added I-Am demo and script to create vendor ID capture for Wireshark validation.

bacnet-stack/demo/Makefile

@@ -56,7 +56,7 @@ LFLAGS := -Wl,$(BACNET_LIB),$(SYSTEM_LIB)
 .EXPORT_ALL_VARIABLES:
 
 SUBDIRS = readprop writeprop readfile writefile reinit server dcc \
-	whohas whois ucov scov timesync epics readpropm readrange \
+	whohas whois iam ucov scov timesync epics readpropm readrange \
 	uptransfer getevent
 
 ifeq (${BACDL_DEFINE},-DBACDL_BIP=1)
@@ -89,5 +89,8 @@ gateway:
 server:
 	$(MAKE) -b -C server
 
+iam:
+	$(MAKE) -b -C iam
+
 router:
 	$(MAKE) -s -b -C router