1 files changed, 15 insertions, 1 deletions

diff --git a/dexcom_reader/readdata.py b/dexcom_reader/readdata.py
index d60188b..5e2436b 100644
--- a/dexcom_reader/readdata.py
+++ b/dexcom_reader/readdata.py
@@ -332,4 +332,18 @@ def GetDevice (port, G5=False):
   return Dexcom(port)
 
 if __name__ == '__main__':
-  Dexcom.LocateAndDownload()
+
+  from optparse import OptionParser
+
+  G5_IS_DEFAULT = False
+
+  parser = OptionParser()
+  parser.add_option("--g4", action="store_false", dest="g5", default=G5_IS_DEFAULT, help="use Dexcom G4 instead of Dexcom G5")
+  parser.add_option("--g5", action="store_true",  dest="g5", default=G5_IS_DEFAULT, help="use Dexcom G5 instead of Dexcom G4")
+
+  (options, args) = parser.parse_args()
+
+  if options.g5:
+    DexcomG5.LocateAndDownload()
+  else:
+    Dexcom.LocateAndDownload()