diff --git a/custom_components/weishaupt_modbus/__init__.py b/custom_components/weishaupt_modbus/__init__.py
index 91f2242..623144f 100644
--- a/custom_components/weishaupt_modbus/__init__.py
+++ b/custom_components/weishaupt_modbus/__init__.py
@@ -2,26 +2,30 @@
 from homeassistant.core import HomeAssistant
 
 from .const import CONST
+from .heatpump import HeatPump
 
 PLATFORMS: list[str] = [
     "number",
     "select",
     "sensor",
-#    "switch",
+    #    "switch",
 ]
 
+
 # Return boolean to indicate that initialization was successful.
 # return True
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     # Store an instance of the "connecting" class that does the work of speaking
     # with your actual devices.
     # hass.data.setdefault(DOMAIN, {})[entry.entry_id] = hub.Hub(hass, entry.data["host"])
-
+    myHeatpump = HeatPump(entry)
+    myHeatpump.poll()
     # This creates each HA object for each platform your device requires.
     # It's done by calling the `async_setup_entry` function in each platform module.
     await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
     return True
 
+
 async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     # This is called when an entry/configured device is to be removed. The class
     # needs to unload itself, and remove callbacks. See the classes for further
diff --git a/custom_components/weishaupt_modbus/heatpump.py b/custom_components/weishaupt_modbus/heatpump.py
new file mode 100644
index 0000000..8198b8d
--- /dev/null
+++ b/custom_components/weishaupt_modbus/heatpump.py
@@ -0,0 +1,66 @@
+import warnings
+
+from pymodbus.client import ModbusTcpClient as ModbusClient
+
+from homeassistant.const import CONF_HOST, CONF_PORT
+
+from .const import TYPES
+from .hpconst import MODBUS_SYS_ITEMS
+
+
+class HeatPump:
+    _ip = None
+    _port = None
+    _ModbusClient = None
+
+    def __init__(self, config_entry):
+        self._ip = config_entry.data[CONF_HOST]
+        self._port = config_entry.data[CONF_PORT]
+        self._ModbusClient = None
+
+    def connect(self):
+        # try:
+        self._ModbusClient = ModbusClient(host=self._ip, port=self._port)
+        return self._ModbusClient.connected  # noqa: TRY300
+
+    # except:  # noqa: E722
+    # return None
+
+    def getValue(self, ModbusItem):
+        try:
+            if not self._ModbusClient.connected:
+                self.connect()
+            match ModbusItem.type:
+                case TYPES.SENSOR | TYPES.SENSOR_CALC:
+                    # Sensor entities are read-only
+                    ModbusItem._value = self._ModbusClient.read_input_registers(
+                        ModbusItem.address, slave=1
+                    ).registers[0]
+                case TYPES.SELECT | TYPES.NUMBER | TYPES.NUMBER_RO:
+                    ModbusItem._value = self._ModbusClient.read_holding_registers(
+                        ModbusItem.address, slave=1
+                    ).registers[0]
+
+        except:  # noqa: E722
+            warnings.warn("Getting value of " & ModbusItem.name & " failed")
+            return None
+
+    def setValue(self, ModbusItem, value) -> None:
+        try:
+            match ModbusItem.type:
+                case TYPES.SENSOR | TYPES.NUMBER_RO | TYPES.SENSOR_CALC:
+                    # Sensor entities are read-only
+                    return
+                case _:
+                    self.connect()
+                    self._ModbusClient.write_register(
+                        ModbusItem.address, int(value), slave=1
+                    )
+        except:  # noqua: E722
+            return None
+
+    def poll(self):
+        for item in MODBUS_SYS_ITEMS:
+            # warnings.warn(str(item.address))
+            self.getValue(item)
+            warnings.warn(str(item._value))
diff --git a/custom_components/weishaupt_modbus/items.py b/custom_components/weishaupt_modbus/items.py
index df3e83c..acedd11 100644
--- a/custom_components/weishaupt_modbus/items.py
+++ b/custom_components/weishaupt_modbus/items.py
@@ -1,14 +1,15 @@
 from .const import TYPES
 
+
 # An item of a status, e.g. error code and error text along with a precise description
-# A class is intentionally defined here because the assignment via dictionaries would not work so elegantly in the end, 
+# A class is intentionally defined here because the assignment via dictionaries would not work so elegantly in the end,
 # especially when searching backwards. (At least I don't know how...)
-class StatusItem():
+class StatusItem:
     _number = None
     _text = None
     _description = None
 
-    def __init__(self, number, text, description = None):
+    def __init__(self, number, text, description=None):
         self._number = number
         self._text = text
         self._description = description
@@ -37,31 +38,34 @@ def description(self):
     def description(self, value) -> None:
         self._description = value
 
-# A Modbus item, consisting of address, name, 
+
+# A Modbus item, consisting of address, name,
 #                              format (temperature, status, ..),
 #                              type (sensor, number, ..),
 #                              device (System, Heatpump, ..) and
 #                              optional result list from status items
 #                              (number entities: status = limits?
-class ModbusItem():
+class ModbusItem:
     _address = None
     _name = "empty"
     _format = None
     _type = TYPES.SENSOR
     _resultlist = None
     _device = None
+    _value = None
 
-    def __init__(self, address, name, format, type, device, resultlist = None):
+    def __init__(self, address, name, format, type, device, resultlist=None):
         self._address = address
         self._name = name
         self._format = format
         self._type = type
         self._device = device
         self._resultlist = resultlist
-        
+
     @property
     def address(self):
         return self._address
+
     @property
     def name(self):
         return self._name