---
title: "Precision about OTA feature"
url: "https://maker.wiznet.io/forum/11385"
markdown_url: "https://maker.wiznet.io/forum/11385/md"
type: "Forum topic"
category: "Wireless"
author: "phil31"
created: "2015-10-16T08:31:50+09:00"
last_activity: "2017-05-04T08:37:10+09:00"
language: "en"
views: 445
replies: 0
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Precision about OTA feature

## Question

Asked by phil31 on 2015-10-16 in Wireless.

Dear,

my module communicate over UART (handshake enable) with my CPU, as expected.
he answer right to all AT commands.

i try to update the firmware by OTA : 2 methods

- toggle twice FUNCTION pin when the module is running

- send AT+FOTA command

booth methods work perfectly with the EVB. i see on the terminal :

[code]Set OTA Mode

[OTA Upgrade Handler]

> > > Start OTA >>>>>>>>>>>>>>>>[/code]

==> then i can navigate to the module and upgrade my EVB. after the upgrade, the module right reboot with the new firmware.

when i test it on my board, both methods do same :
after running the FOTA command, or toggle twice the FUNCTION pin,
i receive the “Set OTA Mode” answer message from the module : ![:smiley:](https://emoji.discourse-cdn.com/twitter/smiley.png?v=12)
then NOTHING else (viewed with logic analyzer … NOTHING else after reply of the echo command) ![:astonished:](https://emoji.discourse-cdn.com/twitter/astonished.png?v=12)

now, i manually reset the board … (so the WIZFI module too) … and i see the end part of the OTA message !!! :

[code]

[OTA Upgrade Handler]

> > > Start OTA >>>>>>>>>>>>>>>>[/code]

Please some can explain the mechanism behind this feature, WIZFI250 view …?

- when the module receive the command, does he save it on flash location, then reboot and execute the command ?

- is there anything that can block the module to start the OTA Upgrade handler (after receive the AT command, or after toggle FUNCTION pin ) ?? ( for sure already carefully check all UART wires, and even try it with handshake disable)

Please anybody have some experience about that ?.. tips ?..

thanks, best regards
Phil

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Source: https://maker.wiznet.io/forum/11385