Function moq_publish_json 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn moq_publish_json(
    broadcast: u32,
    name: *const c_char,
    name_len: usize,
    config: *const moq_json_config,
) -> i32

Create a JSON snapshot track (lossy latest-value) on a broadcast.

Values published via moq_publish_json_update reach subscribers as a single latest state; a late joiner only sees the newest. Advertise the track in the catalog with moq_publish_catalog_section if consumers should discover it.

Returns a non-zero handle to the JSON producer on success, or a negative code on failure.

Safety

• The caller must ensure name is a valid pointer to name_len bytes and config a valid pointer.