Telnet with 3 W5500 Servers and 1 W5500 Client - Failure to Connect to Switch

Question

Hi Everybody, This is my first post here. I spent some hours looking for a solution to this and was unable to find a configuration where there were 3 (more than one) listening servers and 1 client. The client sends out information to one of the 3 servers depending on where in a machine it is. The client gets its information over I2C and then converts it to a LAN and then after it is received, it converts back to I2C. I was really struggling with long I2C lines and all that is bad about that. This solution works but in the morning when the machine is started, one of the servers fails to connect to the switch. If I open the cover and hit the reset button, it will connect and work. I tried to add in a watchdog to reboot if there is a disconnected cable but after a failed boot, a hard reset is the only thing that works. I have thought about moving to a more robust watchdog but I really want to understand the root cause. I have tried assigning a different port to each server but that was no better. Here is a giff of the connection led (on the right sheild): And my Server Code: /* DHCP Chat Server WILL RECEIVE INFO FROM CLIENT A simple server that distributes any incoming messages to all connected clients. To use, telnet to your device's IP address and type. You can see the client's input in the serial monitor as well. Using an Arduino Wiznet Ethernet shield. Circuit: * Ethernet shield attached to pins 10, 11, 12, 13 created 21 May 2011 modified 9 Apr 2012 by Tom Igoe modified 02 Sept 2015 by Arturo Guadalupi Based on ChatServer example by David A. Mellis */ #include #include #include #include // Enter a MAC address and IP address for your controller below. // The IP address will be dependent on your local network. // gateway and subnet are optional: byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; IPAddress ip(192, 168, 1, 187); //IPAddress myDns(192, 168, 1, 1); //IPAddress gateway(192, 168, 1, 1); IPAddress subnet(255, 255, 0, 0); // telnet defaults to port 23 EthernetServer server(23); //port 23 is default for telnet services boolean gotAMessage = false; // whether or not you got a message from the client yet int StationNumber = 0; int UOSgoSteps = 0; int UGSgoSteps = 0; int LOSgoSteps = 0; int LGSgoSteps = 0; byte byteRcvd0 = 0; byte byteRcvd1 = 0; byte byteRcvd2 = 0; byte byteRcvd3 = 0; byte byteRcvd4 = 0; void reboot() { wdt_disable(); wdt_enable(WDTO_15MS); while (1) {} } void setup() { Serial.begin(9600); Wire.begin(); pinMode(4, OUTPUT); digitalWrite(4,HIGH); //Turn off SD Card // You can use Ethernet.init(pin) to configure the CS pin Ethernet.init(10); // Most Arduino shields //Ethernet.init(5); // MKR ETH shield //Ethernet.init(0); // Teensy 2.0 //Ethernet.init(20); // Teensy++ 2.0 //Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet //Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet // start the Ethernet connection: Ethernet.begin(mac, ip); if…

dkay · Answer

HI, G_Johanson. In the code, Subnet mask is 255.255.0.0. This is Class B network. If you want to use (192.168.X.X) IP address, Subnet mask must be set 255.255.255.0 And Did you set different IP address each W5500? The IP address and MAC address must be different for each W5500 chip. If the problem is not resolved, please contact us again. Thank you.

G_Johanson · Answer

Hi dkay! Thanks for the reply. I will change the subnet and report back. I do have a different IP and MAC address for each. This morning I had 2/3 of the ones on my desk not work so this is a duplicatable issue. Thanks! Gary

G_Johanson · Answer

Hi dkay, I did a test with the 255.255.255.0 subnet and one of them did not start up (same issue). Is there anything else I should look out for? Thanks, Gary

G_Johanson · Answer

The IP is ok. All 3 are different and within spec. I have had one or two fail upon startup and not always the same one. This morning all started ok. The next time, perhaps not. Can you let me know what the state of leds means? Where they both flash in sequence (as in the giff)? Here is the client code: /* Telnet client This sketch connects to a a telnet server (http://www.google.com) using an Arduino Wiznet Ethernet shield. You'll need a telnet server to test this with. Processing's ChatServer example (part of the network library) works well, running on port 10002. It can be found as part of the examples in the Processing application, available at http://processing.org/ Circuit: * Ethernet shield attached to pins 10, 11, 12, 13 created 14 Sep 2010 modified 9 Apr 2012 by Tom Igoe */ #include #include #include // Enter a MAC address and IP address for your controller below. // The IP address will be dependent on your local network: byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x05 }; IPAddress ip(192, 168, 1, 178); IPAddress subnet(255, 255, 255, 0); // Enter the IP address of the server you're connecting to: IPAddress server123(192, 168, 1, 177); IPAddress server456(192, 168, 1, 187); IPAddress server789(192, 168, 1, 197); // Initialize the Ethernet client library // with the IP address and port of the server // that you want to connect to (port 23 is default for telnet; // if you're using Processing's ChatServer, use port 10002): EthernetClient client; int StationNumber = 0; int UOSgoSteps = 0; int UGSgoSteps = 0; int LOSgoSteps = 0; int LGSgoSteps = 0; byte byteRcvd0 = 0; byte byteRcvd1 = 0; byte byteRcvd2 = 0; byte byteRcvd3 = 0; byte byteRcvd4 = 0; char c; void setup() { delay(10000); Wire.begin(40); Wire.onReceive(StartMoving); // You can use Ethernet.init(pin) to configure the CS pin Ethernet.init(10); // Most Arduino shields //Ethernet.init(5); // MKR ETH shield //Ethernet.init(0); // Teensy 2.0 //Ethernet.init(20); // Teensy++…

dkay · Answer

Loop means while in C. In the Client code, the loop function is empty. Function “StartMoving” is used once in setup function. Is it right operation you intended? If you want to use your operation repeatably, you must design loop function correctly. Also, I think “StartMoving” function is worked before “Ethernet.begin”. And after “Ethernet.begin”, there is no operation about network communication. After setting the network information, try to connect to the TCP server Here is a reference code for Telnet client, docs.arduino.cc Ethernet Shield Telnet Client | Arduino Documentation This example connects to a Telnet server using an Ethernet shield. Thank you.

G_Johanson · Answer

I see what you mean. The code works though. I believe the wire library manages “Wire.onReceive(StartMoving);”. It does work when I send a i2c command to the client (every time). The main function of this client is translating i2c to lan. I did move the “Wire.onReceive(StartMoving);” to the “void loop()” as you have suggested. I also moved some of the code from “StartMoving()” to the loop. It seems to be running better. I will give it a bit and report back. Thanks for you input! Here is the code again: /* Telnet client This sketch connects to a a telnet server (http://www.google.com) using an Arduino Wiznet Ethernet shield. You'll need a telnet server to test this with. Processing's ChatServer example (part of the network library) works well, running on port 10002. It can be found as part of the examples in the Processing application, available at http://processing.org/ Circuit: * Ethernet shield attached to pins 10, 11, 12, 13 created 14 Sep 2010 modified 9 Apr 2012 by Tom Igoe */ #include #include #include // Enter a MAC address and IP address for your controller below. // The IP address will be dependent on your local network: byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x05 }; IPAddress ip(192, 168, 1, 178); IPAddress subnet(255, 255, 255, 0); // Enter the IP address of the server you're connecting to: IPAddress server123(192, 168, 1, 177); IPAddress server456(192, 168, 1, 187); IPAddress server789(192, 168, 1, 197); // Initialize the Ethernet client library // with the IP address and port of the server // that you want to connect to (port 23 is default for telnet; // if you're using Processing's ChatServer, use port 10002): EthernetClient client; int StationNumber = 0; int UOSgoSteps = 0; int UGSgoSteps = 0; int LOSgoSteps = 0; int LGSgoSteps = 0; byte byteRcvd0 = 0; byte byteRcvd1 = 0; byte byteRcvd2 = 0; byte byteRcvd3 = 0; byte byteRcvd4 = 0; char c; void setup() { delay(10000); Wire.begin(40); // You can use…

G_Johanson · Answer

No success. Upon booting (turning on the power supply) I have the same issue. The client does seem more prone to fail on boot. If I press the reset on the shield, nothing changes but after resetting the UNO it will do a steady green. Thanks, Gary

G_Johanson · Answer

Ok. I have done as you suggested and have had a fail. In this case, I loaded the same sketch onto all 3 on my desk, careful to change the mac and IP addresses. I removed the network wires from 2 of them and turned on the power. The leds blinked in sequence as before (giff below). I disconnected the network wire and moved it to the other ones, one at a time and one of the others had the same fail. So I believe this issue has more to do with a failed Adruino boot up. Once I press reset, all is ok. Do you think the shield is holding a pin low (or high) during boot up and making the issue more likely? I just don’t know… Thanks! Gary

G_Johanson · Answer

Hello again! Further to the above, I have added a full watchdog and monitored a pin on the Arduino and it seems it is running and did boot ok. (giff attached) This only further confuses me. Thanks, Gary

dkay · Answer

Hi, Gary. There’s no holding situation from Ethernet shield. It’s not general situation. I doubt your network environment. I am testing the W5500 ethernet shield, I can’t make situation like you. Please change your LAN cable or check the hub or router works well. W5500 supports 10/100 Mbps ethernet. Separately, you wrote code “Ethernet.begin(mac, ip, subnet);”. But your “subnet” value sets DNS server IP. check syntax. image949×483 33 KB Thanks, DKay