diff --git a/stock_vertical_lift_kardex/__manifest__.py b/stock_vertical_lift_kardex/__manifest__.py
index 35670055d..8ccd05222 100644
--- a/stock_vertical_lift_kardex/__manifest__.py
+++ b/stock_vertical_lift_kardex/__manifest__.py
@@ -11,7 +11,8 @@
         'stock_vertical_lift',
     ],
     'website': 'https://www.camptocamp.com',
-    'data': [],
+    'data': [
+    ],
     'installable': True,
     'development_status': 'Alpha',
 }
diff --git a/stock_vertical_lift_kardex/models/__init__.py b/stock_vertical_lift_kardex/models/__init__.py
index 51a3830f6..5a191bac8 100644
--- a/stock_vertical_lift_kardex/models/__init__.py
+++ b/stock_vertical_lift_kardex/models/__init__.py
@@ -1,2 +1,3 @@
 from . import stock_location
 from . import vertical_lift_shuttle
+
diff --git a/stock_vertical_lift_kardex/models/stock_location.py b/stock_vertical_lift_kardex/models/stock_location.py
index e307aa21c..39d66fc28 100644
--- a/stock_vertical_lift_kardex/models/stock_location.py
+++ b/stock_vertical_lift_kardex/models/stock_location.py
@@ -28,10 +28,10 @@ class StockLocation(models.Model):
             x, y = '', ''
         subst = {
             'code': code,
-            'hostId': 'odoo',
+            'hostId': self.env['ir.sequence'].next_by_code('vertical.lift.command'),
             'addr': shuttle.name,
-            'carrier': self.name,
-            'carrierNext': '',
+            'carrier': self.level,
+            'carrierNext': '0',
             'x': x,
             'y': y,
             'boxType': '',
@@ -40,7 +40,7 @@ class StockLocation(models.Model):
             'part': '',
             'desc': '',
         }
-        payload = message_template.format(subst)
+        payload = message_template.format(**subst)
         return payload.encode('iso-8859-1', 'replace')
 
     def _hardware_vertical_lift_tray_payload(self, cell_location=None):
@@ -83,4 +83,6 @@ class StockLocation(models.Model):
             payload = self._hardware_kardex_prepare_payload()
             _logger.debug("Sending to kardex: {}", payload)
             # TODO implement the communication with kardex
-        super()._hardware_vertical_lift_tray_payload(cell_location=cell_location)
+        else:
+            payload = super()._hardware_vertical_lift_tray_payload(cell_location=cell_location)
+        return payload
diff --git a/stock_vertical_lift_kardex/models/vertical_lift_shuttle.py b/stock_vertical_lift_kardex/models/vertical_lift_shuttle.py
index 67dc1131d..256439d35 100644
--- a/stock_vertical_lift_kardex/models/vertical_lift_shuttle.py
+++ b/stock_vertical_lift_kardex/models/vertical_lift_shuttle.py
@@ -4,6 +4,24 @@
 from odoo import api, models
 
 
+JMIF_STATUS = {
+    0: 'success',
+    101: 'common error',
+    102: 'sequence number invalid',
+    103: 'machine busy',
+    104: 'timeout',
+    105: 'max retry reached',
+    106: 'carrier in use or undefined',
+    107: 'cancelled',
+    108: 'invalid user input data',
+    201: 'request accepted and queued',
+    202: 'request processing started / request active',
+    203: 'carrier arrived, maybe overwritten by code 0',
+    301: 'AO occupied with other try on move back (store / put)',
+    302: 'AO occupied with other try on fetch (pick)',
+}
+
+
 class VerticalLiftShuttle(models.Model):
     _inherit = 'vertical.lift.shuttle'
 
@@ -13,19 +31,33 @@ class VerticalLiftShuttle(models.Model):
         values += [('kardex', 'Kardex')]
         return values
 
-    def _hardware_recv_response(self, conn):
-        # the implementation uses messages delimited with \r\n
-        response = b''
-        chunk = True
-        while chunk:
-            chunk = conn.recv(1)
-            response += chunk
-            if response.endswith(b'\r\n'):
-                break
-        return response
-
-    def _check_server_response(self, payload, response):
-        payload = payload.decode('iso-8859-1')
-        response = response.decode('iso-8859-1')
+    def _check_server_response(self, command):
+        response = command.answer
         code, sep, remaining = response.partition('|')
-        return code == "0"
+        code = int(code)
+        if code == 0:
+            return True
+        elif 1 <= code <= 99:
+            command.error = 'interface error %d' % code
+            return False
+        elif code in JMIF_STATUS and code < 200:
+            command.error = '%d: %s' % (code, JMIF_STATUS[code])
+            return False
+        elif code in JMIF_STATUS and code < 300:
+            command.error = '%d: %s' % (code, JMIF_STATUS[code])
+            return True
+        elif code in JMIF_STATUS:
+            command.error = '%d: %s' % (code, JMIF_STATUS[code])
+        elif 501 <= code <= 999:
+            command.error = '%d: %s' % (code, 'MM260 Error')
+        elif 1000 <= code <= 32767:
+            command.error = '%d: %s' % (
+                code, 'C2000TCP/C3000CGI machine error'
+            )
+        elif 0xFF0 <= code == 0xFFF:
+            command.error = '%x: %s' % (
+                code, 'C3000CGI machine error (global short)'
+            )
+        elif 0xFFF < code:
+            command.error = '%x: %s' % (code, 'C3000CGI machine error (long)')
+        return False
diff --git a/stock_vertical_lift_kardex/proxy/kardex-proxy.py b/stock_vertical_lift_kardex/proxy/kardex-proxy.py
new file mode 100644
index 000000000..f568c5a91
--- /dev/null
+++ b/stock_vertical_lift_kardex/proxy/kardex-proxy.py
@@ -0,0 +1,175 @@
+#!/usr/bin/python3
+import argparse
+import asyncio
+import logging
+import os
+import ssl
+import time
+
+import aiohttp
+
+_logger = logging.getLogger(__name__)
+
+
+class KardexProxyProtocol(asyncio.Protocol):
+    def __init__(self, loop, queue, args):
+        _logger.info("Proxy created")
+        self.transport = None
+        self.buffer = b""
+        self.queue = queue
+        self.loop = loop
+        self.args = args
+
+    def connection_made(self, transport):
+        _logger.info("Proxy incoming cnx")
+        self.transport = transport
+        self.buffer = b""
+
+    def data_received(self, data):
+        self.buffer += data
+        _logger.info("Proxy: received %s", data)
+        if len(self.buffer) > 65535:
+            # prevent buffer overflow
+            self.transport.close()
+
+    def eof_received(self):
+        _logger.info("Proxy: received EOF")
+        if self.buffer[-1] != b"\n":
+            # bad format -> close
+            self.transport.close()
+        data = (
+            self.buffer.replace(b"\r\n", b"\n")
+            .replace(b"\n", b"\r\n")
+            .decode("iso-8859-1", "replace")
+        )
+        self.loop.create_task(self.queue.put(data))
+        self.buffer = b""
+
+    def connection_lost(self, exc):
+        self.transport = None
+        self.buffer = b""
+
+
+class KardexClientProtocol(asyncio.Protocol):
+    def __init__(self, loop, queue, args):
+        _logger.info("started kardex client")
+        self.loop = loop
+        self.queue = queue
+        self.args = args
+        self.transport = None
+        self.buffer = b""
+
+    def connection_made(self, transport):
+        self.transport = transport
+        _logger.info("connected to kardex server %r", transport)
+
+    async def keepalive(self):
+        while True:
+            t = int(time.time())
+            msg = "61|ping%d|SH1-1|0|0||||||||\r\n" % t
+            await self.send_message(msg)
+            await asyncio.sleep(20)
+
+    async def send_message(self, message):
+        _logger.info("SEND %r", message)
+        message = message.encode("iso-8859-1")
+        self.transport.write(message)
+
+    async def process_queue(self):
+        while True:
+            message = await self.queue.get()
+            await self.send_message(message)
+
+    def data_received(self, data):
+        data = data.replace(b"\0", b"")
+        _logger.info("RECV %s", data)
+        self.buffer += data
+        if b"\r\n" in self.buffer:
+            msg, sep, rem = self.buffer.partition(b"\r\n")
+            self.buffer = rem
+            msg = msg.decode('iso-8859-1', 'replace').strip()
+            if msg.startswith('0|ping'):
+                _logger.info('ping ok')
+            else:
+                _logger.info('notify odoo: %s', msg)
+                self.loop.create_task(self.notify_odoo(msg))
+
+    def connection_lost(self, exc):
+        self.loop.stop()
+
+    async def notify_odoo(self, msg):
+        url = self.args.odoo_url + "/vertical-lift"
+        async with aiohttp.ClientSession() as session:
+            params = {'answer': msg, 'secret': self.args.secret}
+            async with session.post(url, data=params) as resp:
+                resp_text = await resp.text()
+                _logger.info(
+                    'Reponse from Odoo: %s %s', resp.status, resp_text
+                )
+
+
+def main(args, ssl_context=None):
+    logging.basicConfig(
+        level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
+    )
+    loop = asyncio.get_event_loop()
+    queue = asyncio.Queue(loop=loop)
+    # create the main server
+    coro = loop.create_server(
+        lambda: KardexProxyProtocol(loop, queue, args),
+        host=args.host,
+        port=args.port
+    )
+    loop.run_until_complete(coro)
+
+    # create the connection to the JMIF client
+    if args.kardex_use_tls:
+        if ssl_context is None:
+            ssl_context = ssl.create_default_context()
+    else:
+        ssl_context = None
+    coro = loop.create_connection(
+        lambda: KardexClientProtocol(loop, queue, args),
+        host=args.kardex_host,
+        port=args.kardex_port,
+        ssl=ssl_context,
+    )
+    transport, client = loop.run_until_complete(coro)
+    loop.create_task(client.keepalive())
+    loop.create_task(client.process_queue())
+    loop.run_forever()
+    loop.close()
+
+
+def make_parser():
+    listen_address = os.environ.get("INTERFACE", "0.0.0.0")
+    listen_port = int(os.environ.get("PORT", "7654"))
+    secret = os.environ.get("ODOO_CALLBACK_SECRET", "")
+    odoo_url = os.environ.get("ODOO_URL", "http://localhost:8069")
+    odoo_db = os.environ.get("ODOO_DB", "odoodb")
+    kardex_host = os.environ.get("KARDEX_HOST", "kardex")
+    kardex_port = int(os.environ.get("KARDEX_PORT", "9600"))
+    kardex_use_tls = (
+        False
+        if os.environ.get("KARDEX_TLS", "") in ("", "0", "False", "FALSE")
+        else True
+    )
+    parser = argparse.ArgumentParser()
+    arguments = [
+        ("--host", listen_address, str),
+        ("--port", listen_port, int),
+        ("--odoo-url", odoo_url, str),
+        ("--odoo-db", odoo_db, str),
+        ("--secret",  secret, str),
+        ("--kardex-host", kardex_host, str),
+        ("--kardex-port", kardex_port, str),
+        ("--kardex-use-tls", kardex_use_tls, bool),
+    ]
+    for name, default, type_ in arguments:
+        parser.add_argument(name, default=default, action="store", type=type_)
+    return parser
+
+if __name__ == "__main__":
+    parser = make_parser()
+    args = parser.parse_args()
+    main(args)
diff --git a/stock_vertical_lift_kardex/proxy/requirements.txt b/stock_vertical_lift_kardex/proxy/requirements.txt
new file mode 100644
index 000000000..ee4ba4f3d
--- /dev/null
+++ b/stock_vertical_lift_kardex/proxy/requirements.txt
@@ -0,0 +1 @@
+aiohttp
diff --git a/stock_vertical_lift_kardex/proxy/test.py b/stock_vertical_lift_kardex/proxy/test.py
new file mode 100644
index 000000000..5b6ad5188
--- /dev/null
+++ b/stock_vertical_lift_kardex/proxy/test.py
@@ -0,0 +1,102 @@
+import socket
+import asyncio
+import logging
+import time
+
+_logger = logging.getLogger('kardex.proxy')
+logging.basicConfig(level=logging.DEBUG)
+
+
+class KardexProxyProtocol(asyncio.Protocol):
+    def __init__(self, loop, queue):
+        _logger.info('Proxy created')
+        self.transport = None
+        self.buffer = b''
+        self.queue = queue
+        self.loop = loop
+
+    def connection_made(self, transport):
+        _logger.info('Proxy incoming cnx')
+        self.transport = transport
+        self.buffer = b''
+
+    def data_received(self, data):
+        self.buffer += data
+        _logger.info('Proxy: received %s', data)
+        if len(self.buffer) > 65535:
+            # prevent buffer overflow
+            self.transport.close()
+
+    def eof_received(self):
+        _logger.info('Proxy: received EOF')
+        if self.buffer[-1] != b'\n':
+            # bad format -> close
+            self.transport.close()
+        data = self.buffer.replace(b'\r\n', b'\n').replace(b'\n', b'\r\n').decode('iso-8859-1', 'replace')
+        task = self.loop.create_task(self.queue.put(data))
+        self.buffer = b''
+        print('toto', task)
+
+    def connection_lost(self, exc):
+        self.transport = None
+        self.buffer = b''
+
+
+class KardexClientProtocol(asyncio.Protocol):
+    def __init__(self, loop, queue):
+        _logger.info('started kardex client')
+        self.loop = loop
+        self.queue = queue
+        self.transport = None
+        self.buffer = b''
+
+    def connection_made(self, transport):
+        self.transport = transport
+        _logger.info('connected to kardex server %r', transport)
+
+    async def keepalive(self):
+        while True:
+            t = int(time.time())
+            msg = '61|ping%d|SH1-1|0|0||||||||\r\n' % t
+            await self.send_message(msg)
+            await asyncio.sleep(5)
+
+    async def send_message(self, message):
+        _logger.info('SEND %s', message)
+        message = message.encode('iso-8859-1').ljust(1024, b'\0')
+        self.transport.write(message)
+
+    async def process_queue(self):
+        while True:
+            message = await self.queue.get()
+            await self.send_message(message)
+
+    def data_received(self, data):
+        data = data.replace(b'\0', b'')
+        _logger.info('RECV %s', data)
+        self.buffer += data
+
+    def connection_lost(self, exc):
+        self.loop.stop()
+
+
+if __name__ == '__main__':
+    _logger.info('starting')
+    loop = asyncio.get_event_loop()
+    loop.set_debug(1)
+    queue = asyncio.Queue(loop=loop)
+    coro = loop.create_server(
+        lambda: KardexProxyProtocol(loop, queue),
+        port=3000,
+        family=socket.AF_INET
+    )
+    server = loop.run_until_complete(coro)
+    coro = loop.create_connection(lambda: KardexClientProtocol(loop, queue),
+                                  'localhost', 9600)
+    transport, client = loop.run_until_complete(coro)
+    print('%r' % transport)
+    loop.create_task(client.keepalive())
+    loop.create_task(client.process_queue())
+    _logger.info('run loop')
+    loop.run_forever()
+    loop.close()
diff --git a/stock_vertical_lift_kardex/requirements.txt b/stock_vertical_lift_kardex/requirements.txt
new file mode 100644
index 000000000..ee4ba4f3d
--- /dev/null
+++ b/stock_vertical_lift_kardex/requirements.txt
@@ -0,0 +1 @@
+aiohttp