Merge branch 'master' into bracz-idf-downintegrate

* master:
  Upintegrate changes from the OpenMRNIDF repository (#771)
  Adds support for DCC extended accessories  (#769)
  Fix incorrect consumer identified message being emitted by dcc accy producer. (#768)
  Avoids rendering hidden segments. (#767)
  Adds trailing zero to the cdi XML file written to the filesystem. (#777)
  Fix target subdirectory name (#775)
  Fixes file comment.
  Adds an application (hub_test) for testing the throughput of a hub or a CAN-bus (#762)
  Adds a helper function to decode a 14-bit 9.2.1.1 address into address type and raw address. (#766)
  Fix broken test.
  Accessory packet refactoring and POM support (#764)
  Adds support for Offset(n) attribute in the CDI  (#765)
  Adds local loopback to TractionThrottle. (#756)
  Fix test flakiness.
  Fix compile error on FdUtils under freertos.

applications/hub_test/Makefile

@@ -0,0 +1,3 @@
+SUBDIRS = targets
+-include config.mk
+include $(OPENMRNPATH)/etc/recurse.mk

applications/hub_test/README.md

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+Hub throughput testing application {#hub_test_application}
+==================================
+
+[TOC]
+
+# Goal
+
+The purpose of Hub testing is to verify an OpenLCB link or bus for qualitative
+and quantitative performance characteristics. These are as follows.
+
+Qualitative:
+- The link has to be lossless.
+- There is only limited reordering allowed within the link.
+- There has to be proper throttling for ingress of packets to the link.
+
+Quantitative:
+- What is the maximum throughut of packets that can be accepted on the link.
+- What is the round-trip-time of the link.
+- What is the jitter on the timing of the packet round-trips.
+
+For hubs, a relevant question is also how do these metrics change as the number
+of clients on the hub are increased.
+
+## Testing methodology
+
+The application contains a load generator, and a receiver. For a given test,
+one generator and one or more receivers have to be attached to the same bus.
+
+The generator supplies a given load to the bus. This load may be a fixes
+traffic, or the maximum traffic that the bus is willing to accept.
+
+The receiver watches for the traffic coming from the generator, verifies the
+qualitative attributes, and measures the quantitative attributes. Statistics
+about this are printed to the screen.
+
+

applications/hub_test/config.mk

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+../default_config.mk

applications/hub_test/subdirs

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+SUBDIRS = \
+

applications/hub_test/targets/Makefile

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+SUBDIRS = \
+          linux.x86 \
+
+include $(OPENMRNPATH)/etc/recurse.mk

applications/hub_test/targets/linux.x86/.gitignore

@@ -0,0 +1 @@
+hub_test

applications/hub_test/targets/linux.x86/Makefile

@@ -0,0 +1,2 @@
+-include ../../config.mk
+include $(OPENMRNPATH)/etc/prog.mk