- 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()

packetizer.py

@@ -0,0 +1,29 @@
+from msg_montainer import MsgContainer
+from msg_sink import MsgSink
+from msg_source import MsgSource
+from struct import pack
+
+class Packetizer(MsgSink, MsgSource):
+	def __init__(self):
+		MsgSink.__init__(self)
+		MsgSource.__init__(self)
+		self.packet = b''
+		self.wait_sync = True
+
+	def on_recv(self, msg: MsgContainer):
+		name = msg.name
+		data = msg.data
+		for n in range (len(data)):
+			d = data[n]
+			if d == 13 or d == 10:
+				timestamp = msg.timestamp
+				self.wait_sync = False
+				if len(self.packet) > 0:
+					self.call_sinks(MsgContainer(name, timestamp, self.packet))
+					self.wait_sync = True
+					self.packet = b''
+			elif not self.wait_sync:
+				self.packet += pack('B', d)
+
+
+