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  • Weirdo baud rates should work, per page 791-792 of this massive tome: http://www.st.com/web/en/resource/techni­cal/document/reference_manual/CD00171190­.pdf

    There's clearly no support for a TX_EN exposed in Espruino, and a brief (hah) reading of that section seems to indicate there is no such functionality available in the hardware either (same section of that monstrosity). They have CTS and RTS, described on page 808, and you could enable them with appropriate poke()ing.... but neither of them look like what you're looking for.

    You could certainly do it in software though.

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