diff --git a/.gitignore b/.gitignore
index 1d4e738..fa3593e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -128,4 +128,5 @@ dmypy.json
 # Pyre type checker
 .pyre/
 
-.idea/
\ No newline at end of file
+.idea/
+.envrc
\ No newline at end of file
diff --git a/trio_paho_mqtt/client.py b/trio_paho_mqtt/client.py
index 3a00b51..209c2cd 100644
--- a/trio_paho_mqtt/client.py
+++ b/trio_paho_mqtt/client.py
@@ -1,21 +1,31 @@
 #!/usr/bin/env python3
 
 import socket
+from typing import Any, AsyncGenerator, Generator, List, Optional
 
 import paho.mqtt.client as mqtt
 import trio
+from paho.mqtt.properties import Properties
+from paho.mqtt.reasoncodes import ReasonCodes
+from trio import CancelScope, MemoryReceiveChannel, MemorySendChannel
+
+# TODO
+Message = Any
 
 
 class AsyncClient:
     def __init__(
-        self, sync_client: mqtt.Client, parent_nursery: trio.Nursery, max_buffer=100
-    ):
+        self,
+        sync_client: mqtt.Client,
+        parent_nursery: trio.Nursery,
+        max_buffer: int = 100,
+    ) -> None:
         self._client = sync_client
         self._nursery = parent_nursery
 
-        self.socket = self._client.socket()
+        self.socket = self._client.socket()  # type: ignore
 
-        self._cancel_scopes = []
+        self._cancel_scopes: List[CancelScope] = []
 
         self._event_connect = trio.Event()
         self._event_large_write = trio.Event()
@@ -30,6 +40,8 @@ class AsyncClient:
         self._client.on_socket_register_write = self._on_socket_register_write
         self._client.on_socket_unregister_write = self._on_socket_unregister_write
 
+        self._msg_send_channel: MemorySendChannel[Message]
+        self._msg_receive_channel: MemoryReceiveChannel[Message]
         self._msg_send_channel, self._msg_receive_channel = trio.open_memory_channel(
             max_buffer
         )
@@ -47,25 +59,25 @@ class AsyncClient:
         self.username_pw_set = self._client.username_pw_set
         self.ws_set_options = self._client.ws_set_options
 
-    def _start_all_loop(self):
+    def _start_all_loop(self) -> "AsyncClient":
         self._nursery.start_soon(self._loop_read)
         self._nursery.start_soon(self._loop_write)
         self._nursery.start_soon(self._loop_misc)
         return self
 
-    def _stop_all_loop(self):
+    def _stop_all_loop(self) -> None:
         for cs in self._cancel_scopes:
             cs.cancel()
 
-    async def _loop_misc(self):
+    async def _loop_misc(self) -> None:
         cs = trio.CancelScope()
         self._cancel_scopes.append(cs)
         await self._event_connect.wait()
         with cs:
-            while self._client.loop_misc() == mqtt.MQTT_ERR_SUCCESS:
+            while self._client.loop_misc() == mqtt.MQTT_ERR_SUCCESS:  # type: ignore
                 await trio.sleep(1)
 
-    async def _loop_read(self):
+    async def _loop_read(self) -> None:
         cs = trio.CancelScope()
         self._cancel_scopes.append(cs)
         with cs:
@@ -74,7 +86,7 @@ class AsyncClient:
                 await trio.lowlevel.wait_readable(self.socket)
                 self._client.loop_read()
 
-    async def _loop_write(self):
+    async def _loop_write(self) -> None:
         cs = trio.CancelScope()
         self._cancel_scopes.append(cs)
         with cs:
@@ -84,15 +96,21 @@ class AsyncClient:
                 self._client.loop_write()
 
     def connect(
-        self, host, port=1883, keepalive=60, bind_address="", bind_port=0, **kwargs
-    ):
+        self,
+        host: str,
+        port: int = 1883,
+        keepalive: int = 60,
+        bind_address: str = "",
+        bind_port: int = 0,
+        **kwargs: Any
+    ) -> None:
         self._start_all_loop()
         self._client.connect(host, port, keepalive, bind_address, bind_port, **kwargs)
 
-    def _on_connect(self, client, userdata, flags, rc):
+    def _on_connect(self, client: Any, userdata: Any, flags: Any, rc: Any) -> None:
         self._event_connect.set()
 
-    async def messages(self):
+    async def messages(self) -> AsyncGenerator[Message, None]:
         self._event_should_read.set()
         cs = trio.CancelScope()
         self._cancel_scopes.append(cs)
@@ -102,7 +120,7 @@ class AsyncClient:
                 yield msg
                 self._event_should_read.set()
 
-    def _on_message(self, client, userdata, msg):
+    def _on_message(self, client: Any, userdata: Any, msg: Message) -> None:
         try:
             self._msg_send_channel.send_nowait(msg)
         except trio.WouldBlock:
@@ -114,25 +132,31 @@ class AsyncClient:
             # Stop reading until the messages are read off the mem channel
             self._event_should_read = trio.Event()
 
-    def disconnect(self, reasoncode=None, properties=None):
+    def disconnect(
+        self,
+        reasoncode: Optional[ReasonCodes] = None,
+        properties: Optional[Properties] = None,
+    ) -> None:
         self._client.disconnect(reasoncode, properties)
         self._stop_all_loop()
 
-    def _on_disconnect(self, client, userdata, rc):
+    def _on_disconnect(self, client: Any, userdata: Any, rc: Any) -> None:
         self._event_connect = trio.Event()
         self._stop_all_loop()
 
-    def _on_socket_open(self, client, userdata, sock):
+    def _on_socket_open(self, client: Any, userdata: Any, sock: Any) -> None:
         self.socket = sock
         self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 2048)
 
-    def _on_socket_close(self, client, userdata, sock):
+    def _on_socket_close(self, client: Any, userdata: Any, sock: Any) -> None:
         pass
 
-    def _on_socket_register_write(self, client, userdata, sock):
+    def _on_socket_register_write(self, client: Any, userdata: Any, sock: Any) -> None:
         # large write request - start write loop
         self._event_large_write.set()
 
-    def _on_socket_unregister_write(self, client, userdata, sock):
+    def _on_socket_unregister_write(
+        self, client: Any, userdata: Any, sock: Any
+    ) -> None:
         # finished large write - stop write loop
         self._event_large_write = trio.Event()