---
title: "WizFi 360 Segment ID issue"
url: "https://maker.wiznet.io/forum/14582"
markdown_url: "https://maker.wiznet.io/forum/14582/md"
type: "Forum topic"
category: "Wireless"
author: "Padmini"
created: "2022-06-17T20:06:50+09:00"
last_activity: "2022-07-13T00:09:37+09:00"
language: "en"
views: 530
replies: 3
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# WizFi 360 Segment ID issue

## Question

Asked by Padmini on 2022-06-17 in Wireless.

Hi Team,

We are using **WizFi 360** WiFi module with firmware version 1.0.7.5 and Using CIPSENDBUF Command for transmitting data.

WiFi module returns ERROR response after segment ID 65535 (see the attachment below)

[![image](https://maker.wiznet.io/forum_uploads/wiznet/original/2X/f/f96c86093e190156526fc8825e106d590725fa18.png) image395×633 7.81 KB](https://maker.wiznet.io/forum_uploads/wiznet/original/2X/f/f96c86093e190156526fc8825e106d590725fa18.png)

I tested 3 times and received ERROR exactly after segment ID 65535 on all 3 attempts.

as per 1.1.1.2 WizFi AT instruction set, Segment ID is 4 bytes.

But we are using 1.0.7.5, so wanted to know

1. The size of segment ID as per 1.0.7.5 firmware version ?

2. 65535 is higher range of 2 bytes, so suspecting on segment ID. Can you help us in understanding the reason for receiving Error if segment ID is not the root cause for receiving ERROR ?

Thanks,
Padmini

## Replies

### Reply 1 by austin, 2022-06-22

Hello [@Padmini](https://maker.wiznet.io/u/padmini),

In F/W 1.0.7.5, the variable to manage segment ID is set to 2 bytes.
(Also in F/W version 1.1.x.x, the variable to manage segment ID is set to 2 bytes.)

Therefore, if the segment ID exceeds 65535, ERROR is returned.

If there is no problem even after modifying F/W, put a routine to reset the segment ID before the segment ID reaches 65535.

### Reply 2 by Padmini, 2022-06-22

Hi Austin,

It means, Reset of segment ID when segment ID crosses 65535 is not handled in WizFi firmware ?

### Reply 3 by austin, 2022-06-24

Hi [@Padmini](https://maker.wiznet.io/u/padmini)

If segment ID crosses 65535, automatic reset is not handled in WizFi360 F/W.

So, you have to manually reset the segment ID through the AT command.

Sorry, but v1.0.7.5 is not supported F/W, so fixing segment ID to be automatically reset in v1.0.7.5 is not supported.

We will review to fix the segment ID reset issue in the next version(v1.1.1.8 or higher).

---

Source: https://maker.wiznet.io/forum/14582