How to use

DupPubRelMessageStore

in

cn.wizzer.iot.mqtt.server.common.message

@Override
public void put(String clientId, DupPubRelMessageStore dupPubRelMessageStore) {
  dupPubRelMessageCache.put(clientId, dupPubRelMessageStore.getMessageId(), dupPubRelMessageStore);
}

public void processPubRec(Channel channel, MqttMessageIdVariableHeader variableHeader) {
  MqttMessage pubRelMessage = MqttMessageFactory.newMessage(
    new MqttFixedHeader(MqttMessageType.PUBREL, false, MqttQoS.AT_MOST_ONCE, false, 0),
    MqttMessageIdVariableHeader.from(variableHeader.messageId()), null);
  LOGGER.debug("PUBREC - clientId: {}, messageId: {}", (String) channel.attr(AttributeKey.valueOf("clientId")).get(), variableHeader.messageId());
  dupPublishMessageStoreService.remove((String) channel.attr(AttributeKey.valueOf("clientId")).get(), variableHeader.messageId());
  DupPubRelMessageStore dupPubRelMessageStore = new DupPubRelMessageStore().setClientId((String) channel.attr(AttributeKey.valueOf("clientId")).get())
    .setMessageId(variableHeader.messageId());
  dupPubRelMessageStoreService.put((String) channel.attr(AttributeKey.valueOf("clientId")).get(), dupPubRelMessageStore);
  channel.writeAndFlush(pubRelMessage);
}

  MqttMessage pubRelMessage = MqttMessageFactory.newMessage(
      new MqttFixedHeader(MqttMessageType.PUBREL, true, MqttQoS.AT_MOST_ONCE, false, 0),
      MqttMessageIdVariableHeader.from(dupPubRelMessageStore.getMessageId()), null);
  channel.writeAndFlush(pubRelMessage);
});