Merge pull request adafruit#49 from askpatrickw/patch-1

Adafruit Logging is required

Author: brentru

README.rst

@@ -20,6 +20,7 @@ Dependencies
 This driver depends on:
 
 * `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
+* `Adafruit Logging <https://github.com/adafruit/Adafruit_CircuitPython_Logging>`_
 
 Please ensure all dependencies are available on the CircuitPython filesystem.
 This is easily achieved by downloading

adafruit_minimqtt/adafruit_minimqtt.py

@@ -246,7 +246,9 @@ def remove_topic_callback(self, mqtt_topic):
         try:
             del self._on_message_filtered[mqtt_topic]
         except KeyError:
-            raise KeyError("MQTT topic callback not added with add_topic_callback.")
+            raise KeyError(
+                "MQTT topic callback not added with add_topic_callback."
+            ) from None
 
     @property
     def on_message(self):
@@ -287,7 +289,7 @@ def connect(self, clean_session=True):
                 conntype = _the_interface.TLS_MODE
                 self._sock.connect((self.broker, self.port), conntype)
             except RuntimeError as e:
-                raise MMQTTException("Invalid broker address defined.", e)
+                raise MMQTTException("Invalid broker address defined.", e) from None
         else:
             try:
                 if self.logger is not None:
@@ -299,7 +301,7 @@ def connect(self, clean_session=True):
                 )[0]
                 self._sock.connect(addr[-1], _the_interface.TCP_MODE)
             except RuntimeError as e:
-                raise MMQTTException("Invalid broker address defined.", e)
+                raise MMQTTException("Invalid broker address defined.", e) from None
 
         # Fixed Header
         fixed_header = bytearray([0x10])

adafruit_minimqtt/matcher.py

@@ -55,7 +55,7 @@ def __getitem__(self, key):
                 raise KeyError(key)
             return node.content
         except KeyError:
-            raise KeyError(key)
+            raise KeyError(key) from None
 
     def __delitem__(self, key):
         """Delete the value associated with some topic filter :key"""
@@ -67,7 +67,7 @@ def __delitem__(self, key):
                 lst.append((parent, k, node))
             node.content = None
         except KeyError:
-            raise KeyError(key)
+            raise KeyError(key) from None
         else:  # cleanup
             for parent, k, node in reversed(lst):
                 if node.children or node.content is not None: