# Testing Ethernet Communication Between Arduino Mega and Laptop

**URL:** <https://forum.arduino.cc/t/testing-ethernet-communication-between-arduino-mega-and-laptop/1397477>\
**Category:** Programming\
**Created:** [July 23, 2025, 1:03pm UTC](https://forum.arduino.cc/t/testing-ethernet-communication-between-arduino-mega-and-laptop/1397477 "2025-07-23T13:03:11Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![adrino1](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/adrino1/32/1126598_2.png) [@adrino1](https://forum.arduino.cc/u/adrino1)\
**Post date:** [July 23, 2025, 1:03pm UTC](https://forum.arduino.cc/t/testing-ethernet-communication-between-arduino-mega-and-laptop/1397477/1 "2025-07-23T13:03:11Z")

</div>

I’m working on a setup where I have an **Arduino Mega** , a **W5500 Ethernet module** , and my **Windows laptop** , all connected to the same router. I want to send data from the Mega to my laptop over Ethernet.

I’ve connected the W5500 module to the Mega (using hardware SPI) and downloaded the Ethernet library. I’d like to test if the communication is working correctly.

Could you please guide me on:

- Which **example sketch** from the Ethernet library I should upload to the Mega to verify communication?

 ![image](https://europe1.discourse-cdn.com/arduino/original/4X/a/4/2/a4209af4a1be5da86d3e1c74d355d9cb55e4d9bf.png)

---

<div class="post-metadata">

**Author:** ![docdoc](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/docdoc/32/220907_2.png) [@docdoc](https://forum.arduino.cc/u/docdoc)\
**Post date:** [July 23, 2025, 2:35pm UTC](https://forum.arduino.cc/t/testing-ethernet-communication-between-arduino-mega-and-laptop/1397477/2 "2025-07-23T14:35:27Z")

</div>

I'd start with LinkStatus to test the communication between Arduino and the W5500 shield and the physical Ethernet link status.  
Then if you need to send data from Arduino to a laptop the easiest way is by using UDP so you should test it using UDPSendReceiveString (in your case just to send UDP packets). Then you need to design a minimal protocol, and your laptop should have kinda UDP receiver ready but I don't know either your PC programming skills or the requirements for your project.

Another way is to send data using http GET or POST to a web server/service, thus WebClient example could help you a bit.

As you can see, most of the things you need depend on what are the requirements you're setting up... Write a better and more complete description of your goals and we can try and help you more than this.

---

<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [January 19, 2026, 2:36pm UTC](https://forum.arduino.cc/t/testing-ethernet-communication-between-arduino-mega-and-laptop/1397477/3 "2026-01-19T14:36:22Z")

</div>

Closed on January 19, 2026, 2:36pm UTC

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.