Questions tagged [ethernet]

Ethernet can be used for cabled communication between an Arduino and a computer, server, or website. For question concerning the Arduino Ethernet board, use the tag "arduino-ethernet" instead.

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Arduino Ethernet shield frequently drops its IP address

Im working on a sketch that needs to display some internal variable values and analogue reads in a simple webpage. The only catch is that it needs to be as reliable as possible. Im getting some odd ...
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STM32Ethernet UDP misses some packets

Using STM32Duino on Nucleo F429ZI: #include <LwIP.h> #include <STM32Ethernet.h> #define UDP_TX_PACKET_MAX_SIZE 512 #include <EthernetUdp.h> IPAddress remoteIP; unsigned int ...
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44 views

HTTP parsing with authentication in Arduino + ethernet shield

i am trying to parse a page from the route by using Arduino + Ethernet shield. before Arduino testing. I tested my code via python as it shows below. from this code i can get the data as i wish where ...
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34 views

Ethernet shield connected to local network, not to internet

Using the WebServer example file I have been able to confirm that my arduino is connected to my local network and I can open the page in my browser. However any attempt at contacting addresses outside ...
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56 views

When connecting, client.connect() returns 0

I'm using an arduino UNO with ethernet shield. When following a few guides online for a school project I came across this issue. First code sample: #include <SPI.h> #include <...
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68 views

Is there an Arduino library that uses ARP to get list of connected devices on network?

I have been looking for a library that can execute an ARP (Address Resolution Protocol) command to return a list of connected devices on the network. The idea is that it would send the request to the ...
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48 views

Refreshing a web-page hangs after few times

I'm using a Nucleo F429ZI board and I wrote a sketch that enables a simple web-server: #include <LwIP.h> #include <STM32Ethernet.h> const int WEB_PORT = 80; EthernetServer server(...
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22 views

EthernetClient not initializing properly

I am trying to make a connection with the EthernetClient, but it always fails with code 0. I decided to write a small code just to test if the client ever becomes ready, and as I suspected it does not....
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25 views

ethernet router in arduino using two enc28j60

I have read in the uIP manual that only one interface can be managed by the uip stack: "The uIP implementation is designed to have only the absolute minimal set of features needed for a full TCP/IP ...
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40 views

Arduino LAN/TP tester at some frequency

I have the notion of putting together a TP cable tester with an arduino. I've seen hacks sending power and lighting up a LED to check continuity, and used a similar 'professional' tester that just ...
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79 views

MQTT on nano with Ethernet shield not working

I'm using an arduino nano with an ethernet shield (ENC28J60), and ethernet eem to be working (I can create a webserver with Ethercard library).However, i'm stuck when i try to connect to a MQTT ...
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detect a dropped tcp connection

Is it possible to detect a dropped connection using WiFi server? Example: Windows disables the Ethernet connection to the ESP during an active connection. After re enabling the connection it is not ...
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ethernet module works with uno, but not with nano

I use etherCard Library with ENC28J60-EDC8J60 ethernet module When plugging the "backSoon" example into an arduino UNO, everything works fine, but when i plug it into a nano, as seen in some tutorial ...
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22 views

command keeps echoing because web page tries refreshing

I want to execute a action only once when I press web page button but as the page tries refreshing the action gets executed in a loop. I am using the wifimanualwebserver example for esp8266. Please ...
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31 views

connection to ESP using pyVisa

I'm building a small LXI device using a the OLIMEX ESP32 POE Board. Sending commands to the device using pyVisa works fine, but queries don't. Only the IDN? query works. From the ESP I get the ...
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85 views

controllino and modbus tcp protocol

i have to make a network made of a master (made with controllino) and a slaves (also made with controllino) and they can comunicate with the modbus tcp protocol, i know that controllino works like a ...
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27 views

Ethernet.h Ethernet.Begin(mac) only connects if i have a LiquidCrystal object from LiquidCrystal.H

I have the following code; #include <Ethernet.h> #include <SPI.h> #include <LiquidCrystal.h> LiquidCrystal lcd(31, 30, 29, 28, 27, 26, 25, 24, 23, 22); byte mac[] = { 0xDE, 0xAD, ...
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143 views

Ethernet TCP communication between two arduinos not working

So I've got two arduinos Leonardo ETH, both plugged into a local network I host on my computer, and I'm trying to make them communicate through ethernet. One of my arduinos is collecting data from 2 ...
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48 views

Arduino Mega failing to connect to XAMPP database/php server to send HTTP requests

I have developed an application with a SunFounder Mega2560 with a W5100 Ethernet shield that acts as a server and successfully parses TCP message packets from a client sending in updates. I am now ...
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23 views

Remote Arduinos polling a master Ardrino over ethernet/wifi

I'm setting up a "Panic Button" for our Front Office. The concept is to have a master Arduino with the button and 4 other Arduinos with Strobes and/or alarms to alert the rest of the staff. The bells ...
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1answer
151 views

Arduino HTTP Request Fails Slow Cellular Connection

Setup: Arduino Mega 2560 w/ Wiznet W5500 Ethernet Sheild Using TP-Link TL-MR6400 LTE router to connect to internet over cellular connection in Uganda. Using an HTTP Post with the following, ...
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289 views

Ethernet Shield Issue

I just bought a Ethernet Shield for my Arduino UNO. I connected it to my arduino and flashed the Example code for Ethernet Shield, but the code didn't work. The COLL LED on ethernet shield is glowing ...
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47 views

one Arduino with RS485 and Ethernet shields: does this work?

I'm planning to wire a few Arduinos together via RS485, and have one of them act as a hub that collects information from the others and presents it via http on an Ethernet connection. For instance ...
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1answer
220 views

Public IP for Arduino with Ethernet shield and Arduino Uno

I'm new Arduino and I would like you to help me. I would like to have a public IP so that anyone can get access to it, not only from domestic domain. What could I do?. I'm using Arduino Uno, Arduino ...
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31 views

My webswerver works fine when there is only 1 servo used/defined in my code

I am trying to make a webserver which controls my 3 servos for a robotic arm. When I define and use 1 servo it is nice and quick, but whereas if I use more than 1 the webserver is very slow and barely ...
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334 views

How to create a Arduino socket server to receive messages

From linux I can send a socket message using netcat echo "Hello" | nc 88.109.110.161 100 But I don't know how to setup the socket server for listening incoming messages using the ethernet shield. ...
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120 views

UDP behavior different for STM32

I'm facing a weird situation, where the UDP behavior seems different in STM32 porting (stm32duino). Short question Besides port and address, what are the other parameters that characterize the UDP ...
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69 views

Arduino with Ethernet Shield with PC to upload data to Microsoft Azure

i am a student doing a project related to datalogging. My project is a rehabilitation device that uses 2 rotary encoders to record data for rotation and linear movement of a human arm. The data ...
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138 views

Can't parse large json file

For a project I've to parse a big json file. Unfortunately it does not work as expected. Here is the json file: { "data1": "...
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1answer
90 views

Limitations of connecting to many Arduinos via Ethernet?

I'm planning a project where I need to control a lot of Arduino Unos from a single PC. I'll need to send commands to the Arduinos and receive responses, as well as have the ability to update each ...
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76 views

STM32F103C8 reset button not working

I am working project, using STM32F103C8T6 and W5500 Ethernet module. My project is something like network relay. My problem is that the STM32F103 can not boot up after pressing reset button when the ...
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221 views

Read SNMP OID values with Arduino

I wish to read SNMP predefined OID values from other devices, can it be done with Arduino? I searched all over the internet for the past 2 weeks about Arduino with SNMP and found a lot of great ...
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1answer
154 views

Mini ethernet shield pins don't have SI

Please somebody who had the same issue help me. The question is how to connect this Mini Ethernet shield to an Arduino. The main problem is the pins that my shield have or haven't; my current ...
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1answer
161 views

Send files via network [duplicate]

I want to send a file from an Arduino to the server or another Arduino. I wrote a code that's open the file then write the content of the text on an array and then send it. That would work if the ...
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79 views

Sending .wav via network

I'm working in a project and part of this project is sending a .wav file from an Arduino to other device (for example anther Arduino). I already am able to send a .txt file from an SD which was ...
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27 views

WebClient Not Working On Shared Network

I'm working on a school project, and I use Arduino Uno to collect some data with sensors, and then send it to an online database. The Arduino is connected to the Internet via an Ethernet Shield and an ...
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275 views

Ethernet Shield - Not Working Properly Always

I'm working on a school project and using Arduino Uno. The basic working method for the project is as follows: Read temperature from LM-35. Read CO2 level in air using MH-Z14A. Upload data to server ...
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2answers
2k views

Remotely uploading code to an Arduino board over the internet [closed]

I recently used Particle Photon that allows me to upload firmware (.bin file) remotely over the internet. I would like to use something like this for my Arduino but I cannot find anything like that. ...
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1answer
58 views

WSO2 IoTS : No Data shown on Server by Arduino connected via Ethernet

Description: While enrolling Arduino device on WSO2 IoT server, I made necessary(WiFi to Ethernet connection) changes in the sketch that I downloaded from the server and uploaded it. The following ...
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1answer
580 views

Using c_str() on String for IPAddress with NTPClient provides wrong values

Libraries NTPClient Board Olimex ESP32-POE board Behaviour I have written a code that connects the board to a local NTP Server (which is an embedded board). I tried assigning the IP Address of ...
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1answer
98 views

Nano & Ethernet will not write to PushingBox on a workplace network (but will at home)

I have a Nano+ENC28J60 and I'm using Pushingbox which I have setup to write data to a GoogleDrive spreadsheet which works perfectly at home. However when I take it to my workplace it no longer works. ...
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1answer
134 views

DF Robot W5200 Ethernet Shield for an Arduino Uno not working?

I've been working on using an ethernet shield for my Arduino Uno for a couple weeks now. I've been going through the problems one by one and now realise that there seems to be nothing transmitting. ...
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3k views

Modbus IP with Simply Modbus TCP

include SPI.h include Ethernet.h include Modbus.h include ModbusIP.h //Modbus Registers Offsets (0-9999) const int SENSOR_IREG = 100; //Used Pins const int sensorPin = A0; //ModbusIP object ModbusIP ...
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1answer
185 views

How to flash an ATMEGA2560 using a WIZnet 5500?

I am wondering if anyone has ever flashed a ATMEGA2560 utilizing a WIZnet 5500? I have looked at this bootloader package but it only supports the 5100. I may have to do it myself but am a little ...
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2k views

Using AysncUDPMessage for ESP32 to send string data

I am in search for some examples as to how can one use the AsyncUDPMessage in an Application for sending out UDP packets to a host with specific IP address and Port number from an ESP-WROOM-32 (Olimex ...
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2answers
5k views

Ethernet nodemcu

I have a question that might be a #noob question but I am wondering if there is a board similar to the nodemcu in size that runs arduino code but instead can use ethernet to connect to the network ...
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1answer
39 views

Ethernet socket impedes adding shields

I just bought a KEYESTUDIO W5500 Ethernet Arduino without realizing that the Ethernet socket on the board impedes adding any additional shields to the device because: Horizontally the socket runs ...
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2answers
1k views

How to store an RFID tag number in a string

I want to send RFID tag number to PHP page. So far I have sent a fixed string to php and it worked, now I am not getting data in string when i scan rfid tag. I want to store every RFID tag number in a ...
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106 views

Directly connect Arduino to Macbook over Ethernet

I am trying to connect my Arduino to my MacBook over ethernet via a thunderbolt-ethernet dongle. However, I am unable to access my Arduino over Ethernet. The problem is very similar to one mentioned ...
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214 views

if two arduinos are connected by I2C and one of them is using an ethernet shield, does that grant both of them access to the internet?

i have two arduino mega and they send data to each other by an I2C connection. But one of those arduinos is connected to an ethernet shield which allows it to send data to a web server. Being both ...

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