![]() Serial.println("Starting UDP crash test program. While (!Serial) // wait for serial port to connect. Open serial communications and wait for port to open: Enter a MAC address and IP address for your controller below.īyte mac = The W5x00 and the traffic halts permananently until both the W5x00 and Arduino is reset This sketch should be run in two or more instances connected to the same LAN using aĪfter some minutes / hundreds of thousands of packets, it ususally triggers a failure of Code to trigger the failure:īased on Ethernet example UDPSendReceiveString. Software environmentĪrduino IDE 1.8.9 running on Windows 10 Hardware environmentĪrduino Uno with the good version of the W5100 on-top netork shield, or Uno or Nano with the red small W5100 based network card or the small blue W5500 based network card. In my case with data exchange between multiple devices every 10 seconds. But this is only to quickly catch the error that will occur after a much longer time in normal use. The program is trying to send a packet every millisecond, not a realistic scenario. After some minutes one of the devices stop printing and the other will print 0 packets received from then on. ![]() This version only offers minimal wrapping of socket.c/socket.h Drop. Flash the sketch to both Arduinos, modifying the MAC address for one of them before flashing.Įvery 10 seconds each of the two Arduinos write a line telling how many packets it sends and receives. Udp.cpp: Library to send/receive UDP packets with the Arduino ethernet shield. Connect two Arduino Unos with a W5x00 based Ethernet shield each with USB to the PC, then start up two instances of Arduino IDE connected to one Arduino each, both with the serial monitor open at 115200bps. I tried to speed up the process of triggering a freeze, and the attached program UDPCrash_nolibmod.ino does it within 1-30 minutes. This sounds similar to the TCP issue where the W5x00 receives while trying to send: It is waiting for SEND_OK, and will also exit if it gets TIMEOUT, but in my case it gets a RECEIVE. Having searched for the cause of this by printouts and patience I found that it is always stuck in an eternal loop in socket.cpp, in the EthernetClass::socketSendUDP function. I seem to be sending exactly what I think I am. When I send this packet, I can confirm it through Wireshark on my PC. and I've updated the Arduino code to reflect that. This may take days or multiple weeks to happen but is nevertheless catastrophic. THISIPADDRESS 192.168.121.1 ARDUINOIPADDRESS 192.168.121.2 SENDPORT 8888 RECEIVEPORT 32001. This works fine except for that from time to time a random device will lock up and stop responding permanently. I have a protocol that uses UDP broadcast to let devices communicate.
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