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coap-server.c
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coap-server.c
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/*
* Copyright (c) 2016 Intel Corporation
* Modified by Fraunhofer AISEC, see the COPYRIGHT file
* at the top-level directory of this distribution for
* a list of all changes.
*
* SPDX-License-Identifier: Apache-2.0
*/
#if 1
#define SYS_LOG_DOMAIN "coap-server"
#define SYS_LOG_LEVEL SYS_LOG_LEVEL_DEBUG
#define NET_LOG_ENABLED 1
#endif
#include <errno.h>
#include <misc/printk.h>
#include <zephyr.h>
#include <misc/byteorder.h>
#include <misc/util.h>
#include <net/buf.h>
#include <net/net_pkt.h>
#include <net/net_ip.h>
#include <net/udp.h>
#include <net/coap.h>
#include <net/coap_link_format.h>
#include "net_private.h"
#include "resources.h"
#include "../oscore/options.h"
#include "../oscore/coap-uri.h"
#include "../oscore/oscore.h"
#include "../util/macros.h"
#define MY_COAP_PORT 5683
#define STACKSIZE 2000
/* FIXME */
#define BLOCK_WISE_TRANSFER_SIZE_GET 2048
#define ALL_NODES_LOCAL_COAP_MCAST \
{ { { 0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xfd } } }
#define MY_IP6ADDR \
{ { { 0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1 } } }
#define NUM_OBSERVERS 3
#define NUM_PENDINGS 3
/* block option helper */
#define GET_BLOCK_NUM(v) ((v) >> 4)
#define GET_BLOCK_SIZE(v) (((v) & 0x7))
#define GET_MORE(v) (!!((v) & 0x08))
struct net_context *context;
static const u8_t plain_text_format;
static struct coap_observer observers[NUM_OBSERVERS];
static struct coap_pending pendings[NUM_PENDINGS];
static struct k_delayed_work observer_work;
static int obs_counter;
static struct coap_resource *resource_to_notify;
struct k_delayed_work retransmit_work;
void get_from_ip_addr(struct coap_packet *cpkt,
struct sockaddr_in6 *from)
{
struct net_udp_hdr hdr, *udp_hdr;
udp_hdr = net_udp_get_hdr(cpkt->pkt, &hdr);
if (!udp_hdr) {
return;
}
net_ipaddr_copy(&from->sin6_addr, &NET_IPV6_HDR(cpkt->pkt)->src);
from->sin6_port = udp_hdr->src_port;
from->sin6_family = AF_INET6;
}
int well_known_core_get(struct coap_resource *resource,
struct coap_packet *request)
{
struct coap_packet response;
struct sockaddr_in6 from;
struct net_pkt *pkt;
struct net_buf *frag;
int r;
NET_DBG("");
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
r = coap_well_known_core_get(resource, request, &response, pkt);
if (r < 0) {
net_pkt_unref(response.pkt);
return r;
}
get_from_ip_addr(request, &from);
r = net_context_sendto(response.pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
if (r < 0) {
net_pkt_unref(response.pkt);
}
return r;
}
static void payload_dump(const char *s, struct net_buf *frag,
u16_t offset, u16_t len)
{
printk("payload message = %s [%u]\n", s, len);
while (frag) {
_hexdump(frag->data + offset, frag->len - offset, 0);
frag = frag->frags;
offset = 0;
}
}
int test_del(struct coap_resource *resource,
struct coap_packet *request)
{
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t tkl, code, type;
u8_t token[8];
u16_t id;
int r;
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
if (type == COAP_TYPE_CON) {
type = COAP_TYPE_ACK;
} else {
type = COAP_TYPE_NON_CON;
}
r = coap_packet_init(&response, pkt, 1, type,
tkl, (u8_t *)token,
COAP_RESPONSE_CODE_DELETED, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
int test_put(struct coap_resource *resource,
struct coap_packet *request)
{
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t code, type, tkl;
u8_t token[8];
u16_t id;
int r;
struct net_buf *payloadfrag;
u16_t offset;
u16_t len;
/* TODO: Check for payload, empty payload is an error case. */
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("\n ****** test put method *******\n");
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
payloadfrag = coap_packet_get_payload(request, &offset, &len);
if (!payloadfrag && len == 0xffff) {
NET_ERR("Invalid payload");
return -EINVAL;
} else if (!payloadfrag && !len) {
NET_INFO("Packet without payload\n");
goto next;
}
payload_dump("put_payload", payloadfrag, offset, len);
next:
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
if (type == COAP_TYPE_CON) {
type = COAP_TYPE_ACK;
} else {
type = COAP_TYPE_NON_CON;
}
r = coap_packet_init(&response, pkt, 1, type,
tkl, (u8_t *)token,
COAP_RESPONSE_CODE_CHANGED, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
int test_post(struct coap_resource *resource,
struct coap_packet *request)
{
static const char * const location_path[] = { "location1",
"location2",
"location3",
NULL };
const char * const *p;
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t code, type, tkl;
u8_t token[8];
u16_t id;
int r;
struct net_buf *payloadfrag;
u16_t offset;
u16_t len;
/* TODO: Check for payload, empty payload is an error case. */
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("\n ****** test post method *******\n");
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
payloadfrag = coap_packet_get_payload(request, &offset, &len);
if (!payloadfrag && len == 0xffff) {
NET_ERR("Invalid payload");
return -EINVAL;
} else if (!payloadfrag && !len) {
NET_INFO("Packet without payload\n");
goto next;
}
payload_dump("post_payload", payloadfrag, offset, len);
next:
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
if (type == COAP_TYPE_CON) {
type = COAP_TYPE_ACK;
} else {
type = COAP_TYPE_NON_CON;
}
r = coap_packet_init(&response, pkt, 1, type,
tkl, (u8_t *)token,
COAP_RESPONSE_CODE_CREATED, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
for (p = location_path; *p; p++) {
r = coap_packet_append_option(&response,
COAP_OPTION_LOCATION_PATH,
*p, strlen(*p));
if (r < 0) {
return -EINVAL;
}
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
int location_query_post(struct coap_resource *resource,
struct coap_packet *request)
{
static const char *const location_query[] = { "first=1",
"second=2",
NULL };
const char * const *p;
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t code, type, tkl;
u8_t token[8];
u16_t id;
int r;
/* TODO: Check for payload, empty payload is an error case. */
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
if (type == COAP_TYPE_CON) {
type = COAP_TYPE_ACK;
} else {
type = COAP_TYPE_NON_CON;
}
r = coap_packet_init(&response, pkt, 1, type,
tkl, (u8_t *)token,
COAP_RESPONSE_CODE_CREATED, id);
if (r < 0) {
return -EINVAL;
}
for (p = location_query; *p; p++) {
r = coap_packet_append_option(&response,
COAP_OPTION_LOCATION_QUERY,
*p, strlen(*p));
if (r < 0) {
return -EINVAL;
}
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
int piggyback_get(struct coap_resource *resource,
struct coap_packet *request)
{
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t token[8];
u8_t payload[40], code, type;
u16_t id;
u8_t tkl;
int r;
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
if (type == COAP_TYPE_CON) {
type = COAP_TYPE_ACK;
} else {
type = COAP_TYPE_NON_CON;
}
r = coap_packet_init(&response, pkt, 1, type,
tkl, (u8_t *)token,
COAP_RESPONSE_CODE_CONTENT, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_option(&response, COAP_OPTION_CONTENT_FORMAT,
&plain_text_format,
sizeof(plain_text_format));
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_payload_marker(&response);
if (r) {
net_pkt_unref(pkt);
return -EINVAL;
}
/* The response that coap-client expects */
r = snprintk((char *) payload, sizeof(payload),
"Type: %u\nCode: %u\nMID: %u\n", type, code, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_payload(&response, (u8_t *)payload,
strlen(payload));
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
int query_get(struct coap_resource *resource,
struct coap_packet *request)
{
struct coap_option options[4];
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t payload[40], code, type, tkl;
u8_t token[8];
u16_t id;
int i, r;
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
r = coap_find_options(request, COAP_OPTION_URI_QUERY, options, 4);
if (r < 0) {
return -EINVAL;
}
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("num queries: %d\n", r);
for (i = 0; i < r; i++) {
char str[16];
if (options[i].len + 1 > sizeof(str)) {
NET_INFO("Unexpected length of query: "
"%d (expected %zu)\n",
options[i].len, sizeof(str));
break;
}
memcpy(str, options[i].value, options[i].len);
str[options[i].len] = '\0';
NET_INFO("query[%d]: %s\n", i + 1, str);
}
NET_INFO("*******\n");
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
r = coap_packet_init(&response, pkt, 1, COAP_TYPE_ACK,
tkl, (u8_t *) token,
COAP_RESPONSE_CODE_CONTENT, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_option(&response, COAP_OPTION_CONTENT_FORMAT,
&plain_text_format,
sizeof(plain_text_format));
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_payload_marker(&response);
if (r) {
net_pkt_unref(pkt);
return -EINVAL;
}
/* The response that coap-client expects */
r = snprintk((char *) payload, sizeof(payload),
"Type: %u\nCode: %u\nMID: %u\n", type, code, id);
if (r < 0) {
return -EINVAL;
}
r = coap_packet_append_payload(&response, (u8_t *)payload,
strlen(payload));
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
int separate_get(struct coap_resource *resource,
struct coap_packet *request)
{
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
struct coap_pending *pending;
u8_t payload[40], code, type, tkl;
u8_t token[8];
u16_t id;
int r;
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
if (type == COAP_TYPE_NON_CON) {
goto done;
}
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
r = coap_packet_init(&response, pkt, 1, COAP_TYPE_ACK,
tkl, (u8_t *)token, 0, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
done:
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
if (type == COAP_TYPE_CON) {
type = COAP_TYPE_CON;
} else {
type = COAP_TYPE_NON_CON;
}
r = coap_packet_init(&response, pkt, 1, type,
tkl, (u8_t *)token,
COAP_RESPONSE_CODE_CONTENT, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_option(&response, COAP_OPTION_CONTENT_FORMAT,
&plain_text_format,
sizeof(plain_text_format));
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_payload_marker(&response);
if (r) {
net_pkt_unref(pkt);
return -EINVAL;
}
/* The response that coap-client expects */
r = snprintk((char *) payload, sizeof(payload),
"Type: %u\nCode: %u\nMID: %u\n", type, code, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_payload(&response, (u8_t *)payload,
strlen(payload));
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
if (type == COAP_TYPE_CON) {
pending = coap_pending_next_unused(pendings, NUM_PENDINGS);
if (!pending) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_pending_init(pending, &response,
(const struct sockaddr *)&from);
if (r) {
net_pkt_unref(pkt);
return -EINVAL;
}
coap_pending_cycle(pending);
pending = coap_pending_next_to_expire(pendings, NUM_PENDINGS);
k_delayed_work_submit(&retransmit_work, pending->timeout);
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
int large_get(struct coap_resource *resource,
struct coap_packet *request)
{
static struct coap_block_context ctx;
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t token[8], code, type;
u8_t payload[64];
u16_t size;
u16_t id;
u8_t tkl;
int r;
if (ctx.total_size == 0) {
coap_block_transfer_init(&ctx, COAP_BLOCK_64,
BLOCK_WISE_TRANSFER_SIZE_GET);
}
r = coap_update_from_block(request, &ctx);
if (r < 0) {
return -EINVAL;
}
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
r = coap_packet_init(&response, pkt, 1, COAP_TYPE_ACK,
tkl, (u8_t *) token,
COAP_RESPONSE_CODE_CONTENT, id);
if (r < 0) {
return -EINVAL;
}
r = coap_packet_append_option(&response, COAP_OPTION_CONTENT_FORMAT,
&plain_text_format,
sizeof(plain_text_format));
if (r < 0) {
return -EINVAL;
}
r = coap_append_block2_option(&response, &ctx);
if (r < 0) {
return -EINVAL;
}
r = coap_packet_append_payload_marker(&response);
if (r) {
net_pkt_unref(pkt);
return -EINVAL;
}
size = min(coap_block_size_to_bytes(ctx.block_size),
ctx.total_size - ctx.current);
memset(payload, 'A', size);
r = coap_packet_append_payload(&response, (u8_t *)payload, size);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_next_block(&response, &ctx);
if (!r) {
/* Will return 0 when it's the last block. */
memset(&ctx, 0, sizeof(ctx));
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
static int get_option_int(const struct coap_packet *pkt, u8_t opt)
{
struct coap_option option = {};
int r;
r = coap_find_options(pkt, opt, &option, 1);
if (r <= 0) {
return -ENOENT;
}
return coap_option_value_to_int(&option);
}
int large_update_put(struct coap_resource *resource,
struct coap_packet *request)
{
static struct coap_block_context ctx;
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t token[8];
u16_t len, id, offset;
u8_t code;
u8_t type;
u8_t tkl;
int r;
bool last_block;
r = get_option_int(request, COAP_OPTION_BLOCK1);
if (r < 0) {
return -EINVAL;
}
last_block = !GET_MORE(r);
/* initialize block context upon the arrival of first block */
if (!GET_BLOCK_NUM(r)) {
coap_block_transfer_init(&ctx, COAP_BLOCK_64, 0);
}
r = coap_update_from_block(request, &ctx);
if (r < 0) {
NET_ERR("Invalid block size option from request");
return -EINVAL;
}
frag = coap_packet_get_payload(request, &offset, &len);
if (!last_block && frag == NULL && len == 0) {
NET_ERR("Packet without payload\n");
return -EINVAL;
}
NET_INFO("**************\n");
NET_INFO("[ctx] current %u block_size %u total_size %u\n",
ctx.current, coap_block_size_to_bytes(ctx.block_size),
ctx.total_size);
NET_INFO("**************\n");
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
/* Do something with the payload */
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
if (!last_block) {
code = COAP_RESPONSE_CODE_CONTINUE;
} else {
code = COAP_RESPONSE_CODE_CHANGED;
}
r = coap_packet_init(&response, pkt, 1, COAP_TYPE_ACK,
tkl, (u8_t *) token, code, id);
if (r < 0) {
return -EINVAL;
}
r = coap_append_block1_option(&response, &ctx);
if (r < 0) {
NET_ERR("Could not add Block1 option to response");
return -EINVAL;
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
int large_create_post(struct coap_resource *resource,
struct coap_packet *request)
{
static struct coap_block_context ctx;
struct net_pkt *pkt;
struct net_buf *frag;
struct sockaddr_in6 from;
struct coap_packet response;
u8_t token[8];
u8_t code, type;
u16_t len, id, offset;
u8_t tkl;
int r;
bool last_block;
r = get_option_int(request, COAP_OPTION_BLOCK1);
if (r < 0) {
return -EINVAL;
}
last_block = !GET_MORE(r);
/* initialize block context upon the arrival of first block */
if (!GET_BLOCK_NUM(r)) {
coap_block_transfer_init(&ctx, COAP_BLOCK_32, 0);
}
r = coap_update_from_block(request, &ctx);
if (r < 0) {
NET_ERR("Invalid block size option from request");
return -EINVAL;
}
frag = coap_packet_get_payload(request, &offset, &len);
if (!last_block && frag == NULL && len == 0) {
NET_ERR("Packet without payload\n");
return -EINVAL;
}
get_from_ip_addr(request, &from);
code = coap_header_get_code(request);
type = coap_header_get_type(request);
id = coap_header_get_id(request);
tkl = coap_header_get_token(request, token);
NET_INFO("*******\n");
NET_INFO("type: %u code %u id %u\n", type, code, id);
NET_INFO("*******\n");
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
if (!last_block) {
code = COAP_RESPONSE_CODE_CONTINUE;
} else {
code = COAP_RESPONSE_CODE_CREATED;
}
r = coap_packet_init(&response, pkt, 1, COAP_TYPE_ACK,
tkl, (u8_t *)token, code, id);
if (r < 0) {
return -EINVAL;
}
r = coap_append_block1_option(&response, &ctx);
if (r < 0) {
NET_ERR("Could not add Block1 option to response");
return -EINVAL;
}
return net_context_sendto(pkt, (const struct sockaddr *)&from,
sizeof(struct sockaddr_in6),
NULL, 0, NULL, NULL);
}
static void update_counter(struct k_work *work)
{
obs_counter++;
if (resource_to_notify) {
coap_resource_notify(resource_to_notify);
}
k_delayed_work_submit(&observer_work, 5 * MSEC_PER_SEC);
}
static int send_notification_packet(const struct sockaddr *addr, u16_t age,
socklen_t addrlen, u16_t id,
const u8_t *token, u8_t tkl,
bool is_response)
{
struct coap_packet response;
struct coap_pending *pending;
struct net_pkt *pkt;
struct net_buf *frag;
char payload[14];
u8_t type = COAP_TYPE_CON;
int r;
if (is_response) {
type = COAP_TYPE_ACK;
}
if (!is_response) {
id = coap_next_id();
}
pkt = net_pkt_get_tx(context, K_FOREVER);
frag = net_pkt_get_data(context, K_FOREVER);
net_pkt_frag_add(pkt, frag);
r = coap_packet_init(&response, pkt, 1, type,
tkl, (u8_t *)token,
COAP_RESPONSE_CODE_CONTENT, id);
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
if (age >= 2) {
coap_append_option_int(&response, COAP_OPTION_OBSERVE, age);
}
r = coap_packet_append_option(&response, COAP_OPTION_CONTENT_FORMAT,
&plain_text_format,
sizeof(plain_text_format));
if (r < 0) {
net_pkt_unref(pkt);
return -EINVAL;
}
r = coap_packet_append_payload_marker(&response);
if (r) {
net_pkt_unref(pkt);
return -EINVAL;