2 files changed, 11 insertions, 3 deletions

diff --git a/glucometerutils/common.py b/glucometerutils/common.py
index 4af2001..4c7694c 100644
--- a/glucometerutils/common.py
+++ b/glucometerutils/common.py
@@ -66,6 +66,7 @@ class GlucoseReading:
         default=MeasurementMethod.BLOOD_SAMPLE,
         validator=attr.validators.in_(
             MeasurementMethod)) # type: MeasurementMethod
+    device_id = attr.ib(default=None)  # type: int
 
     def get_value_as(self, to_unit):
         # type: (Unit) -> float
@@ -89,6 +90,7 @@ class KetoneReading:
     timestamp = attr.ib()  # type: datetime.datetime
     value = attr.ib()  # type: float
     comment = attr.ib(default='')  # type: Text
+    device_id = attr.ib(default=None)  # type: int
 
     def as_csv(self, unit):
         """Returns the reading as a formatted comma-separated value string."""
@@ -106,6 +108,7 @@ class TimeAdjustment:
         default=MeasurementMethod.TIME,
         validator=attr.validators.in_(
             MeasurementMethod))  # type: MeasurementMethod
+    device_id = attr.ib(default=None)  # type: int
 
     def as_csv(self, unit):
         del unit
diff --git a/glucometerutils/drivers/fslibre.py b/glucometerutils/drivers/fslibre.py
index 2823a2b..0e62aa6 100644
--- a/glucometerutils/drivers/fslibre.py
+++ b/glucometerutils/drivers/fslibre.py
@@ -26,6 +26,7 @@ from glucometerutils.support import freestyle
 # Fields of the records returned by both $history and $arresult?
 # Tuple of pairs of idx and field name
 _BASE_ENTRY_MAP = (
+    (0, 'device_id'),
     (1, 'type'),
     (2, 'month'),
     (3, 'day'),
@@ -116,7 +117,8 @@ def _parse_arresult(record):
         parsed_record.update(_parse_record(record, _ARRESULT_TIME_ADJUSTMENT_ENTRY_MAP))
         return common.TimeAdjustment(
             _extract_timestamp(parsed_record),
-            _extract_timestamp(parsed_record, 'old_'))
+            _extract_timestamp(parsed_record, 'old_'),
+            device_id=parsed_record['device_id'])
     else:
         return None
 
@@ -195,7 +197,8 @@ def _parse_arresult(record):
         _extract_timestamp(parsed_record),
         value,
         comment='; '.join(comment_parts),
-        measure_method=measure_method)
+        measure_method=measure_method,
+        device_id=parsed_record['device_id'])
 
 class Device(freestyle.FreeStyleHidDevice):
     """Glucometer driver for FreeStyle Libre devices."""
@@ -237,7 +240,9 @@ class Device(freestyle.FreeStyleHidDevice):
                 _extract_timestamp(parsed_record),
                 parsed_record['value'],
                 comment='(Sensor)',
-                measure_method=common.MeasurementMethod.CGM)
+                measure_method=common.MeasurementMethod.CGM,
+                device_id=parsed_record['device_id']
+            )
 
         # Then get the results of explicit scans and blood tests (and other
         # events).