pub unsafe extern "C" fn reefnet_sensusultra_device_read_user(
device: *mut dc_device_t,
data: *mut c_uchar,
size: c_uint,
) -> dc_status_tpub unsafe extern "C" fn reefnet_sensusultra_device_read_user(
device: *mut dc_device_t,
data: *mut c_uchar,
size: c_uint,
) -> dc_status_t