refactored MsgSink and MsgSource

transceiver.py

@@ -1,15 +1,15 @@
-from msg_source import MsgSource
+from msg_talker import MsgTalker
 from a_backend import ABackend
 from msg_container import *
 
-class Transceiver(MsgSource):
+class Transceiver(MsgTalker):
 	def __init__(self, backend: ABackend, name: str):
-		MsgSource.__init__(self)
+		MsgTalker.__init__(self)
 		self.backend = backend
 		self.name = name
 
 	def on_recv(self, msg: MsgContainer):
-		self.call_sinks(msg)
+		self.call_listener(msg)
 
 	def send(self, data: bytes):
 		self.backend.send(self.name, data)