes: SmallVec<[u8; MAX_FRAME_LEN]>,
 }
@@ -104,23 +104,23 @@ impl FrameDecoder {
 }
 
 #[cfg(feature = "server")]
-#[derive(Debug, Default, Eq, PartialEq)]
+#[derive(Debug, Default)]
 pub(crate) struct RequestDecoder {
     frame_decoder: FrameDecoder,
 }
 
-#[derive(Debug, Default, Eq, PartialEq)]
+#[derive(Debug, Default)]
 pub(crate) struct ResponseDecoder {
     frame_decoder: FrameDecoder,
 }
 
-#[derive(Debug, Default, Eq, PartialEq)]
+#[derive(Debug, Default)]
 pub(crate) struct ClientCodec {
     pub(crate) decoder: ResponseDecoder,
 }
 
 #[cfg(feature = "server")]
-#[derive(Debug, Default, Eq, PartialEq)]
+#[derive(Debug, Default)]
 pub(crate) struct ServerCodec {
     pub(crate) decoder: RequestDecoder,
 }
diff --git a/src/codec/tcp.rs b/src/codec/tcp.rs
index 0f86c978..7a3b1ce2 100644
--- a/src/codec/tcp.rs
+++ b/src/codec/tcp.rs
@@ -17,16 +17,16 @@ const HEADER_LEN: usize = 7;
 
 const PROTOCOL_ID: u16 = 0x0000; // TCP
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, Default)]
 pub(crate) struct AduDecoder;
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug)]
 pub(crate) struct ClientCodec {
     pub(crate) decoder: AduDecoder,
 }
 
-impl Default for ClientCodec {
-    fn default() -> Self {
+impl ClientCodec {
+    pub(crate) const fn new() -> Self {
         Self {
             decoder: AduDecoder,
         }
@@ -34,20 +34,11 @@ impl Default for ClientCodec {
 }
 
 #[cfg(feature = "server")]
-#[derive(Debug, PartialEq)]
+#[derive(Debug, Default)]
 pub(crate) struct ServerCodec {
     pub(crate) decoder: AduDecoder,
 }
 
-#[cfg(feature = "server")]
-impl Default for ServerCodec {
-    fn default() -> Self {
-        Self {
-            decoder: AduDecoder,
-        }
-    }
-}
-
 impl Decoder for AduDecoder {
     type Item = (Header, Bytes);
     type Error = Error;
@@ -185,7 +176,7 @@ mod tests {
 
         #[test]
         fn decode_header_fragment() {
-            let mut codec = ClientCodec::default();
+            let mut codec = ClientCodec::new();
             let mut buf = BytesMut::from(&[0x00, 0x11, 0x00, 0x00, 0x00, 0x00][..]);
             let res = codec.decode(&mut buf).unwrap();
             assert!(res.is_none());
@@ -194,7 +185,7 @@ mod tests {
 
         #[test]
         fn decode_partly_received_message() {
-            let mut codec = ClientCodec::default();
+            let mut codec = ClientCodec::new();
             let mut buf = BytesMut::from(
                 &[
                     TRANSACTION_ID_HI,
@@ -214,7 +205,7 @@ mod tests {
 
         #[test]
         fn decode_exception_message() {
-            let mut codec = ClientCodec::default();
+            let mut codec = ClientCodec::new();
             let mut buf = BytesMut::from(
                 &[
                     TRANSACTION_ID_HI,
@@ -243,7 +234,7 @@ mod tests {
 
         #[test]
         fn decode_with_invalid_protocol_id() {
-            let mut codec = ClientCodec::default();
+            let mut codec = ClientCodec::new();
             let mut buf = BytesMut::from(
                 &[
                     TRANSACTION_ID_HI,
@@ -263,7 +254,7 @@ mod tests {
 
         #[test]
         fn encode_read_request() {
-            let mut codec = ClientCodec::default();
+            let mut codec = ClientCodec::new();
             let mut buf = BytesMut::new();
             let req = Request::ReadInputRegisters(0x23, 5);
             let pdu = req.clone().into();
@@ -289,7 +280,7 @@ mod tests {
 
         #[test]
         fn encode_with_limited_buf_capacity() {
-            let mut codec = ClientCodec::default();
+            let mut codec = ClientCodec::new();
             let pdu = Request::ReadInputRegisters(0x23, 5).into();
             let hdr = Header {
                 transaction_id: TRANSACTION_ID,
diff --git a/src/frame/mod.rs b/src/frame/mod.rs
index 8a8e113d..336c436f 100644
--- a/src/frame/mod.rs
+++ b/src/frame/mod.rs
@@ -502,7 +502,7 @@ pub struct ExceptionResponse {
 }
 
 /// Represents a message from the client (slave) to the server (master).
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone)]
 pub(crate) struct RequestPdu<'a>(pub(crate) Request<'a>);
 
 impl<'a> From<Request<'a>> for RequestPdu<'a> {
diff --git a/src/frame/rtu.rs b/src/frame/rtu.rs
index 07b6989b..b483fd92 100644
--- a/src/frame/rtu.rs
+++ b/src/frame/rtu.rs
@@ -10,13 +10,13 @@ pub(crate) struct Header {
     pub(crate) slave_id: SlaveId,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone)]
 pub struct RequestAdu<'a> {
     pub(crate) hdr: Header,
     pub(crate) pdu: RequestPdu<'a>,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone)]
 pub(crate) struct ResponseAdu {
     pub(crate) hdr: Header,
     pub(crate) pdu: ResponsePdu,
diff --git a/src/frame/tcp.rs b/src/frame/tcp.rs
index 4c7b7f85..98b6c56e 100644
--- a/src/frame/tcp.rs
+++ b/src/frame/tcp.rs
@@ -12,13 +12,13 @@ pub(crate) struct Header {
     pub(crate) unit_id: UnitId,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone)]
 pub struct RequestAdu<'a> {
     pub(crate) hdr: Header,
     pub(crate) pdu: RequestPdu<'a>,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone)]
 pub(crate) struct ResponseAdu {
     pub(crate) hdr: Header,
     pub(crate) pdu: ResponsePdu,
diff --git a/src/service/tcp.rs b/src/service/tcp.rs
index a4a478ac..97020288 100644
--- a/src/service/tcp.rs
+++ b/src/service/tcp.rs
@@ -33,7 +33,7 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 {
     pub(crate) fn new(transport: T, slave: Slave) -> Self {
-        let framed = Framed::new(transport, codec::tcp::ClientCodec::default());
+        let framed = Framed::new(transport, codec::tcp::ClientCodec::new());
         let unit_id: UnitId = slave.into();
         let transaction_id = AtomicU16::new(INITIAL_TRANSACTION_ID);
         Self {