private void handlePuback(MqttPubAckMessage message) {
MqttPendingPublish pendingPublish = this.client.getPendingPublishes().get(message.variableHeader().messageId());
pendingPublish.getFuture().setSuccess(null);
pendingPublish.onPubackReceived();
this.client.getPendingPublishes().remove(message.variableHeader().messageId());
pendingPublish.getPayload().release();
}
this.pendingPublishes.put(pendingPublish.getMessageId(), pendingPublish);
pendingPublish.startPublishRetransmissionTimer(this.eventLoop.next(), this::sendAndFlushPacket);