log robot_state messages

Change-Id: If191edba9e05e42635c0ea05c28a0a07e87055db
diff --git a/frc971/wpilib/wpilib_interface.cc b/frc971/wpilib/wpilib_interface.cc
index b5c87b1..d7c23ce 100644
--- a/frc971/wpilib/wpilib_interface.cc
+++ b/frc971/wpilib/wpilib_interface.cc
@@ -246,6 +246,8 @@
       new_state->voltage_roborio_in = ControllerPower::GetInputVoltage();
       new_state->voltage_battery = ds_->GetBatteryVoltage();
 
+      LOG_STRUCT(DEBUG, "robot_state", *new_state);
+
       new_state.Send();
     }