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oma-lwm2m: Add functionality to send object instance list as core link format

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This commit is contained in:
Joakim Nohlgård 2016-05-24 19:16:33 +02:00
parent 3a34b1f695
commit 84cd7a4e92
1 changed files with 48 additions and 0 deletions
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48
apps/oma-lwm2m/lwm2m-engine.c
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@ -585,6 +585,37 @@ get_resource(const lwm2m_instance_t *instance, lwm2m_context_t *context)
return NULL;
}
/*---------------------------------------------------------------------------*/
/**
* @brief Write a list of object instances as a CoRE Link-format list
*/
static int
write_object_instances_link(const lwm2m_object_t *object,
char *buffer, size_t size)
{
const lwm2m_instance_t *instance;
int len, rdlen, i;
PRINTF("</%d>", object->id);
rdlen = snprintf(buffer, size, "</%d>",
object->id);
if(rdlen < 0 || rdlen >= size) {
return -1;
}
for(i = 0; i < object->count; i++) {
instance = &object->instances[i];
PRINTF(",</%d/%d>", object->id, instance->id);
len = snprintf(&buffer[rdlen], size - rdlen,
",<%d/%d>", object->id, instance->id);
rdlen += len;
if(len < 0 || rdlen >= size) {
return -1;
}
}
return rdlen;
}
/*---------------------------------------------------------------------------*/
static int
write_rd_link_data(const lwm2m_object_t *object,
const lwm2m_instance_t *instance,
@ -992,6 +1023,23 @@ lwm2m_engine_handler(const lwm2m_object_t *object,
REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
}
}
} else if(depth == 1) {
/* produce a list of instances */
if(method != METHOD_GET) {
REST.set_response_status(response, METHOD_NOT_ALLOWED_4_05);
} else {
int rdlen;
PRINTF("Sending instance list for object %u\n", object->id);
/* TODO: if(accept == APPLICATION_LINK_FORMAT) { */
rdlen = write_object_instances_link(object, (char *)buffer, preferred_size);
if(rdlen < 0) {
PRINTF("Failed to generate object response\n");
REST.set_response_status(response, SERVICE_UNAVAILABLE_5_03);
return;
}
REST.set_header_content_type(response, REST.type.APPLICATION_LINK_FORMAT);
REST.set_response_payload(response, buffer, rdlen);
}
}
}
/*---------------------------------------------------------------------------*/