Re:Ask HN: Is it feasible to build an ESP32 emulator in Java...
by dmonterocrespo on Sunday March 22, 2026 @04:57PM
(#47482057)
Thanks, I didn’t know about Renode.I’ll definitely take a look.
The reason I’m specifically exploring JavaScript is because of a project I’m working on (velxio.dev), where everything runs in the browser, so having a JS/WASM-based approach would make integration much simpler
Right now I’m experimenting with a QEMU based setup and exposing it through WebSockets, but the performance isn’t great and the emulation tends to be unstable (I’ve been hitting crashes under certain workloads).
That’s partly why I’m looking into alternative approaches , either pushing more into the browser, or finding a more robust backend model.
The reason I’m specifically exploring JavaScript is because of a project I’m working on (velxio.dev), where everything runs in the browser, so having a JS/WASM-based approach would make integration much simpler
Right now I’m experimenting with a QEMU based setup and exposing it through WebSockets, but the performance isn’t great and the emulation tends to be unstable (I’ve been hitting crashes under certain workloads).
That’s partly why I’m looking into alternative approaches , either pushing more into the browser, or finding a more robust backend model.
Appreciate the suggestion!