add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# Locally computed
sha256  c8c862b0e9a7ba699a49bc98f62bdffdfafd53a5716c0e162696b4bf108d3637  libmodbus-3.1.4.tar.gz