extend() actually works better with a bytes object

Author: 2bndy5

adafruit_minimqtt/adafruit_minimqtt.py

@@ -464,7 +464,7 @@ def publish(self, topic, msg, retain=False, qos=0):
 
         # variable header = 2-byte Topic length (big endian)
         pub_hdr_var = bytearray(struct.pack(">H", len(topic)))
-        pub_hdr_var.append(topic.encode("utf-8"))  # Topic name
+        pub_hdr_var.extend(topic.encode("utf-8"))  # Topic name
 
         remaining_length = 2 + len(msg) + len(topic)
         if qos > 0: