diff --git a/Cargo.lock b/Cargo.lock
index 1f97d578..176655b5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -635,7 +635,7 @@ dependencies = [
  "gstreamer-sys",
  "libc",
  "muldiv",
- "num-rational",
+ "num-rational 0.3.2",
  "once_cell",
  "paste",
  "pretty-hex",
@@ -1223,7 +1223,9 @@ dependencies = [
  "hyper-proxy",
  "librespot-protocol",
  "log",
+ "num",
  "num-bigint",
+ "num-derive",
  "num-integer",
  "num-traits",
  "once_cell",
@@ -1475,6 +1477,20 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "num"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43db66d1170d347f9a065114077f7dccb00c1b9478c89384490a3425279a4606"
+dependencies = [
+ "num-bigint",
+ "num-complex",
+ "num-integer",
+ "num-iter",
+ "num-rational 0.4.0",
+ "num-traits",
+]
+
 [[package]]
 name = "num-bigint"
 version = "0.4.0"
@@ -1487,6 +1503,15 @@ dependencies = [
  "rand",
 ]
 
+[[package]]
+name = "num-complex"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26873667bbbb7c5182d4a37c1add32cdf09f841af72da53318fdb81543c15085"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "num-derive"
 version = "0.3.3"
@@ -1508,6 +1533,17 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-iter"
+version = "0.1.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2021c8337a54d21aca0d59a92577a029af9431cb59b909b03252b9c164fad59"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-rational"
 version = "0.3.2"
@@ -1519,6 +1555,18 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-rational"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d41702bd167c2df5520b384281bc111a4b5efcf7fbc4c9c222c815b07e0a6a6a"
+dependencies = [
+ "autocfg",
+ "num-bigint",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.14"
diff --git a/audio/src/fetch/receive.rs b/audio/src/fetch/receive.rs
index 0f056c96..304c0e79 100644
--- a/audio/src/fetch/receive.rs
+++ b/audio/src/fetch/receive.rs
@@ -7,6 +7,7 @@ use byteorder::{BigEndian, WriteBytesExt};
 use bytes::Bytes;
 use futures_util::StreamExt;
 use librespot_core::channel::{Channel, ChannelData};
+use librespot_core::packet::PacketType;
 use librespot_core::session::Session;
 use librespot_core::spotify_id::FileId;
 use tempfile::NamedTempFile;
@@ -46,7 +47,7 @@ pub fn request_range(session: &Session, file: FileId, offset: usize, length: usi
     data.write_u32::<BigEndian>(start as u32).unwrap();
     data.write_u32::<BigEndian>(end as u32).unwrap();
 
-    session.send_packet(0x8, data);
+    session.send_packet(PacketType::StreamChunk, data);
 
     channel
 }
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 7eb4051c..3c239034 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -26,7 +26,9 @@ http = "0.2"
 hyper = { version = "0.14", features = ["client", "tcp", "http1"] }
 hyper-proxy = { version = "0.9.1", default-features = false }
 log = "0.4"
+num = "0.4"
 num-bigint = { version = "0.4", features = ["rand"] }
+num-derive = "0.3"
 num-integer = "0.1"
 num-traits = "0.2"
 once_cell = "1.5.2"
diff --git a/core/src/audio_key.rs b/core/src/audio_key.rs
index 3bce1c73..aae268e6 100644
--- a/core/src/audio_key.rs
+++ b/core/src/audio_key.rs
@@ -4,6 +4,7 @@ use std::collections::HashMap;
 use std::io::Write;
 use tokio::sync::oneshot;
 
+use crate::packet::PacketType;
 use crate::spotify_id::{FileId, SpotifyId};
 use crate::util::SeqGenerator;
 
@@ -21,19 +22,19 @@ component! {
 }
 
 impl AudioKeyManager {
-    pub(crate) fn dispatch(&self, cmd: u8, mut data: Bytes) {
+    pub(crate) fn dispatch(&self, cmd: PacketType, mut data: Bytes) {
         let seq = BigEndian::read_u32(data.split_to(4).as_ref());
 
         let sender = self.lock(|inner| inner.pending.remove(&seq));
 
         if let Some(sender) = sender {
             match cmd {
-                0xd => {
+                PacketType::AesKey => {
                     let mut key = [0u8; 16];
                     key.copy_from_slice(data.as_ref());
                     let _ = sender.send(Ok(AudioKey(key)));
                 }
-                0xe => {
+                PacketType::AesKeyError => {
                     warn!(
                         "error audio key {:x} {:x}",
                         data.as_ref()[0],
@@ -66,6 +67,6 @@ impl AudioKeyManager {
         data.write_u32::<BigEndian>(seq).unwrap();
         data.write_u16::<BigEndian>(0x0000).unwrap();
 
-        self.session().send_packet(0xc, data)
+        self.session().send_packet(PacketType::RequestKey, data)
     }
 }
diff --git a/core/src/channel.rs b/core/src/channel.rs
index 4a78a4aa..4461612e 100644
--- a/core/src/channel.rs
+++ b/core/src/channel.rs
@@ -8,8 +8,10 @@ use bytes::Bytes;
 use futures_core::Stream;
 use futures_util::lock::BiLock;
 use futures_util::{ready, StreamExt};
+use num_traits::FromPrimitive;
 use tokio::sync::mpsc;
 
+use crate::packet::PacketType;
 use crate::util::SeqGenerator;
 
 component! {
@@ -66,7 +68,7 @@ impl ChannelManager {
         (seq, channel)
     }
 
-    pub(crate) fn dispatch(&self, cmd: u8, mut data: Bytes) {
+    pub(crate) fn dispatch(&self, cmd: PacketType, mut data: Bytes) {
         use std::collections::hash_map::Entry;
 
         let id: u16 = BigEndian::read_u16(data.split_to(2).as_ref());
@@ -87,7 +89,7 @@ impl ChannelManager {
             inner.download_measurement_bytes += data.len();
 
             if let Entry::Occupied(entry) = inner.channels.entry(id) {
-                let _ = entry.get().send((cmd, data));
+                let _ = entry.get().send((cmd as u8, data));
             }
         });
     }
@@ -109,7 +111,8 @@ impl Channel {
     fn recv_packet(&mut self, cx: &mut Context<'_>) -> Poll<Result<Bytes, ChannelError>> {
         let (cmd, packet) = ready!(self.receiver.poll_recv(cx)).ok_or(ChannelError)?;
 
-        if cmd == 0xa {
+        let packet_type = FromPrimitive::from_u8(cmd);
+        if let Some(PacketType::ChannelError) = packet_type {
             let code = BigEndian::read_u16(&packet.as_ref()[..2]);
             error!("channel error: {} {}", packet.len(), code);
 
diff --git a/core/src/connection/mod.rs b/core/src/connection/mod.rs
index bacdc653..472109e6 100644
--- a/core/src/connection/mod.rs
+++ b/core/src/connection/mod.rs
@@ -7,6 +7,7 @@ pub use self::handshake::handshake;
 use std::io::{self, ErrorKind};
 
 use futures_util::{SinkExt, StreamExt};
+use num_traits::FromPrimitive;
 use protobuf::{self, Message, ProtobufError};
 use thiserror::Error;
 use tokio::net::TcpStream;
@@ -14,6 +15,7 @@ use tokio_util::codec::Framed;
 use url::Url;
 
 use crate::authentication::Credentials;
+use crate::packet::PacketType;
 use crate::protocol::keyexchange::{APLoginFailed, ErrorCode};
 use crate::version;
 
@@ -95,13 +97,14 @@ pub async fn authenticate(
         .set_device_id(device_id.to_string());
     packet.set_version_string(version::VERSION_STRING.to_string());
 
-    let cmd = 0xab;
+    let cmd = PacketType::Login;
     let data = packet.write_to_bytes().unwrap();
 
-    transport.send((cmd, data)).await?;
+    transport.send((cmd as u8, data)).await?;
     let (cmd, data) = transport.next().await.expect("EOF")?;
-    match cmd {
-        0xac => {
+    let packet_type = FromPrimitive::from_u8(cmd);
+    match packet_type {
+        Some(PacketType::APWelcome) => {
             let welcome_data = APWelcome::parse_from_bytes(data.as_ref())?;
 
             let reusable_credentials = Credentials {
@@ -112,7 +115,7 @@ pub async fn authenticate(
 
             Ok(reusable_credentials)
         }
-        0xad => {
+        Some(PacketType::AuthFailure) => {
             let error_data = APLoginFailed::parse_from_bytes(data.as_ref())?;
             Err(error_data.into())
         }
diff --git a/core/src/lib.rs b/core/src/lib.rs
index 32ee0013..b0996993 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -2,6 +2,7 @@
 
 #[macro_use]
 extern crate log;
+extern crate num_derive;
 
 use librespot_protocol as protocol;
 
@@ -21,6 +22,7 @@ mod dealer;
 pub mod diffie_hellman;
 mod http_client;
 pub mod mercury;
+pub mod packet;
 mod proxytunnel;
 pub mod session;
 mod socket;
diff --git a/core/src/mercury/mod.rs b/core/src/mercury/mod.rs
index 57650087..6cf3519e 100644
--- a/core/src/mercury/mod.rs
+++ b/core/src/mercury/mod.rs
@@ -11,6 +11,7 @@ use futures_util::FutureExt;
 use protobuf::Message;
 use tokio::sync::{mpsc, oneshot};
 
+use crate::packet::PacketType;
 use crate::protocol;
 use crate::util::SeqGenerator;
 
@@ -143,7 +144,7 @@ impl MercuryManager {
         }
     }
 
-    pub(crate) fn dispatch(&self, cmd: u8, mut data: Bytes) {
+    pub(crate) fn dispatch(&self, cmd: PacketType, mut data: Bytes) {
         let seq_len = BigEndian::read_u16(data.split_to(2).as_ref()) as usize;
         let seq = data.split_to(seq_len).as_ref().to_owned();
 
@@ -154,14 +155,17 @@ impl MercuryManager {
 
         let mut pending = match pending {
             Some(pending) => pending,
-            None if cmd == 0xb5 => MercuryPending {
-                parts: Vec::new(),
-                partial: None,
-                callback: None,
-            },
             None => {
-                warn!("Ignore seq {:?} cmd {:x}", seq, cmd);
-                return;
+                if let PacketType::MercuryEvent = cmd {
+                    MercuryPending {
+                        parts: Vec::new(),
+                        partial: None,
+                        callback: None,
+                    }
+                } else {
+                    warn!("Ignore seq {:?} cmd {:x}", seq, cmd as u8);
+                    return;
+                }
             }
         };
 
@@ -191,7 +195,7 @@ impl MercuryManager {
         data.split_to(size).as_ref().to_owned()
     }
 
-    fn complete_request(&self, cmd: u8, mut pending: MercuryPending) {
+    fn complete_request(&self, cmd: PacketType, mut pending: MercuryPending) {
         let header_data = pending.parts.remove(0);
         let header = protocol::mercury::Header::parse_from_bytes(&header_data).unwrap();
 
@@ -208,7 +212,7 @@ impl MercuryManager {
             if let Some(cb) = pending.callback {
                 let _ = cb.send(Err(MercuryError));
             }
-        } else if cmd == 0xb5 {
+        } else if let PacketType::MercuryEvent = cmd {
             self.lock(|inner| {
                 let mut found = false;
 
diff --git a/core/src/mercury/types.rs b/core/src/mercury/types.rs
index 402a954c..616225db 100644
--- a/core/src/mercury/types.rs
+++ b/core/src/mercury/types.rs
@@ -2,6 +2,7 @@ use byteorder::{BigEndian, WriteBytesExt};
 use protobuf::Message;
 use std::io::Write;
 
+use crate::packet::PacketType;
 use crate::protocol;
 
 #[derive(Debug, PartialEq, Eq)]
@@ -43,11 +44,12 @@ impl ToString for MercuryMethod {
 }
 
 impl MercuryMethod {
-    pub fn command(&self) -> u8 {
+    pub fn command(&self) -> PacketType {
+        use PacketType::*;
         match *self {
-            MercuryMethod::Get | MercuryMethod::Send => 0xb2,
-            MercuryMethod::Sub => 0xb3,
-            MercuryMethod::Unsub => 0xb4,
+            MercuryMethod::Get | MercuryMethod::Send => MercuryReq,
+            MercuryMethod::Sub => MercurySub,
+            MercuryMethod::Unsub => MercuryUnsub,
         }
     }
 }
diff --git a/core/src/packet.rs b/core/src/packet.rs
new file mode 100644
index 00000000..81645145
--- /dev/null
+++ b/core/src/packet.rs
@@ -0,0 +1,37 @@
+// Ported from librespot-java. Relicensed under MIT with permission.
+
+use num_derive::{FromPrimitive, ToPrimitive};
+
+#[derive(Debug, FromPrimitive, ToPrimitive)]
+pub enum PacketType {
+    SecretBlock = 0x02,
+    Ping = 0x04,
+    StreamChunk = 0x08,
+    StreamChunkRes = 0x09,
+    ChannelError = 0x0a,
+    ChannelAbort = 0x0b,
+    RequestKey = 0x0c,
+    AesKey = 0x0d,
+    AesKeyError = 0x0e,
+    Image = 0x19,
+    CountryCode = 0x1b,
+    Pong = 0x49,
+    PongAck = 0x4a,
+    Pause = 0x4b,
+    ProductInfo = 0x50,
+    LegacyWelcome = 0x69,
+    LicenseVersion = 0x76,
+    Login = 0xab,
+    APWelcome = 0xac,
+    AuthFailure = 0xad,
+    MercuryReq = 0xb2,
+    MercurySub = 0xb3,
+    MercuryUnsub = 0xb4,
+    MercuryEvent = 0xb5,
+    TrackEndedTime = 0x82,
+    UnknownDataAllZeros = 0x1f,
+    PreferredLocale = 0x74,
+    Unknown0x4f = 0x4f,
+    Unknown0x0f = 0x0f,
+    Unknown0x10 = 0x10,
+}
diff --git a/core/src/session.rs b/core/src/session.rs
index 2f6e5703..1bf62aa2 100644
--- a/core/src/session.rs
+++ b/core/src/session.rs
@@ -11,6 +11,7 @@ use byteorder::{BigEndian, ByteOrder};
 use bytes::Bytes;
 use futures_core::TryStream;
 use futures_util::{future, ready, StreamExt, TryStreamExt};
+use num_traits::FromPrimitive;
 use once_cell::sync::OnceCell;
 use thiserror::Error;
 use tokio::sync::mpsc;
@@ -25,6 +26,7 @@ use crate::config::SessionConfig;
 use crate::connection::{self, AuthenticationError};
 use crate::http_client::HttpClient;
 use crate::mercury::MercuryManager;
+use crate::packet::PacketType;
 use crate::token::TokenProvider;
 
 #[derive(Debug, Error)]
@@ -184,11 +186,11 @@ impl Session {
         );
     }
 
-    #[allow(clippy::match_same_arms)]
     fn dispatch(&self, cmd: u8, data: Bytes) {
-        match cmd {
-            // TODO: add command types
-            0x4 => {
+        use PacketType::*;
+        let packet_type = FromPrimitive::from_u8(cmd);
+        match packet_type {
+            Some(Ping) => {
                 let server_timestamp = BigEndian::read_u32(data.as_ref()) as i64;
                 let timestamp = match SystemTime::now().duration_since(UNIX_EPOCH) {
                     Ok(dur) => dur,
@@ -199,24 +201,36 @@ impl Session {
                 self.0.data.write().unwrap().time_delta = server_timestamp - timestamp;
 
                 self.debug_info();
-                self.send_packet(0x49, vec![0, 0, 0, 0]);
+                self.send_packet(Pong, vec![0, 0, 0, 0]);
             }
-            0x4a => (),
-            0x1b => {
+            Some(PongAck) => {}
+            Some(CountryCode) => {
                 let country = String::from_utf8(data.as_ref().to_owned()).unwrap();
                 info!("Country: {:?}", country);
                 self.0.data.write().unwrap().country = country;
             }
 
-            0x9 | 0xa => self.channel().dispatch(cmd, data),
-            0xd | 0xe => self.audio_key().dispatch(cmd, data),
-            0xb2..=0xb6 => self.mercury().dispatch(cmd, data),
-            _ => (),
+            Some(StreamChunkRes) | Some(ChannelError) => {
+                self.channel().dispatch(packet_type.unwrap(), data)
+            }
+            Some(AesKey) | Some(AesKeyError) => {
+                self.audio_key().dispatch(packet_type.unwrap(), data)
+            }
+            Some(MercuryReq) | Some(MercurySub) | Some(MercuryUnsub) | Some(MercuryEvent) => {
+                self.mercury().dispatch(packet_type.unwrap(), data)
+            }
+            _ => {
+                if let Some(packet_type) = PacketType::from_u8(cmd) {
+                    trace!("Ignoring {:?} packet", packet_type);
+                } else {
+                    trace!("Ignoring unknown packet {:x}", cmd);
+                }
+            }
         }
     }
 
-    pub fn send_packet(&self, cmd: u8, data: Vec<u8>) {
-        self.0.tx_connection.send((cmd, data)).unwrap();
+    pub fn send_packet(&self, cmd: PacketType, data: Vec<u8>) {
+        self.0.tx_connection.send((cmd as u8, data)).unwrap();
     }
 
     pub fn cache(&self) -> Option<&Arc<Cache>> {
diff --git a/metadata/src/cover.rs b/metadata/src/cover.rs
index 408e658e..b483f454 100644
--- a/metadata/src/cover.rs
+++ b/metadata/src/cover.rs
@@ -2,6 +2,7 @@ use byteorder::{BigEndian, WriteBytesExt};
 use std::io::Write;
 
 use librespot_core::channel::ChannelData;
+use librespot_core::packet::PacketType;
 use librespot_core::session::Session;
 use librespot_core::spotify_id::FileId;
 
@@ -13,7 +14,7 @@ pub fn get(session: &Session, file: FileId) -> ChannelData {
     packet.write_u16::<BigEndian>(channel_id).unwrap();
     packet.write_u16::<BigEndian>(0).unwrap();
     packet.write(&file.0).unwrap();
-    session.send_packet(0x19, packet);
+    session.send_packet(PacketType::Image, packet);
 
     data
 }