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Original file line number Diff line number Diff line change
Expand Up @@ -940,7 +940,7 @@ def publish(self, topic, payload=None, qos=0, retain=False):
A ValueError will be raised if topic is None, has zero length or is
invalid (contains a wildcard), if qos is not one of 0, 1 or 2, or if
the length of the payload is greater than 268435455 bytes."""
if topic is None or len(topic) == 0:
if topic is None or not topic:
raise ValueError('Invalid topic.')
if qos<0 or qos>2:
raise ValueError('Invalid QoS level.')
Expand Down