Teensy 4.1 strange ethernet behaviour

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damo1976

Well-known member
Hi all. I have a strange issue I am unsure how to resolve.

I have a custom UDP broadcast transmission and reception that works fine when the Teensy 4.1 is connected via USB. I am able to see the UDP broadcast reception and teensy response via the serial monitor and everything works fine.

However, when I disconnect the USB from the teensy 4.1 and use external power (5V via 5V pin), the Teensy does not seem to respond to the UDP. All the other parts of the code work though. Im a bit lost on how to even troubleshoot this.

No other changes are made except for changing the teensy power source from 5V usb to 5v external.

Any advice appreciated

Damien
 
Common cause for this is in setup() some sort of: while( !Serial ){}

Not seeing the code or having any idea of what library or other is in use makes guessing beyond that tough ...
 
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