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Recently needed multi-threading with Arduino. Going to give this a shot. I'm sure people more well-versed with non-POSIX may have gripes, but I'm just doing this for hobby purposes. I'm familiar with Linux, I need multi-threading and maybe a network stack. Given that, this seems like the thing for me.

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I also recommend taking a look at Zephyr RTOS [1].

I've been using it in production for almost a year, and no major complaints so far. There seems to have support for POSIX threads and BSD sockets, but I don't use them, so I can't tell you if they are production-ready or not.

[1]: https://www.zephyrproject.org/

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