From 37709f7a8b9c3e7e4eed49c23a710c3399a5fbe7 Mon Sep 17 00:00:00 2001
From: Joel Bender <jjb5@cornell.edu>
Date: Mon, 12 Sep 2016 15:04:14 -0400
Subject: [PATCH] sample BBMD hot fix -- put a null client on top of the BBMD

---
 samples/BBMD.py | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/samples/BBMD.py b/samples/BBMD.py
index 198a1cdc..6e2d1bcf 100755
--- a/samples/BBMD.py
+++ b/samples/BBMD.py
@@ -7,11 +7,11 @@
 table.
 """
 
-from bacpypes.debugging import ModuleLogger
+from bacpypes.debugging import bacpypes_debugging, ModuleLogger
 from bacpypes.consolelogging import ArgumentParser
 
 from bacpypes.core import run
-from bacpypes.comm import bind
+from bacpypes.comm import Client, bind
 
 from bacpypes.pdu import Address
 from bacpypes.bvllservice import BIPBBMD, AnnexJCodec, UDPMultiplexer
@@ -20,6 +20,21 @@
 _debug = 0
 _log = ModuleLogger(globals())
 
+
+#
+#   NullClient
+#
+
+@bacpypes_debugging
+class NullClient(Client):
+
+    def __init__(self, cid=None):
+        if _debug: NullClient._debug("__init__ cid=%r", cid)
+        Client.__init__(self, cid=cid)
+
+    def confirmation(self, *args, **kwargs):
+        if _debug: NullClient._debug("confirmation %r %r", args, kwargs)
+
 #
 #   __main__
 #
@@ -47,13 +62,18 @@ def main():
     local_address = Address(args.localaddr)
     if _debug: _log.debug("    - local_address: %r", local_address)
 
+    # create a null client that will accept, but do nothing with upstream
+    # packets from the BBMD
+    null_client = NullClient()
+    if _debug: _log.debug("    - null_client: %r", null_client)
+
     # create a BBMD, bound to the Annex J server on a UDP multiplexer
     bbmd = BIPBBMD(local_address)
     annexj = AnnexJCodec()
     multiplexer = UDPMultiplexer(local_address)
 
     # bind the layers together
-    bind(bbmd, annexj, multiplexer.annexJ)
+    bind(null_client, bbmd, annexj, multiplexer.annexJ)
 
     # loop through the rest of the addresses
     for bdtentry in args.bdtentry: