diff --git a/custom_components/koolnova_bms/__init__.py b/custom_components/koolnova_bms/__init__.py
new file mode 100644
index 0000000..b8f2c4f
--- /dev/null
+++ b/custom_components/koolnova_bms/__init__.py
@@ -0,0 +1,76 @@
+"""The koolnova BMS modbus integration."""  # pylint: disable=invalid-name
+
+import logging
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.helpers.typing import HomeAssistantType
+
+from homeassistant.const import CONF_HOST, CONF_PORT, CONF_NAME, CONF_DEVICE_ID
+
+from .const import DOMAIN
+#from .wfrac.device import Device
+
+_LOGGER = logging.getLogger(__name__)
+
+COMPONENT_TYPES = ["sensor", "climate", "select"]
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry):
+    """ Set up koolnova from a config entry. """
+
+    _LOGGER.info('async_setup_entry')
+#    if DOMAIN not in hass.data:
+#        hass.data[DOMAIN] = []
+#
+#    device: str = entry.data[CONF_HOST]
+#    name: str = entry.data[CONF_NAME]
+#    device_id: str = entry.data[CONF_DEVICE_ID]
+#    operator_id: str = entry.data[CONF_OPERATOR_ID]
+#    port: int = entry.data[CONF_PORT]
+#    airco_id: str = entry.data[CONF_AIRCO_ID]
+
+#    try:
+#        api = Device(hass, name, device, port, device_id, operator_id, airco_id)
+#        await api.update()  # initial update to get fresh values
+#        hass.data[DOMAIN].append(api)
+#    except Exception as ex:  # pylint: disable=broad-except
+#        _LOGGER.warning("Something whent wrong setting up device [%s] %s", device, ex)
+#
+#    for component in COMPONENT_TYPES:
+#        hass.async_create_task(hass.config_entries.async_forward_entry_setup(entry, component))
+#
+#    return True
+
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Handle removal of an entry."""
+    _LOGGER.info('async_unload_entry')
+#    if unloaded := await hass.config_entries.async_unload_platforms(entry, PLATFORMS):
+#        hass.data[DOMAIN].pop(entry.entry_id)
+#    return unloaded
+
+async def async_reload_entry(hass: HomeAssistant, entry: ConfigEntry) -> None:
+    """Reload config entry."""
+    _LOGGER.info('async_reload_entry')
+#    await async_unload_entry(hass, entry)
+#    await async_setup_entry(hass, entry)
+
+async def async_remove_entry(hass, entry: ConfigEntry) -> None:
+    """Handle removal of an entry."""
+    _LOGGER.info('async_remove_entry')
+#    for device in hass.data[DOMAIN]:
+#        temp_device: Device = device
+#        if temp_device.host == entry.data[CONF_HOST]:
+#            try:
+#                await temp_device.delete_account()
+#                _LOGGER.info(
+#                        "Deleted operator ID [%s] from airco [%s]",
+#                        temp_device.operator_id,
+#                        temp_device.airco_id,
+#                        )
+#                hass.data[DOMAIN].remove(temp_device)
+#            except Exception as ex:  # pylint: disable=broad-except
+#                _LOGGER.warning(
+#                        "Something whent wrong deleting account from airco [%s] %s",
+#                        temp_device.name,
+#                        ex,
+#                        )
diff --git a/custom_components/koolnova_bms/const.py b/custom_components/koolnova_bms/const.py
new file mode 100644
index 0000000..50083c0
--- /dev/null
+++ b/custom_components/koolnova_bms/const.py
@@ -0,0 +1,55 @@
+"""Constants used by the koolnova-bms component."""
+
+DOMAIN = "koolnova_bms"
+
+NUM_ZONES = 16
+
+REG_PER_ZONE = 4
+REG_ENABLED = 1
+REG_MODE = 2
+REG_TARGET_TEMP = 3
+REG_CURRENT_TEMP = 4
+
+REG_AIRFLOW = 65
+REG_AC_TARGET_TEMP = 69
+REG_AC_TARGET_FAN_MODE = 73
+REG_SERIAL_CONFIG = 77
+REG_SLAVE_ID = 78
+REG_EFFICIENCY = 79
+REG_SYSTEM_ENABLED = 81
+REG_SYS_KN_MODE = 82
+
+FIRST_ZONE_REGISTER = REG_ENABLED
+TOTAL_ZONE_REGISTERS = NUM_ZONES * REG_PER_ZONE
+FIRST_SYS_REGISTER = REG_AIRFLOW
+TOTAL_SYS_REGISTERS = 18
+
+FAN_OFF = 0
+FAN_LOW = 1
+FAN_MED = 2
+FAN_HIGH = 3
+FAN_AUTO = 4
+
+MODE_AIR_COOLING = 0x01
+MODE_AIR_HEATING = 0x02
+MODE_UNDERFLOOR_HEATING = 0x04
+MODE_UNDERFLOOR_AIR_COOLING = 0x05
+MODE_UNDERFLOOR_AIR_HEATING = 0x06
+
+HOLD_MODE_UNDERFLOOR_ONLY = "underfloor"
+HOLD_MODE_FAN_ONLY = "fan"
+HOLD_MODE_UNDERFLOOR_AND_FAN = "underfloor and fan"
+
+HVAC_MODE_OFF = "off"
+HVAC_MODE_COOL = "cool"
+HVAC_MODE_HEAT = "heat"
+
+ACMACHINES = 4
+
+AC1 = 1
+AC2 = 2
+AC3 = 3
+AC4 = 4
+
+HA_COMPONENT_SENSOR = "sensor"
+HA_COMPONENT_CLIMATE = "climate"
diff --git a/custom_components/koolnova_bms/manifest.json b/custom_components/koolnova_bms/manifest.json
new file mode 100644
index 0000000..c88661d
--- /dev/null
+++ b/custom_components/koolnova_bms/manifest.json
@@ -0,0 +1,13 @@
+{
+  "domain": "koolnova_bms",
+  "name": "koolnova BMS Modbus",
+  "codeowners": ["@sinseman44"],
+  "config_flow": true,
+  "documentation": "https://git.nas.benserv.fr/vincent/koolnova-BMS-Integration/src/branch/main/README.md",
+  "iot_class": "local_polling",
+  "issue_tracker": "https://git.nas.benserv.fr/vincent/koolnova-BMS-Integration/issues",
+  "requirements": [
+    "pymodbus>=3.5.0"
+  ],
+  "version": "0.1.0"
+}
diff --git a/custom_components/koolnova_bms/sensor.py b/custom_components/koolnova_bms/sensor.py
new file mode 100644
index 0000000..e69de29
diff --git a/hacs.json b/hacs.json
new file mode 100644
index 0000000..04784d7
--- /dev/null
+++ b/hacs.json
@@ -0,0 +1,5 @@
+{
+  "name": "koolnova BMS RS485 Modbus",
+  "homeassistant": "2023.10.5",
+  "render_readme": true
+}