private void ensureDestinationIdentitiesIsMutable() {
            if (!destinationIdentities_.isModifiable()) {
                destinationIdentities_ =
                        new com.google.protobuf.LazyStringArrayList(destinationIdentities_);
            }
            bitField0_ |= 0x00000004;
        }
<pre>
participant identity of user that sent the message
</pre>

<code>string participant_identity = 4;</code>

@param value The bytes for participantIdentity to set.
@return This builder for chaining.
turms-plugins/turms-plugin-livekit/src/main/java/im/turms/plugin/livekit/core/proto/models/DataPacket.java