Skip peer probe on remote

When remote ip is detected,
communicate by returning False
instead of None.

Use this indication to let ssdp
skip a transmit and growing
pending list in such a case.

confluent_server/confluent/discovery/protocols/ssdp.py

@@ -189,6 +189,10 @@ def snoop(handler, byehandler=None, protocol=None, uuidlookup=None):
                             continue
                         recent_peers.add(peer)
                         mac = neighutil.get_hwaddr(peer[0])
+                        if mac == False:
+                            # neighutil determined peer ip is not local, skip attempt
+                            # to probe and critically, skip growing deferrednotifiers
+                            continue
                         if not mac:
                             probepeer = (peer[0], struct.unpack('H', os.urandom(2))[0] | 1025) + peer[2:]
                             try:

confluent_server/confluent/neighutil.py

@@ -97,7 +97,9 @@ def get_hwaddr(ipaddr):
             _update_neigh()
             updated = True
         hwaddr = neightable.get(ipaddr, None)
-        if not hwaddr and not updated and netutil.ip_is_local(ipaddr):
+        if not hwaddr and not netutil.ip_is_local(ipaddr):
+            hwaddr = False
+        if hwaddr == None and not updated:
             _update_neigh()
             hwaddr = neightable.get(ipaddr, None)
     if hwaddr: