public boolean hasTopic() {
            return ((bitField0_ & 0x00000020) != 0);
        }
<pre>
topic under which the message was published
</pre>

<code>optional string topic = 4;</code>

@return Whether the topic field is set.
turms-plugins/turms-plugin-livekit/src/main/java/im/turms/plugin/livekit/core/proto/models/UserPacket.java