restore _send_bytes()

adafruit_minimqtt/adafruit_minimqtt.py

@@ -464,6 +464,21 @@ def connect(  # noqa: PLR0913, too many arguments in function definition
             raise MMQTTException(exc_msg) from last_exception
         raise MMQTTException(exc_msg)
 
+    def _send_bytes(
+        self,
+        buffer: Union[bytes, bytearray, memoryview],
+    ):
+        bytes_sent: int = 0
+        bytes_to_send = len(buffer)
+        view = memoryview(buffer)
+        while bytes_sent < bytes_to_send:
+            try:
+                bytes_sent += self._sock.send(view[bytes_sent:])
+            except OSError as exc:
+                if exc.errno == EAGAIN:
+                    continue
+                raise
+
     def _connect(  # noqa: PLR0912, PLR0913, PLR0915, Too many branches, Too many arguments, Too many statements
         self,
         clean_session: bool = True,