| /* |
| * Copyright (c) 2018 Intel Corporation |
| * Copyright (c) 2023 Basalte bv |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/logging/log.h> |
| LOG_MODULE_DECLARE(net_coap_service_sample); |
| |
| #include <zephyr/kernel.h> |
| #include <zephyr/sys/printk.h> |
| #include <zephyr/net/coap_service.h> |
| |
| static int obs_counter; |
| |
| static void update_counter(struct k_work *work); |
| K_WORK_DELAYABLE_DEFINE(obs_work, update_counter); |
| |
| static int send_notification_packet(struct coap_resource *resource, |
| const struct sockaddr *addr, |
| socklen_t addr_len, |
| uint16_t age, uint16_t id, |
| const uint8_t *token, uint8_t tkl, |
| bool is_response) |
| { |
| uint8_t data[CONFIG_COAP_SERVER_MESSAGE_SIZE]; |
| struct coap_packet response; |
| char payload[14]; |
| uint8_t type; |
| int r; |
| |
| if (is_response) { |
| type = COAP_TYPE_ACK; |
| } else { |
| type = COAP_TYPE_CON; |
| } |
| |
| if (!is_response) { |
| id = coap_next_id(); |
| } |
| |
| r = coap_packet_init(&response, data, sizeof(data), |
| COAP_VERSION_1, type, tkl, token, |
| COAP_RESPONSE_CODE_CONTENT, id); |
| if (r < 0) { |
| return r; |
| } |
| |
| if (age >= 2U) { |
| r = coap_append_option_int(&response, COAP_OPTION_OBSERVE, age); |
| if (r < 0) { |
| return r; |
| } |
| } |
| |
| r = coap_append_option_int(&response, COAP_OPTION_CONTENT_FORMAT, |
| COAP_CONTENT_FORMAT_TEXT_PLAIN); |
| if (r < 0) { |
| return r; |
| } |
| |
| r = coap_packet_append_payload_marker(&response); |
| if (r < 0) { |
| return r; |
| } |
| |
| /* The response that coap-client expects */ |
| r = snprintk((char *) payload, sizeof(payload), |
| "Counter: %d\n", obs_counter); |
| if (r < 0) { |
| return r; |
| } |
| |
| r = coap_packet_append_payload(&response, (uint8_t *)payload, |
| strlen(payload)); |
| if (r < 0) { |
| return r; |
| } |
| |
| k_work_reschedule(&obs_work, K_SECONDS(5)); |
| |
| r = coap_resource_send(resource, &response, addr, addr_len, NULL); |
| |
| return r; |
| } |
| |
| static int obs_get(struct coap_resource *resource, |
| struct coap_packet *request, |
| struct sockaddr *addr, socklen_t addr_len) |
| { |
| uint8_t token[COAP_TOKEN_MAX_LEN]; |
| uint16_t id; |
| uint8_t code; |
| uint8_t type; |
| uint8_t tkl; |
| int r; |
| |
| r = coap_resource_parse_observe(resource, request, addr); |
| |
| 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); |
| |
| LOG_INF("*******"); |
| LOG_INF("type: %u code %u id %u", type, code, id); |
| LOG_INF("*******"); |
| |
| return send_notification_packet(resource, addr, addr_len, |
| r == 0 ? resource->age : 0, |
| id, token, tkl, true); |
| } |
| |
| static void obs_notify(struct coap_resource *resource, |
| struct coap_observer *observer) |
| { |
| send_notification_packet(resource, |
| &observer->addr, |
| sizeof(observer->addr), |
| resource->age, 0, |
| observer->token, observer->tkl, false); |
| } |
| |
| static const char * const obs_path[] = { "obs", NULL }; |
| COAP_RESOURCE_DEFINE(obs, coap_server, |
| { |
| .get = obs_get, |
| .path = obs_path, |
| .notify = obs_notify, |
| }); |
| |
| static void update_counter(struct k_work *work) |
| { |
| obs_counter++; |
| |
| coap_resource_notify(&obs); |
| |
| k_work_reschedule(&obs_work, K_SECONDS(5)); |
| } |