diff -r 09dacb61d526 -r 77b95406631e rust/hedgewars-engine-messages/src/messages.rs
--- a/rust/hedgewars-engine-messages/src/messages.rs	Thu Nov 15 15:39:59 2018 -0500
+++ b/rust/hedgewars-engine-messages/src/messages.rs	Fri Nov 16 16:32:51 2018 +0100
@@ -25,26 +25,34 @@
     TeamControlGained(String),
     TeamControlLost(String),
     TimeWrap,
+    Taunt(u8),
+    HogSay(String),
+    Heartbeat,
 }
 
 #[derive(Debug, PartialEq)]
 pub enum UnsyncedEngineMessage {
+    TeamControlGained(String),
+    TeamControlLost(String),
+}
+
+#[derive(Debug, PartialEq)]
+pub enum UnorderedEngineMessage {
     Ping,
     Pong,
-    Say(String),
-    Taunt(u8),
-    GameType(u8),
+    ChatMessage(String),
+    TeamMessage(String),
+    Error(String),
     Warning(String),
     StopSyncing,
     GameOver,
     GameInterrupted,
     GameSetupChecksum(String),
-    TeamControlGained(String),
-    TeamControlLost(String),
+    PauseToggled,
 }
-
 #[derive(Debug, PartialEq)]
 pub enum ConfigEngineMessage {
+    GameType(u8),
     ConfigRequest,
     SetAmmo(String),
     SetScript(String),
@@ -117,19 +125,140 @@
 
 #[derive(Debug, PartialEq)]
 pub enum EngineMessage {
-    Synced(SyncedEngineMessage, u32),
-    Unsynced(UnsyncedEngineMessage),
-    Config(ConfigEngineMessage),
     Unknown,
     Empty,
+    Synced(SyncedEngineMessage, u32),
+    Unsynced(UnsyncedEngineMessage),
+    Unordered(UnorderedEngineMessage),
+    Config(ConfigEngineMessage),
+}
+
+macro_rules! em {
+    [$msg: expr] => {
+        vec![($msg) as u8]
+    };
+}
+
+macro_rules! ems {
+    [$msg: expr, $param: expr] => {
+        {
+            let mut v = vec![($msg) as u8];
+            v.extend(String::into_bytes($param.to_string()).iter());
+            v
+        }
+    };
 }
 
-impl EngineMessage {
-    fn from_bytes(buf: &[u8]) -> Self {
-        unimplemented!()
+impl SyncedEngineMessage {
+    fn to_bytes(&self) -> Vec<u8> {
+        use self::KeystrokeAction::*;
+        use self::SyncedEngineMessage::*;
+        match self {
+            Left(Press) => em!['L'],
+            Left(Release) => em!['l'],
+            Right(Press) => em!['R'],
+            Right(Release) => em!['r'],
+            Up(Press) => em!['U'],
+            Up(Release) => em!['u'],
+            Down(Press) => em!['D'],
+            Down(Release) => em!['d'],
+            Precise(Press) => em!['Z'],
+            Precise(Release) => em!['z'],
+            Attack(Press) => em!['A'],
+            Attack(Release) => em!['a'],
+            NextTurn => em!['N'],
+            Switch => em!['S'],
+            Timer(t) => vec!['0' as u8 + t],
+            Slot(s) => vec!['~' as u8, *s],
+            SetWeapon(s) => vec!['~' as u8, *s],
+            Put(x, y) => unimplemented!(),
+            CursorMove(x, y) => unimplemented!(),
+            HighJump => em!['J'],
+            LongJump => em!['j'],
+            Skip => em![','],
+            TeamControlGained(str) => ems!['g', str],
+            TeamControlLost(str) => ems!['f', str],
+            Taunt(s) => vec!['t' as u8, *s],
+            HogSay(str) => ems!['h', str],
+            Heartbeat => em!['+'],
+            TimeWrap => unreachable!(),
+        }
     }
+}
 
+impl UnsyncedEngineMessage {
+    fn to_bytes(&self) -> Vec<u8> {
+        use self::UnsyncedEngineMessage::*;
+        match self {
+            TeamControlGained(str) => ems!['G', str],
+            TeamControlLost(str) => ems!['F', str],
+        }
+    }
+}
+
+impl UnorderedEngineMessage {
     fn to_bytes(&self) -> Vec<u8> {
         unimplemented!()
     }
 }
+
+impl ConfigEngineMessage {
+    fn to_bytes(&self) -> Vec<u8> {
+        unimplemented!()
+    }
+}
+
+impl EngineMessage {
+    pub const MAX_LEN: u16 = 49215;
+
+    fn to_unwrapped(&self) -> Vec<u8> {
+        use self::EngineMessage::*;
+        match self {
+            Unknown => unreachable!("you're not supposed to construct such messages"),
+            Empty => unreachable!("you're not supposed to construct such messages"),
+            Synced(SyncedEngineMessage::TimeWrap, _) => vec!['#' as u8, 0xff, 0xff],
+            Synced(msg, timestamp) => {
+                let mut v = msg.to_bytes();
+                v.push((*timestamp / 256) as u8);
+                v.push(*timestamp as u8);
+
+                v
+            }
+            Unsynced(msg) => msg.to_bytes(),
+            Unordered(msg) => msg.to_bytes(),
+            Config(msg) => msg.to_bytes(),
+        }
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let mut unwrapped = self.to_unwrapped();
+        let mut size = unwrapped.len();
+
+        if size > EngineMessage::MAX_LEN as usize - 2 {
+            size = EngineMessage::MAX_LEN as usize - 2;
+            unwrapped.truncate(size);
+        }
+
+        if size < 64 {
+            unwrapped.insert(0, size as u8);
+        } else {
+            size -= 64;
+            unwrapped.insert(0, (size / 256 + 64) as u8);
+            unwrapped.insert(1, size as u8);
+        }
+
+        unwrapped
+    }
+}
+
+#[test]
+fn message_contruction() {
+    assert_eq!(
+        EngineMessage::Synced(SyncedEngineMessage::TimeWrap, 0).to_bytes(),
+        vec![3, '#' as u8, 255, 255]
+    );
+    assert_eq!(
+        EngineMessage::Synced(SyncedEngineMessage::NextTurn, 258).to_bytes(),
+        vec![3, 'N' as u8, 1, 2]
+    );
+}