class MQTT::Packet::Publish

def inspect

Returns a human readable string, summarising the properties of the packet 
def inspect
  "\#<#{self.class}: " \
    "d#{duplicate ? '1' : '0'}, " \
    "q#{qos}, " \
    "r#{retain ? '1' : '0'}, " \
    "m#{id}, " \
    "'#{topic}', " \
    "#{inspect_payload}>"
end