Function om_variable_write_scalar 

pub unsafe extern "C" fn om_variable_write_scalar(
    dst: *mut c_void,
    name_size: u16,
    children_count: u32,
    children_offsets: *const u64,
    children_sizes: *const u64,
    name: *const c_char,
    data_type: OmDataType_t,
    value: *const c_void,
)

Write a scalar variable with name and children variables