Tested and improved the routing code.
Gateway demo now sends I-Am as each Device is added.
Added test for valid Network number when routing, and only send Reject message if this fails (and not if we just can't find a Device match).
Test the hop_count and discard the packet if would reach 0 and a destination Network is called for.
For the important Device_Object_Instance_Number(), will redirect to the Routed_Device_Object_Instance_Number() function if this is a routing build.
This leaves only the Who-Is and Who-Has handlers to be dealt with.
Renamed Lookup_Routed_Device_Address() as Routed_Device_Address_Lookup(), and replaced it in the routed npdu handler with a function that finds the "next" gateway or routed device, as per the destination address. (Less tied to the specifics of the gw_device.c implementation.)
Fixed a few build warnings (eg, %zu for size_t arguments).
Until we improve the makefile system, I've enabled BAC_ROUTING in config.h
For building, made it possible to include or exclude the routing functionality with simple changes in the main Makefile and enables in lib/Makefile and include/config.h
The Device object (device.c and .h) was extended to support the virtually routed Devices, with most of the new functions in new file gw_device.c to replace their simpler cousins in device.c.
cneilson