thanks chatgpt for fixing the buffer problem

ubxhandler.py

@@ -2,35 +2,40 @@ import asyncio
 import aioserial
 import aiomqtt
 import pyubx2
+import io
+import logging
 
 from command import command
 from handler import MQTTHandler, task
 
+# The pyubx2 library spams the console with errors that aren't errors.
+# I don't care if you failed to parse an incomplete buffer.
+logging.getLogger("pyubx2").setLevel(logging.FATAL)
 
-class StreamWrapper:
+
+class UBXAsyncParser:
     def __init__(self):
         self.buffer = bytearray()
 
-    def read(self, n=1):
-        if not self.buffer:
-            raise BlockingIOError
-        out = self.buffer[:n]
-        del self.buffer[:n]
-        return bytes(out)
+    def feed(self, data: bytes):
+        self.buffer.extend(data)
 
-    def readline(self):
-        """Return bytes up to and including the first newline."""
-        newline_index = self.buffer.find(b"\n")
-        if newline_index == -1:
-            # No newline yet, mimic non-blocking behavior
-            raise BlockingIOError
-        # Include the newline
-        line = self.buffer[: newline_index + 1]
-        del self.buffer[: newline_index + 1]
-        return bytes(line)
+    def parse(self):
+        while True:
+            stream = io.BytesIO(self.buffer)
+            try:
+                ubr = pyubx2.UBXReader(stream, parsing=True)
+                raw, parsed = ubr.read()
+                if raw is None:
+                    return
 
-    def extend(self, chunk):
-        self.buffer.extend(chunk)
+                consumed = stream.tell()
+                del self.buffer[:consumed]
+                yield parsed
+
+            except pyubx2.UBXStreamError:
+                # incomplete frame
+                return
 
 
 class UBXHandler(MQTTHandler):
@@ -43,31 +48,22 @@ class UBXHandler(MQTTHandler):
         super().__init__(mqtt_client, handler_id)
         self.serial_port = serial_port
 
-    async def read_serial(self):
-        buffer = StreamWrapper()
-        ubr = pyubx2.UBXReader(buffer, parsing=True)
-
-        while True:
-            chunk = await self.serial_port.read_async(256)
-            if chunk:
-                buffer.extend(chunk)
-
-                try:
-                    while True:
-                        raw, parsed = ubr.read()
-                        if raw is None:
-                            break
-                        yield parsed
-                except BlockingIOError:
-                    pass  # ordinary behaviour
-                except (pyubx2.UBXStreamError, Exception) as e:
-                    print("Some kinda error: ", type(e), e)
-            else:
-                await asyncio.sleep(0)
-
     @task
     async def handle_ubx_messages(self):
-        async for message in self.read_serial():
+
+        async def read_serial():
+            parser = UBXAsyncParser()
+            while True:
+                chunk = await self.serial_port.read_async(64)
+                if not chunk:
+                    await asyncio.sleep(0)
+                    continue
+
+                parser.feed(chunk)
+                for message in parser.parse():
+                    yield message
+
+        async for message in read_serial():
             if isinstance(message, pyubx2.UBXMessage):
                 for name, value in vars(message).items():
                     # Skip 'private' members