Index: dialin/dg/dialysate_generator.py
===================================================================
diff -u -rfffbd99bcd6d15ce790e490e3b455fda43e34b8d -r0cab9b7a747d7e2dfc36698ea2481b62971ec786
--- dialin/dg/dialysate_generator.py	(.../dialysate_generator.py)	(revision fffbd99bcd6d15ce790e490e3b455fda43e34b8d)
+++ dialin/dg/dialysate_generator.py	(.../dialysate_generator.py)	(revision 0cab9b7a747d7e2dfc36698ea2481b62971ec786)
@@ -234,11 +234,12 @@
         self.dg_operation_mode = mode[0]
         self.dg_operation_sub_mode = smode[0]
 
-    def cmd_log_in_to_dg(self):
+    def cmd_log_in_to_dg(self, resend: bool = False):
         """
         Constructs and sends a login command via CAN bus.  Login required before \n
         other commands can be sent to the DG.
 
+        @param resend: (bool) if False (default), try to login once. Otherwise, tries to login indefinitely
         @return: 1 if logged in, 0 if log in failed
         """
 
@@ -249,7 +250,7 @@
         self.logger.info("Logging in to the DG...")
 
         # Send message
-        received_message = self.can_interface.send(message)
+        received_message = self.can_interface.send(message, resend=resend)
 
         if received_message is not None:
             if received_message['message'][DenaliMessage.PAYLOAD_START_INDEX] == 1:
Index: dialin/hd/hemodialysis_device.py
===================================================================
diff -u -r48606d83a0f15b06d9de893c2c5017c35f266264 -r0cab9b7a747d7e2dfc36698ea2481b62971ec786
--- dialin/hd/hemodialysis_device.py	(.../hemodialysis_device.py)	(revision 48606d83a0f15b06d9de893c2c5017c35f266264)
+++ dialin/hd/hemodialysis_device.py	(.../hemodialysis_device.py)	(revision 0cab9b7a747d7e2dfc36698ea2481b62971ec786)
@@ -189,11 +189,12 @@
         self.hd_operation_mode = mode[0]
         self.hd_operation_sub_mode = smode[0]
 
-    def cmd_log_in_to_hd(self):
+    def cmd_log_in_to_hd(self, resend: bool = False):
         """
         Constructs and sends a login command via CAN bus.  Login required before \n
         other commands can be sent to the HD.
 
+        @param resend: (bool) if False (default), try to login once. Otherwise, tries to login indefinitely
         @return: 1 if logged in, 0 if log in failed
         """
 
@@ -204,7 +205,7 @@
         self.logger.debug("Logging in...")
 
         # Send message
-        received_message = self.can_interface.send(message)
+        received_message = self.can_interface.send(message, resend=resend)
 
         if received_message is not None:
             if received_message['message'][DenaliMessage.PAYLOAD_START_INDEX] == 1: