Feature/bacnet server client app example (#273)

* Create example server-client for R/W polling application example.

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

CMakeLists.txt

@@ -29,6 +29,11 @@ option(
   "compile the piface app"
   OFF)
 
+option(
+  BACNET_BUILD_BACPOLL_APP
+  "compile the bacpoll app"
+  ON)
+
 option(
   BACDL_ETHERNET
   "compile with ethernet support"
@@ -558,16 +563,14 @@ if(BACNET_STACK_BUILD_APPS)
     target_link_libraries(piface PRIVATE ${PROJECT_NAME})
   endif(BACNET_BUILD_PIFACE_APP)
 
-  # add_executable(
-  #   ptransfer
-  #   apps/ptransfer/main.c
-  #   apps/ptransfer/h_pt_a.h
-  #   apps/ptransfer/h_pt_a.c
-  #   apps/ptransfer/h_pt.h
-  #   apps/ptransfer/h_pt.c
-  #   apps/ptransfer/s_ptransfer.h
-  #   apps/ptransfer/s_ptransfer.c)
-  # target_link_libraries(ptransfer PRIVATE ${PROJECT_NAME})
+  if(BACNET_BUILD_BACPOLL_APP)
+    add_executable(bacpoll
+        apps/server-client/main.c
+        src/bacnet/basic/client/bac-task.c
+        src/bacnet/basic/client/bac-data.c
+        src/bacnet/basic/client/bac-rw.c)
+    target_link_libraries(bacpoll PRIVATE ${PROJECT_NAME})
+  endif(BACNET_BUILD_BACPOLL_APP)
 
   if(NOT BACDL_ETHERNET)
     add_executable(readbdt apps/readbdt/main.c)