diff --git a/aiocraft/mc/packet.py b/aiocraft/mc/packet.py
index 1b91f03..feb110c 100644
--- a/aiocraft/mc/packet.py
+++ b/aiocraft/mc/packet.py
@@ -1,32 +1,38 @@
 import io
 import json
-from typing import Tuple, Dict
+from asyncio import Event
+from typing import Tuple, Dict, Any
 
 from .mctypes import Type, VarInt
 
 class Packet:
+	__slots__ = 'id', 'definition', 'sent', '_protocol', '_state'
+
 	id : int
-	slots : Tuple[Tuple[str, Type]]
+	definition : Tuple[Tuple[str, Type]]
+	sent : Event
+	_protocol : int
+	_state : int
 
 	_ids : Dict[int, int] # definitions are compiled at install time
-	_slots : Dict[int, Tuple[Tuple[str, Type]]] # definitions are compiled at install time
+	_definitions : Dict[int, Tuple[Tuple[str, Type]]] # definitions are compiled at install time
 
 	def __init__(self, proto:int, **kwargs):
 		self._protocol = proto
-		self.slots = self._slots[proto]
+		self.definition = self._definitions[proto]
+		self.sent = Event()
 		self.id = self._ids[proto]
-		for name, t in self.slots:
+		for name, t in self.definition:
 			setattr(self, name, t._pytype(kwargs[name]) if name in kwargs else None)
 
 	@classmethod
 	def deserialize(cls, proto:int, buffer:io.BytesIO):
-		pid = VarInt.read(buffer)
-		return cls(proto, **{ name : t.read(buffer) for (name, t) in cls._slots[proto] })
+		return cls(proto, **{ name : t.read(buffer) for (name, t) in cls._definitions[proto] })
 
 	def serialize(self) -> io.BytesIO:
 		buf = io.BytesIO()
 		VarInt.write(self.id, buf)
-		for name, t in self.slots:
+		for name, t in self.definition:
 			t.write(getattr(self, name, None), buf)
 		buf.seek(0)
 		return buf
@@ -36,22 +42,23 @@ class Packet:
 			return False
 		if self._protocol != other._protocol:
 			return False
-		for name, t in self.slots:
+		for name, t in self.definition:
 			if getattr(self, name) != getattr(other, name):
 				return False
 		return True
 
 
 	def __str__(self) -> str:
-		obj = {} # could be done with dict comp but the _ key gets put last :(
+		obj : Dict[str, Any] = {} # could be done with dict comp but the _ key gets put last :(
 		obj["_"] = self.__class__.__name__
 		obj["_proto"] = self._protocol
-		for key, t in self.slots:
+		obj["_state"] = self._state
+		for key, t in self.definition:
 			obj[key] = getattr(self, key, None)
 		return json.dumps(obj, indent=2, default=str)
 
 	def __repr__(self) -> str:
-		attrs = (f"{key}={repr(getattr(self, key, None))}" for (key, t) in self.slots)
+		attrs = (f"{key}={repr(getattr(self, key, None))}" for (key, t) in self.definition)
 		return f"{self.__class__.__name__}({self._protocol}, {', '.join(attrs)})"
 
 
diff --git a/compiler/proto.py b/compiler/proto.py
index 3e0cee9..389e1f8 100644
--- a/compiler/proto.py
+++ b/compiler/proto.py
@@ -21,15 +21,19 @@ OBJECT = """
 class {name}(Packet):
 	{fields}
 
+	_state : int = {state}
+
 	_ids : Dict[int, int] = {ids}
-	_slots : Dict[int, List[Tuple[str, Type]]] = {slots}
+	_definitions : Dict[int, List[Tuple[str, Type]]] = {slots}
 """
 
 TYPE_MAP = {
 	"varint": VarInt,
-	"u8": UnsignedShort,
-	"u16": UnsignedInt,
-	"u32": UnsignedLong,
+	"u8": Byte,
+	"i8": Byte,
+	"u16": UnsignedShort,
+	"u32": UnsignedInt,
+	"u64": UnsignedLong,
 	"i16": Short,
 	"i32": Int,
 	"i64": Long,
@@ -45,11 +49,14 @@ TYPE_MAP = {
 	"entityMetadata": EntityMetadata,
 }
 
-def mctype(name:str) -> Type:
-	if not isinstance(name, str):
-		return 	TrailingByteArray
-	if name in TYPE_MAP:
-		return TYPE_MAP[name]
+def mctype(slot_type:Any) -> Type:
+	if isinstance(slot_type, str) and slot_type in TYPE_MAP:
+		return TYPE_MAP[slot_type]
+	if isinstance(slot_type, list):
+		name = slot_type[0]
+		if name == "buffer":
+			return ByteArray
+		# TODO composite data types
 	return TrailingByteArray
 
 def snake_to_camel(name:str) -> str:
@@ -74,22 +81,25 @@ class PacketClassWriter:
 	ids   : str
 	slots : str
 	fields: str
+	state : int
 
 
-	def __init__(self, title:str, ids:str, slots:str, fields:str):
+	def __init__(self, title:str, ids:str, slots:str, fields:str, state:int):
 		self.title = title
 		self.ids = ids
 		self.slots = slots
 		self.fields = fields
+		self.state = state
 
 	def compile(self) -> str:
 		return PREFACE + \
 			IMPORTS + \
 			OBJECT.format(
 				name=self.title, 
-				ids=self.ids, 
+				ids='{\n\t\t' + ',\n\t\t'.join(self.ids) + '\n\t}\n', 
 				slots=self.slots,
 				fields=self.fields,
+				state=self.state,
 			)
 
 def _make_module(path:Path, contents:dict):
@@ -187,6 +197,8 @@ def compile():
 						"slots" : packet[1],
 					}
 
+	_STATE_MAP = {"handshaking": 0, "status":1, "login":2, "play":3}
+
 	_make_module(mc_path / 'proto', { k:"*" for k in PACKETS.keys() })
 	for state in PACKETS.keys():
 		_make_module(mc_path / f"proto/{state}", { k:"*" for k in PACKETS[state].keys() })
@@ -215,9 +227,10 @@ def compile():
 					f.write(
 						PacketClassWriter(
 							pkt["name"],
-							'{\n\t\t' + ',\n\t\t'.join(ids) + '\n\t}\n',
+							ids,
 							'{\n\t\t' + '\n\t\t'.join(slots) + '\n\t}\n',
 							'\n\t'.join(fields),
+							_STATE_MAP[state]
 						).compile()
 					)