pybricks.iodevices.LWP3Device: Support Duplo Train.

Author: laurensvalk

CHANGELOG.md

@@ -14,6 +14,8 @@
   inputs ([pybricks-micropython#454]).
 - Added `pybricks.pupdevices.TechnicMoveHub` to control it as a peripheral. It
   cannot be used as a standalone device since it cannot run third-party firmware.
+- Added `pybricks.pupdevices.DuploTrain` to control it as a peripheral. It
+  cannot be used as a standalone device since it cannot ne updated.
 
 ### Changed
 - Changed the default `XboxController` connection timeout from indefinite

lib/lego/lego/lwp3.h

@@ -25,7 +25,8 @@ typedef enum {
 typedef enum {
     LWP3_HUB_KIND_WEDO2             = LWP3_HUB_KIND(LWP3_HUB_SYSTEM_WEDO2, 0),
 
-    LWP3_HUB_KIND_DUPLO_TRAIN       = LWP3_HUB_KIND(LWP3_HUB_SYSTEM_DUPLO, 0),
+    LWP3_HUB_KIND_DUPLO_TRAIN_BLACK = LWP3_HUB_KIND(LWP3_HUB_SYSTEM_DUPLO, 0),
+    LWP3_HUB_KIND_DUPLO_TRAIN_BLUE  = LWP3_HUB_KIND(LWP3_HUB_SYSTEM_DUPLO, 1),
 
     LWP3_HUB_KIND_BOOST             = LWP3_HUB_KIND(LWP3_HUB_SYSTEM_SYSTEM, 0),
     LWP3_HUB_KIND_SYSTEM_2IO        = LWP3_HUB_KIND(LWP3_HUB_SYSTEM_SYSTEM, 1),