add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# md5 from https://pypi.python.org/pypi/portend/json, sha256 locally computed
md5    a45e001d40227c4529b1a7186f4442f5  portend-1.8.tar.gz
sha256    7de919b82c4ac60d4768fe80a2557290661aa665b7c427de6249d8cb2fde5561  portend-1.8.tar.gz