- UBX: fixed data loss when sync byte in payload

- refactored

receiver/ubx_packetizer.py

@@ -13,6 +13,8 @@ class UbxPacketizer(MsgSink, MsgSource):
 		self.packet = b''
 		self.wait_sync = True
 		self.sync_count = 0
+		self.timestamp = 0
+		self.d_save = b''
 
 	def reset(self):
 		self.packet = b''
@@ -20,24 +22,27 @@ class UbxPacketizer(MsgSink, MsgSource):
 		self.sync_count = 0
 
 	def on_recv(self, msg: MsgContainer):
-		name = msg.name
-		timestamp = msg.timestamp
 		for n in range (0, len(msg.data)):
 			d = msg.data[n]
 			if d == self.sync_bytes[self.sync_count]:
+				self.d_save = struct.pack('B', d)
 				self.sync_count += 1
 				if self.sync_count == len(self.sync_bytes):
 					print("UBX-sync")
+					self.d_save = b''
+					self.timestamp = msg.timestamp
 					self.sync_count = 0
 					self.packet = b''
 					self.wait_sync = False
 			else:
+				self.packet += self.d_save
+				self.d_save = b''
 				if not self.wait_sync:
 					self.packet += struct.pack('B', d)
 					data, hdr = frame_parse(self.packet)
 					if data is not None:
 						if hdr.length == len(data):
-							self.call_sinks(MsgContainer(name, timestamp, self.packet))
+							self.call_sinks(MsgContainer(msg.name, self.timestamp, self.packet))
 							self.packet = b''