add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# md5 from https://pypi.python.org/pypi/hpack/json, sha256 locally computed
md5    556b0ae66180f54c2ce8029a0952088b  hpack-3.0.0.tar.gz
sha256    8eec9c1f4bfae3408a3f30500261f7e6a65912dc138526ea054f9ad98892e9d2  hpack-3.0.0.tar.gz