---
title: "AX1 as Server to test Telnet client Example, Arduino DUE"
url: "https://maker.wiznet.io/forum/12007"
markdown_url: "https://maker.wiznet.io/forum/12007/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "svia"
created: "2016-11-04T11:03:58+09:00"
last_activity: "2017-05-04T08:39:19+09:00"
language: "en"
views: 701
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# AX1 as Server to test Telnet client Example, Arduino DUE

## Question

Asked by svia on 2016-11-04 in Ethernet Chips.

Hello

I have an Arduino DUE+ ioshieldA, and I’m finding problems to test Arduino as TCP/IP client.

I am powering Arduino DUE from my laptop with the USB. My first doubt is if it is enough power?

I want to test the Arduino Telnet client Example, with application AX1.
I set AX1 to listen at port 3000.

AX1 connect to Arduino if it ils listening and Arduino is reprogram. In this case it is connected and I’m able to send a packet.

But, in the moment I open the Serial Monitor, AX1 gives error: Data Invalid.
And from this moment event reseting it doesn’t connect any more.
Any guess?

## Replies

### Reply 1 by Edward, 2016-11-08

Hi.

DUE + ioshieldA serial monitor output is normal operate?

First, please checking IP setting from wiz550io(ioshieldA)

If you don’t know, use arduino example web server(basic) code.

File → example → ethernet → webserver

If normal operate, Please checking telnet client code.

AX1 is basically Loopback TEST tool.

Thank you

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Source: https://maker.wiznet.io/forum/12007