- 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()

.gitignore

@@ -1 +1,2 @@
 .idea/
+__pycache__/

msg_montainer.py

@@ -0,0 +1,13 @@
+
+
+class MsgContainer:
+	def __init__(self, name: str, timestamp: float = 0, data: bytes = b''):
+		self.name : str= name
+		self.timestamp : float = timestamp
+		self.data: bytes = data
+
+	def __str__(self):
+		return f"{self.name}: {self.timestamp}: {self.data}"
+
+	def __repr__(self):
+		return f"{self.name}: {self.timestamp}: {self.data}"

msg_sink.py

@@ -0,0 +1,10 @@
+from abc import ABC, abstractmethod
+from msg_montainer import MsgContainer
+
+class MsgSink(ABC):
+	def __init__(self):
+		pass
+
+	@abstractmethod
+	def on_recv(self, msg: MsgContainer):
+		pass

msg_source.py

@@ -0,0 +1,15 @@
+from abc import ABC
+from msg_montainer import MsgContainer
+from msg_sink import MsgSink
+
+class MsgSource(ABC):
+	def __init__(self):
+		self.sinks = {}
+
+	def register_recv(self, name: str, sink: MsgSink):
+		self.sinks[name] = {'sink': sink}
+
+	def call_sinks(self, msg: MsgContainer):
+		if msg.name in self.sinks:
+			sink = self.sinks[msg.name]['sink']
+			sink.on_recv(msg)

multi_client.py

@@ -2,15 +2,27 @@ import socket
 import selectors
 import time
 
-class MultiClient(object):
+from msg_montainer import MsgContainer
+from nmea import NmeaReceiver
+from msg_sink import MsgSink
+from msg_source import MsgSource
+from packetizer import Packetizer
+
+
+class MultiClient(MsgSource):
 	def __init__(self, servers: list[dict]):
-		self.sock_list = [{'name': s['name'], 'addr': (s['host'], s['port'])} for s in servers]
+		MsgSource.__init__(self)
 		self.sel = None
+		self.sock_list = [{'name': s['name'], 'addr': (s['host'], s['port'])} for s in servers]
+		self.receivers = {}
 		for server in self.sock_list:
 			sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 			sock.setblocking(False)
 			server['sock'] = sock
 
+	def register_recv(self, name: str, rx: MsgSink):
+		self.receivers[name] = {'rx': rx}
+
 	def find_by_addr(self, addr):
 		for sock in self.sock_list:
 			if sock['addr'] == addr:
@@ -29,16 +41,6 @@ class MultiClient(object):
 		for sock in self.sock_list:
 			sock['sock'].close()
 
-	def on_receive(self, rx_list: list):
-		for data in rx_list:
-			print(f"{self}: on_receive: 'Time': {data['timestamp'], data['name']}")
-
-	def send_request(self):
-		events = selectors.EVENT_READ | selectors.EVENT_WRITE
-		for sock in self.sock_list:
-			self.sel.register(sock['sock'], events, data=None)
-		print("receive")
-
 	def event_loop(self):
 		try:
 			while True:
@@ -46,12 +48,14 @@ class MultiClient(object):
 				rx_data = []
 				for key, mask in events:
 					descr = self.find_by_addr(key.fileobj.getpeername())
-					if mask & selectors.EVENT_READ:
-						timestamp = time.time()
-						data = key.fileobj.recv(1024)
-						rx_data.append({'timestamp': timestamp, 'name': descr['name'], 'data': data})
+					name = descr['name']
 
-				self.on_receive(rx_data)
+					if name in self.receivers:
+						rx = self.receivers[name]['rx']
+						if mask & selectors.EVENT_READ:
+							timestamp = time.time()
+							data = key.fileobj.recv(16)
+							rx.on_recv(MsgContainer(name, timestamp, data))
 
 		except KeyboardInterrupt:
 			print("Caught keyboard interrupt, exiting")
@@ -65,8 +69,32 @@ if __name__ == "__main__":
 		{'name': "zed-x20p", 'host': "192.168.22.93", 'port': 8731}
 	]
 
+	# TCPIP multi source receiver
 	mc = MultiClient(server_list)
+
+	# NMEA multi source receiver
+	receiver = NmeaReceiver()
+#	receiver.filter_by_msg_type('.*')
+	receiver.filter_by_msg_type('^.?GPGSV.*')
+	receiver.filter_by_msg_type('^.?GNGLL.*')
+
+	# Packetizer for "zed-x20p"
+	packetizer_0 = Packetizer()
+	packetizer_0.register_recv("zed-x20p", receiver)
+
+	# Packetizer for "neo-f9p"
+	packetizer_1 = Packetizer()
+	packetizer_1.register_recv("neo-f9p", receiver)
+
+	# Register both packetizers at multi source receiver
+	mc.register_recv("zed-x20p", packetizer_0)
+	mc.register_recv("neo-f9p", packetizer_1)
+
+	# Connect all sources
 	mc.connect()
+
+	# receive and block
 	mc.event_loop()
-	time.sleep(1)
+
+	# code never reached
 	mc.disconnect()

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}")
+

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)
+
+
+