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Is there one for RP2350?

Not in esp32sim - but I also happen to have Cooja-NG there we do have both RISC-V + ARM Cortex M33 - so it would not be hopeless to get that emulated.

It would be great fun.

Try it: https://mikroverk.github.io/cooja-ng/ Code (BSD-3): https://github.com/mikroverk/cooja-ng

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