AWSIoTPythonSDK/core/protocol/paho/client.py [2145:2150]:
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                        self._in_callback = True # Don't call loop_write after _send_publish()
                        rc = self._send_publish(m.mid, m.topic, m.payload, m.qos, m.retain, m.dup)
                        self._in_callback = False
                        if rc != 0:
                            self._out_message_mutex.release()
                            return rc
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AWSIoTPythonSDK/core/protocol/paho/client.py [2155:2160]:
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                        self._in_callback = True # Don't call loop_write after _send_publish()
                        rc = self._send_publish(m.mid, m.topic, m.payload, m.qos, m.retain, m.dup)
                        self._in_callback = False
                        if rc != 0:
                            self._out_message_mutex.release()
                            return rc
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