diff --git a/protocol.py b/protocol.py
index 83e761a..a25010b 100644
--- a/protocol.py
+++ b/protocol.py
@@ -53,6 +53,8 @@ class ControllerProtocol(BaseProtocol):
             logger.error(f'No sub command found')
         elif sub_command == SubCommand.REQUEST_DEVICE_INFO:
             await self._command_request_device_info(report)
+        elif sub_command == SubCommand.SET_SHIPMENT_STATE:
+            await self._command_set_shipment_state(report)
         elif sub_command == SubCommand.NOT_IMPLEMENTED:
             logger.error(f'Sub command not implemented')
 
@@ -64,10 +66,20 @@ class ControllerProtocol(BaseProtocol):
         input_report = InputReport()
         input_report.set_input_report_id(0x21)
         input_report.set_misc()
-        input_report.set_button_status()
-        input_report.set_left_analog_stick()
-        input_report.set_right_analog_stick()
-        input_report.set_vibrator_input()
+        input_report.set_ack(0x82)
+        #input_report.set_button_status()
+        #input_report.set_left_analog_stick()
+        #input_report.set_right_analog_stick()
+        #input_report.set_vibrator_input()
         input_report.sub_0x2_device_info(bd_address)
 
-        asyncio.ensure_future(self.transport.write(bytes(input_report)))
+        asyncio.ensure_future(self.transport.write(input_report))
+
+    async def _command_set_shipment_state(self, output_report):
+        input_report = InputReport()
+        input_report.set_input_report_id(0x21)
+        input_report.set_misc()
+        input_report.set_ack(0x80)
+        input_report.sub_0x8_shipment()
+
+        asyncio.ensure_future(self.transport.write(input_report))
diff --git a/report.py b/report.py
index 14d146e..c5290fd 100644
--- a/report.py
+++ b/report.py
@@ -31,8 +31,12 @@ class InputReport:
         # battery level + connection info
         self.data[3] = 0x8E
 
-        # ACK byte for subcmd reply
-        self.data[14] = 0x82
+    def set_ack(self, ack):
+        """
+        ACK byte for subcmd reply
+        TODO
+        """
+        self.data[14] = ack
 
     def set_button_status(self):
         """
@@ -86,9 +90,14 @@ class InputReport:
     def __bytes__(self):
         return bytes(self.data)
 
+    def sub_0x8_shipment(self):
+        # reply to sub command ID
+        self.data[15] = 0x08
+
 
 class SubCommand(Enum):
     REQUEST_DEVICE_INFO = auto()
+    SET_SHIPMENT_STATE = auto()
     NOT_IMPLEMENTED = auto()
 
 
@@ -100,8 +109,11 @@ class OutputReport:
 
     def get_sub_command(self):
         print('subcommand:', self.data[11])
-        if self.data[11] == 0x02:
+        sub_command_byte = self.data[11]
+        if sub_command_byte == 0x02:
             return SubCommand.REQUEST_DEVICE_INFO
+        elif sub_command_byte == 0x08:
+            return SubCommand.SET_SHIPMENT_STATE
         else:
             return None
 
diff --git a/transport.py b/transport.py
index 1c2915a..2793905 100644
--- a/transport.py
+++ b/transport.py
@@ -2,6 +2,8 @@ import asyncio
 import logging
 from typing import Any
 
+from report import InputReport
+
 logger = logging.getLogger(__name__)
 
 
@@ -18,14 +20,14 @@ class L2CAP_Transport(asyncio.Transport):
             'sockname': self._sock.getsockname()
         }
 
-        print("peer", self._sock.getpeername())
-
         self._read_thread = asyncio.ensure_future(self._read())
 
         self._is_closing = False
         self._is_reading = asyncio.Event()
         self._is_reading.set()
 
+        self._input_report_timer = 0x00
+
     async def _read(self):
         try:
             while True:
@@ -58,8 +60,18 @@ class L2CAP_Transport(asyncio.Transport):
         return super().get_write_buffer_size()
 
     async def write(self, data: Any) -> None:
-        logger.debug(f'sending "{data}"')
-        await self._loop.sock_sendall(self._sock, data)
+
+        if isinstance(data, bytes):
+            _bytes = data
+        elif isinstance(data, InputReport):
+            data.set_timer(self._input_report_timer)
+            self._input_report_timer = (self._input_report_timer + 1) % 256
+            _bytes = bytes(data)
+        else:
+            raise ValueError('data must be bytes or InputReport')
+
+        logger.debug(f'sending "{_bytes}"')
+        await self._loop.sock_sendall(self._sock, _bytes)
 
     def abort(self) -> None:
         super().abort()