ringbuffer and device detection to USB-CAN-relay

F3:F303/CANbus4BTA/kicad/stm32.kicad_pro

@@ -81,6 +81,7 @@
         "footprint_type_mismatch": "error",
         "hole_clearance": "error",
         "hole_near_hole": "error",
+        "holes_co_located": "warning",
         "invalid_outline": "error",
         "isolated_copper": "warning",
         "item_on_disabled_layer": "error",
@@ -541,7 +542,7 @@
       "plot": "gerbers",
       "pos_files": "",
       "specctra_dsn": "",
-      "step": "",
+      "step": "../../../../../../tmp/kompas-3d/Datchik_tolschiny_plenki_ki.stp",
       "svg": "",
       "vrml": ""
     },