---
title: "W5300 keep alive"
url: "https://maker.wiznet.io/forum/11219"
markdown_url: "https://maker.wiznet.io/forum/11219/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "ronitw"
created: "2015-08-09T13:54:12+09:00"
last_activity: "2017-05-04T08:36:42+09:00"
language: "en"
views: 909
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# W5300 keep alive

## Question

Asked by ronitw on 2015-08-09 in Ethernet Chips.

Hi,
We use w5300 chip in our project and want to activate the keep alive time register, or the SEND_KEEP.

In our system, settings register Sn_KPALVTR to 1 to activate sending keep alive packet once in 5sec.
After the w5300 had TCP connection and it is in SOCK_ESTABLISHED mode, only after one packet is transmitted it activates the KA packets.
It is not activating after receiving packets without sending.
In your DS said that:
“KA packet can be transmitted after Sn_SSR is changed to SOCK_ESTABLISHED and more
than one time DATA packet transmitting or receiving.”
Is it possible to active the w5300 to send KA packets after receiving data without sending?

Thanks!
Ronit

## Replies

### Reply 1 by bangbh, 2015-09-02

Hi,Ronit.

I’m peter employee of wiznet.
Unfortunately, It’s impossible to send KA packets without tcp sending.

Thanks.

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Source: https://maker.wiznet.io/forum/11219