- added Msg frame work with Msg container , Msg sources, Msg sinks

- added filter by message type to nmea receiver
- show case new features in MultiClient.main()

nmea.py

@@ -0,0 +1,20 @@
+from urllib.parse import to_bytes
+
+from msg_montainer import MsgContainer
+from msg_sink import MsgSink
+import re
+
+class NmeaReceiver(MsgSink):
+	def __init__(self):
+		MsgSink.__init__(self)
+		self.filters_msg_type = []
+
+	def filter_by_msg_type(self, msg_type: str):
+		self.filters_msg_type.append(msg_type)
+
+	def on_recv(self, msg: MsgContainer):
+		data = msg.data.decode(encoding="utf-8")
+		for pattern in self.filters_msg_type:
+			if re.match(pattern, data):
+				print(f"{self}: on_receive: {msg}")
+