Index: leahi_dialin/td/treatment_delivery.py
===================================================================
diff -u -rc5bfcf84ed942ca5841bf9de155aa0f495b4d28d -r1ca63288b87154587f2e9df7624359fc8c419b9c
--- leahi_dialin/td/treatment_delivery.py	(.../treatment_delivery.py)	(revision c5bfcf84ed942ca5841bf9de155aa0f495b4d28d)
+++ leahi_dialin/td/treatment_delivery.py	(.../treatment_delivery.py)	(revision 1ca63288b87154587f2e9df7624359fc8c419b9c)
@@ -100,6 +100,16 @@
             self.can_interface.register_receiving_publication_function(DenaliChannels.ui_to_td_ch_id,
                                                                        self.msg_id_ui_version_info_response,
                                                                        self._handler_ui_version_response_sync)
+            # For current builds and setups without UI, there are no CAN messages sent on the bus to let the
+            # subsystems know there are other nodes and start publishing. Dialin will send a plain ACK to the CANbus over
+            # the dd channel to start publishing.
+            message = DenaliMessage.build_message(
+                channel_id=DenaliChannels.dialin_to_td_ch_id,
+                message_id=MsgIds.MSG_ID_ACK_MESSAGE_THAT_REQUIRES_ACK.value,
+                payload=bytearray(),
+                seq=0)
+            if message is not None:
+                self.can_interface.send(message, 0, is_ack=True)
 
         # create properties
         self.td_op_mode_timestamp = 0.0