diff --git a/muxer/mplex/constants.py b/muxer/mplex/constants.py
new file mode 100644
index 0000000..a6dfcab
--- /dev/null
+++ b/muxer/mplex/constants.py
@@ -0,0 +1,6 @@
+HEADER_TAGS = {
+    "NEW_STREAM": 0,
+    "MESSAGE": 2,
+    "CLOSE": 4,
+    "RESET": 6
+}
diff --git a/muxer/mplex/muxed_connection.py b/muxer/mplex/muxed_connection.py
index fdae239..9603ab0 100644
--- a/muxer/mplex/muxed_connection.py
+++ b/muxer/mplex/muxed_connection.py
@@ -48,7 +48,6 @@ class MuxedConn(IMuxedConn):
         self.buffers[stream_id] = bytearray()
         return stream
 
-
     def accept_stream(self):
         """
         accepts a muxed stream opened by the other end
diff --git a/muxer/mplex/muxed_connection_interface.py b/muxer/mplex/muxed_connection_interface.py
index df1694a..9aa854c 100644
--- a/muxer/mplex/muxed_connection_interface.py
+++ b/muxer/mplex/muxed_connection_interface.py
@@ -1,11 +1,18 @@
 from abc import ABC, abstractmethod
 
+
 class IMuxedConn(ABC):
     """
     reference: https://github.com/libp2p/go-stream-muxer/blob/master/muxer.go
     """
 
-    # TODO closer
+    @abstractmethod
+    def close(self):
+        """
+        close connection
+        :return: true if successful
+        """
+        pass
 
     @abstractmethod
     def is_closed(self):
diff --git a/muxer/mplex/muxed_stream.py b/muxer/mplex/muxed_stream.py
index 92624e5..a6b6cbf 100644
--- a/muxer/mplex/muxed_stream.py
+++ b/muxer/mplex/muxed_stream.py
@@ -1,34 +1,113 @@
+import asyncio
 from .muxed_stream_interface import IMuxedStream
+from .constants import HEADER_TAGS
+
 
 class MuxedStream(IMuxedStream):
     """
     reference: https://github.com/libp2p/go-mplex/blob/master/stream.go
     """
 
-    def __init__(self, protocol_id, stream_name):
-        self.protocol_id = protocol_id
-        self.name = stream_name
+    def __init__(self, stream_id, initiator, muxed_conn):
+        """
+        create new MuxedStream in muxer
+        :param stream_id: stream stream id
+        :param initiator: boolean if this is an initiator
+        :param muxed_conn: muxed connection of this muxed_stream
+        """
+        self.id = stream_id
+        self.initiator = initiator
+        self.muxed_conn = muxed_conn
+
+        # self.read_deadline = None
+        # self.write_deadline = None
+
+        self.local_closed = False
+        self.remote_closed = False
+
+    def get_flag(self, action):
+        """
+        get header flag based on action for mplex
+        :param action: action type in str
+        :return: int flag
+        """
+        if self.initiator:
+            return HEADER_TAGS[action]
+        else:
+            return HEADER_TAGS[action] - 1
 
     def read(self):
-        pass
+        """
+        read messages associated with stream from buffer til end of file
+        :return: bytes of input
+        """
+        return self.muxed_conn.read_buffer(self.id)
 
-    def write(self):
-        pass
+    def write(self, data):
+        """
+        write to stream
+        :return: number of bytes written
+        """
+        return self.muxed_conn.send_message(self.get_flag("MESSAGE"), data, self.id)
 
     def close(self):
-        pass
+        """
+        close stream
+        :return: true if successful
+        """
+
+        if self.local_closed and self.remote_closed:
+            return True
+
+        self.muxed_conn.send_message(self.get_flag("CLOSE"), None, self.id)
+        self.muxed_conn.streams.pop(self.id)
+
+        self.local_closed = True
+        self.remote_closed = True
+
+        return True
 
     def reset(self):
         """
         closes both ends of the stream
         tells this remote side to hang up
-        :return: error/exception
+        :return: true if successful
         """
+        # TODO behavior not fully understood
         pass
+        # if self.local_closed and self.remote_closed:
+        #     return True
+        #
+        # self.muxed_conn.send_message(self.get_flag("RESET"), None, self.id)
+        # self.muxed_conn.streams.pop(self.id, None)
+        #
+        # self.local_closed = True
+        # self.remote_closed = True
+        #
+        # return True
 
+    # TODO deadline not in use
     def set_deadline(self, ttl):
         """
         set deadline for muxed stream
-        :return: a new stream
+        :return: True if successful
         """
-        pass
+        self.read_deadline = ttl
+        self.write_deadline = ttl
+        return True
+
+    def set_read_deadline(self, ttl):
+        """
+        set read deadline for muxed stream
+        :return: True if successful
+        """
+        self.read_deadline = ttl
+        return True
+
+    def set_write_deadline(self, ttl):
+        """
+        set write deadline for muxed stream
+        :return: True if successful
+        """
+        self.write_deadline = ttl
+        return True
diff --git a/muxer/mplex/muxed_stream_interface.py b/muxer/mplex/muxed_stream_interface.py
index 2c9bc25..e95a2c8 100644
--- a/muxer/mplex/muxed_stream_interface.py
+++ b/muxer/mplex/muxed_stream_interface.py
@@ -1,11 +1,31 @@
 from abc import ABC, abstractmethod
-# from datetime import time
+
 
 class IMuxedStream(ABC):
 
-    # TODO Reader
-    # TODO Writer
-    # TODO Closer
+    @abstractmethod
+    def read(self):
+        """
+        read from stream
+        :return: bytes of input
+        """
+        pass
+
+    @abstractmethod
+    def write(self, _bytes):
+        """
+        write to stream
+        :return: number of bytes written
+        """
+        pass
+
+    @abstractmethod
+    def close(self):
+        """
+        close stream
+        :return: true if successful
+        """
+        pass
 
     @abstractmethod
     def reset(self):