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net: lwm2m: Introduce attribute handling helper functions

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Introduce LwM2M engine helper functions that allows to work with LwM2M
attributes outside of lwm2m_engine.c.

This is a groundwork for application/lwm2m-format content writer.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
This commit is contained in:
Robert Lubos 2021-01-27 14:31:26 +01:00 • committed by Carles Cufí
commit d53fb5700d
3 changed files with 88 additions and 0 deletions
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69
subsys/net/lib/lwm2m/lwm2m_engine.c
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@ -1367,6 +1367,37 @@ static int path_to_objs(const struct lwm2m_obj_path *path,
return 0;
}
struct lwm2m_attr *lwm2m_engine_get_next_attr(const void *ref,
struct lwm2m_attr *prev)
{
struct lwm2m_attr *iter = (prev == NULL) ? write_attr_pool : prev + 1;
struct lwm2m_attr *result = NULL;
if (!PART_OF_ARRAY(write_attr_pool, iter)) {
return NULL;
}
while (iter < &write_attr_pool[ARRAY_SIZE(write_attr_pool)]) {
if (ref == iter->ref) {
result = iter;
break;
}
++iter;
}
return result;
}
const char *lwm2m_engine_get_attr_name(const struct lwm2m_attr *attr)
{
if (attr->type >= NR_LWM2M_ATTR) {
return NULL;
}
return LWM2M_ATTR_STR[attr->type];
}
int lwm2m_engine_create_obj_inst(char *pathstr)
{
struct lwm2m_obj_path path;
@ -3486,6 +3517,44 @@ int lwm2m_get_or_create_engine_obj(struct lwm2m_message *msg,
return ret;
}
struct lwm2m_engine_obj *lwm2m_engine_get_obj(
const struct lwm2m_obj_path *path)
{
if (path->level < LWM2M_PATH_LEVEL_OBJECT) {
return NULL;
}
return get_engine_obj(path->obj_id);
}
struct lwm2m_engine_obj_inst *lwm2m_engine_get_obj_inst(
const struct lwm2m_obj_path *path)
{
if (path->level < LWM2M_PATH_LEVEL_OBJECT_INST) {
return NULL;
}
return get_engine_obj_inst(path->obj_id, path->obj_inst_id);
}
struct lwm2m_engine_res *lwm2m_engine_get_res(
const struct lwm2m_obj_path *path)
{
struct lwm2m_engine_res *res = NULL;
int ret;
if (path->level < LWM2M_PATH_LEVEL_RESOURCE) {
return NULL;
}
ret = path_to_objs(path, NULL, NULL, &res, NULL);
if (ret < 0) {
return NULL;
}
return res;
}
static int do_write_op(struct lwm2m_message *msg,
uint16_t format)
{