Index: simulator/plugins/salinebolus/loader.py
===================================================================
diff -u -rf4523ffcaff0d27f7392c943f0a487fcb01a7d34 -r967521dff94783ce48b50abc8db6bcd67bb501bf
--- simulator/plugins/salinebolus/loader.py	(.../loader.py)	(revision f4523ffcaff0d27f7392c943f0a487fcb01a7d34)
+++ simulator/plugins/salinebolus/loader.py	(.../loader.py)	(revision 967521dff94783ce48b50abc8db6bcd67bb501bf)
@@ -9,7 +9,8 @@
 # parent
 from simulator.dynamicloader import DynamicLoader
 # hd Simulator
-from dialin.ui.hd_simulator import HDSimulator, TXStates
+from simulator.interface import SimulationInterface
+from dialin.ui.hd_simulator import TXStates
 # plugin specific
 # -- none --
 
@@ -30,9 +31,8 @@
 
     saline_requested_state: TXStates
 
-    def __init__(self, hd_simulator: HDSimulator):
-        super().__init__(os.path.dirname(__file__), hd_simulator)
-        print(" ---------- ", self.hd_simulator)
+    def __init__(self, interface: SimulationInterface):
+        super().__init__(os.path.dirname(__file__), interface)
         self.saline_requested_state = TXStates.SALINE_BOLUS_STATE_IDLE
 
     def _init_loader(self):
@@ -84,7 +84,7 @@
             self.saline_requested_state = TXStates.SALINE_BOLUS_STATE_IN_PROGRESS
 
         target = self.cmbSalineAcceptTarget.currentText()
-        self.hd_simulator.cmd_set_saline_bolus_response(
+        self.interface.hd.cmd_set_saline_bolus_response(
             True, 0, int(target), self.saline_requested_state
         )
         self.lblSalineAction.setText('Accepted ' + target)
@@ -96,7 +96,7 @@
         :return: none
         """
         reason = self.spnSalineRejectReason.value()
-        self.hd_simulator.cmd_set_saline_bolus_response(
+        self.interface.hd.cmd_set_saline_bolus_response(
             False, reason, 0, self.saline_requested_state
         )
         self.lblSalineAction.setText('Rejected ' + "{}".format(reason))
@@ -108,7 +108,7 @@
         by calling the denaliMessage API setTreatmentSalineBolusData
         :return: none
         """
-        self.hd_simulator.cmd_set_treatment_saline_bolus_data(
+        self.interface.hd.cmd_set_treatment_saline_bolus_data(
             self.sldSalineTarget.value(),
             self.sldSalineCumulative.value(),
             self.sldSalineVolume.value()