It can be done exactly as passing a void* when registering a C callback, and getting it passed back to your callback function. https://cffi.readthedocs.io/en/latest/ref.html#ffi-new-handle-ffi-from-handle
https://bitbucket.org/dholth/kivyjoy/src/aaeab79b2891782209a1219cd65a4d9716cea669/kivyjoy/controller.py#lines-49 https://bitbucket.org/dholth/kivyjoy/src/aaeab79b2891782209a1219cd65a4d9716cea669/kivyjoy/__init__.py#lines-15
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