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net: lwm2m: Resource Instance level read access.

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Makes possible to read a single resource instance at a time with
plaint text, JSON and TLV content formats.

Signed-off-by: Veijo Pesonen <veijo.pesonen@nordicsemi.no>
This commit is contained in:
Veijo Pesonen 2022-02-01 13:44:08 +02:00 • committed by Marti Bolivar
commit 2231287e27
3 changed files with 30 additions and 5 deletions
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15
subsys/net/lib/lwm2m/lwm2m_engine.c
View file

@ -2399,6 +2399,12 @@ static int lwm2m_read_handler(struct lwm2m_engine_obj_inst *obj_inst,
continue;
}
if (IS_ENABLED(CONFIG_LWM2M_VERSION_1_1) &&
msg->path.level == LWM2M_PATH_LEVEL_RESOURCE_INST &&
msg->path.res_inst_id != res->res_instances[i].res_inst_id) {
continue;
}
if (res->res_inst_count > 1) {
msg->path.res_inst_id =
res->res_instances[i].res_inst_id;
@ -3496,10 +3502,17 @@ int lwm2m_perform_read_op(struct lwm2m_message *msg, uint16_t content_format)
memcpy(&msg->path, &temp_path, sizeof(temp_path));
/* did not read anything even if we should have - on single item */
if (ret == 0 && num_read == 0U && msg->path.level >= LWM2M_PATH_LEVEL_RESOURCE) {
if (ret == 0 && num_read == 0U) {
if (msg->path.level == LWM2M_PATH_LEVEL_RESOURCE) {
return -ENOENT;
}
if (IS_ENABLED(CONFIG_LWM2M_VERSION_1_1) &&
msg->path.level == LWM2M_PATH_LEVEL_RESOURCE_INST) {
return -ENOENT;
}
}
return ret;
}

6
subsys/net/lib/lwm2m/lwm2m_rw_oma_tlv.c
View file

@ -382,6 +382,12 @@ static int put_end_ri(struct lwm2m_output_context *out,
return -EINVAL;
}
/* Skip writing Multiple Resource TLV if path level is 4 */
if (IS_ENABLED(CONFIG_LWM2M_VERSION_1_1) &&
path->level == LWM2M_PATH_LEVEL_RESOURCE_INST) {
return 0;
}
return put_end_tlv(out, fd->mark_pos_ri, &fd->writer_flags,
WRITER_RESOURCE_INSTANCE,
OMA_TLV_TYPE_MULTI_RESOURCE, path->res_id);

12
subsys/net/lib/lwm2m/lwm2m_rw_plain_text.c
View file

@ -421,9 +421,15 @@ const struct lwm2m_reader plain_text_reader = {
int do_read_op_plain_text(struct lwm2m_message *msg, int content_format)
{
/* Plain text can only return single resource */
if (msg->path.level != 3U) {
return -EPERM; /* NOT_ALLOWED */
/* Plain text can only return single resource (instance) */
if (msg->path.level < LWM2M_PATH_LEVEL_RESOURCE) {
return -EPERM;
} else if (msg->path.level > LWM2M_PATH_LEVEL_RESOURCE) {
if (!IS_ENABLED(CONFIG_LWM2M_VERSION_1_1)) {
return -ENOENT;
} else if (msg->path.level > LWM2M_PATH_LEVEL_RESOURCE_INST) {
return -ENOENT;
}
}
return lwm2m_perform_read_op(msg, content_format);