2 files changed, 61 insertions, 10 deletions

diff --git a/glucometerutils/support/driver_base.py b/glucometerutils/support/driver_base.py
new file mode 100644
index 0000000..b7b3d0f
--- /dev/null
+++ b/glucometerutils/support/driver_base.py
@@ -0,0 +1,55 @@
+from abc import ABC, abstractmethod
+from datetime import datetime
+
+
+class GlucometerDriver(ABC):
+
+    def connect(self):
+        pass
+
+    def disconnect(self):
+        pass
+
+    @abstractmethod
+    def get_meter_info(self):
+        """Return the device information in structured form."""
+        pass
+
+    @abstractmethod
+    def get_serial_number(self):
+        pass
+
+    @abstractmethod
+    def get_glucose_unit(self):
+        """Returns the glucose unit of the device."""
+        pass
+
+    @abstractmethod
+    def get_datetime(self):
+        pass
+
+    def set_datetime(self, date=None):
+        """Sets the date and time of the glucometer.
+
+        Args:
+          date: The value to set the date/time of the glucometer to. If none is
+            given, the current date and time of the computer is used.
+
+        Returns:
+          A datetime object built according to the returned response.
+        """
+        if not date:
+            date = datetime.now()
+        return self._set_device_datetime(date)
+
+    @abstractmethod
+    def _set_device_datetime(self, date):
+        pass
+
+    @abstractmethod
+    def zero_log(self):
+        pass
+
+    @abstractmethod
+    def get_readings(self):
+        pass
diff --git a/glucometerutils/support/freestyle.py b/glucometerutils/support/freestyle.py
index ed8f7e9..1e8c097 100644
--- a/glucometerutils/support/freestyle.py
+++ b/glucometerutils/support/freestyle.py
@@ -12,12 +12,13 @@ import csv
 import datetime
 import logging
 import re
+from abc import ABC
 from typing import AnyStr, Callable, Iterator, List, Optional, Text, Tuple
 
 import construct
 
 from glucometerutils import exceptions
-from glucometerutils.support import hiddevice
+from glucometerutils.support import hiddevice, driver_base
 
 _INIT_COMMAND = 0x01
 _INIT_RESPONSE = 0x71
@@ -103,6 +104,7 @@ def _verify_checksum(message, expected_checksum_hex):
     if expected_checksum != calculated_checksum:
         raise exceptions.InvalidChecksum(expected_checksum, calculated_checksum)
 
+
 def convert_ketone_unit(raw_value):
     """Convert raw ketone value as read in the device to its value in mmol/L.
 
@@ -113,7 +115,8 @@ def convert_ketone_unit(raw_value):
     """
     return raw_value / 18.0
 
-class FreeStyleHidDevice(hiddevice.HidDevice):
+
+class FreeStyleHidDevice(hiddevice.HidDevice, driver_base.GlucometerDriver, ABC):
     """Base class implementing the FreeStyle HID common protocol.
 
     This class implements opening, initializing the connection and sending
@@ -295,12 +298,9 @@ class FreeStyleHidDevice(hiddevice.HidDevice):
         except ValueError:
             raise exceptions.InvalidDateTime()
 
-    def set_datetime(self, date=None):
+    def _set_device_datetime(self, date):
         # type: (datetime.datetime) -> datetime.datetime
-        """Sets the date and time of the device."""
 
-        if not date:
-            date = datetime.datetime.now()
         # The format used by the FreeStyle devices is not composable based on
         # standard strftime() (namely it includes no leading zeros), so we need
         # to build it manually.
@@ -314,10 +314,6 @@ class FreeStyleHidDevice(hiddevice.HidDevice):
 
         return self.get_datetime()
 
-    def zero_log(self):
-        """Not implemented, Abbott devices don't allow resetting memory."""
-        raise NotImplementedError
-
     def _get_multirecord(self, command):
         # type: (bytes) -> Iterator[List[Text]]
         """Queries for, and returns, "multirecords" results.