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Updating the reset sequence fixed the problem! I looked at Paul's instructions in the wayback machine, and found the code fragment that I was using. I didn't catch that it had changed. Thank you!

As you suggested, I upgraded to Arduino 1.8.3 and TeensyDuino 1.37, but it still doesn't work. In fact, it is actually worse. When the Teensy starts up, the lights on the Wiz820IO ethernet jack will blink 5 or 6 times, then go out and never blink again. I stripped down the sketch to the...

I am also running Paul's latest released Ethernet v1.1.1 driver from here: https://github.com/PaulStoffregen/Ethernet/releases/. I now notice the later updates to EthernetUDP.* to "fix teensy multicast" in the "errata" branch. How would I grab those fixes? Do I need to pull that branch and...

I am running Arduino 1.8.1 with TeensyDuino 1.35.

I'm using Teensy 3.2 with an Wiz820IO and cannot receive UDP multicast messages. I am trying to receive UDP multicasts from 239.192.0.1 on port 853, but get no packets. During setup(): EthernetUDP udp; IPAddress multicast_ip(239,192,0,1); Ethernet.begin( my_mac, my_ip, my_gateway...

I am using a Teensy 3.2 with Wiz820IO in a server/client socket application. Is it possible to force any written data to be immediately transmitted? My code uses the Arduino (TeensyDuino) Ethernet class, which appears to offer only these three output mechanisms for a client: write()...

It turns out that it was some kind of NIC driver problem. I downgraded the network card driver to a more basic one, and it started working. I suspect the issue might have to do with TCP SACK which is known to confuse some network stacks, but I have no proof. I tried a network search to see...

Might be a NIC problem... ChatServer connection from a different (Linux) PC works. Using Arduino 1.6.5. The Wiz820IO adapter SD card slot is empty. Libraries (from verbose): Using library SPI in folder: C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\SPI (1.0.x format) Using...

T3MAC tried, but didn't help. I think it should be OK to use the hardcoded "DEAD BEEF FEED" MAC address because the upper byte (DE) has bit 1 set and bit 0 clear, for a unicast locally administered MAC address, but I tried using your suggestion of using T3MAC. T3MAC broke the project...

I built a combo of a Teensy 3.2 and Wiz820IO module using the PJRC adapter board. I had the webserver demo running at one time, then catastrophe struck and my PC was wiped out. I rebuilt the Arduino environment that I thought I needed on a new PC, but I cannot get the WebServer demo to work...

Is the source code for the Teensy serial driver installer available, or are there command-line options to change the default USB vendor ID and product ID? I want to change the VID/PID used by the USB connection of the Teensy, and need to somehow alter the driver installation to use the new...

I am trying to put a B&B USB server (ethernet) between two Teensy 2.0++ USB devices and my Windows PC. The server thinks the USB serial connection is a "camera", probably because of some default handling of VID/PID values. The server driver refuses to allow any more than one "camera" to be...

I'm using Teensy 2.0++ with the usb_serial 1.7 example. Has anyone modified that usb_serial example code to allow the serial number to come out of RAM instead of regular program memory? I plan to use EEPROM to hold a serial number so that it can be reprogrammed for each device, and will read it...