Function pio_dist_to_json 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pio_dist_to_json(
    net: *const PioDistNetwork,
    errbuf: *mut c_char,
    errlen: usize,
) -> *mut c_char

Serialize net to its model JSON: the same object a .pio.json package carries under model.multiconductor_network, without the surrounding document. This is the bindings’ data transport, not a case format: the converter, CLI, and format inference do not know it; distribution cases exchanged with other tools are BMOPF JSON (pio_dist_to_format). Returns an owned C string (free with pio_string_free), NULL on error.