static void notify_all_led3_subscribers(coap_msg_type_t type)
{
// Fetch all observers which are subscribed to this resource.
// Then send an update value too each observer.
coap_observer_t * p_observer = NULL;
while (coap_observe_server_next_get(&p_observer, p_observer, &m_led3) == NRF_SUCCESS)
{
// Generate a message.
coap_message_conf_t response_config;
memset(&response_config, 0, sizeof(coap_message_conf_t));
response_config.type = type;
response_config.code = COAP_CODE_205_CONTENT;
response_config.response_callback = observer_con_message_callback;
// Copy token.
memcpy(&response_config.token[0], &p_observer->token[0], p_observer->token_len);
// Copy token length.
response_config.token_len = p_observer->token_len;
response_config.port.port_number = COAP_SERVER_PORT;
coap_message_t * p_response;
uint32_t err_code = coap_message_new(&p_response, &response_config);
APP_ERROR_CHECK(err_code);
// Set custom misc. argument.
p_response->p_arg = p_observer;
err_code = coap_message_remote_addr_set(p_response, &p_observer->remote);
APP_ERROR_CHECK(err_code);
err_code = coap_message_opt_uint_add(p_response, COAP_OPT_OBSERVE, m_observer_sequence_num++);
APP_ERROR_CHECK(err_code);
err_code = coap_message_opt_uint_add(p_response, COAP_OPT_MAX_AGE, m_led3.expire_time);
APP_ERROR_CHECK(err_code);
char * response_str;
led_value_get(p_observer->ct, &response_str);
err_code = coap_message_payload_set(p_response, response_str, strlen(response_str));
APP_ERROR_CHECK(err_code);
uint32_t msg_handle;
err_code = coap_message_send(&msg_handle, p_response);
APP_ERROR_CHECK(err_code);
err_code = coap_message_delete(p_response);
APP_ERROR_CHECK(err_code);
}
}
void well_known_core_callback(coap_resource_t * p_resource, coap_message_t * p_request)
{
coap_message_conf_t response_config;
memset(&response_config, 0x00, sizeof(coap_message_conf_t));
if (p_request->header.type == COAP_TYPE_NON)
{
response_config.type = COAP_TYPE_NON;
}
else if (p_request->header.type == COAP_TYPE_CON)
{
response_config.type = COAP_TYPE_ACK;
}
// PIGGY BACKED RESPONSE
response_config.code = COAP_CODE_205_CONTENT;
// Copy message ID.
response_config.id = p_request->header.id;
// Set local port number to use.
response_config.port.port_number = LOCAL_PORT_NUM;
// Copy token.
memcpy(&response_config.token[0], &p_request->token[0], p_request->header.token_len);
// Copy token length.
response_config.token_len = p_request->header.token_len;
coap_message_t * p_response;
uint32_t err_code = coap_message_new(&p_response, &response_config);
APP_ERROR_CHECK(err_code);
err_code = coap_message_remote_addr_set(p_response, &p_request->remote);
APP_ERROR_CHECK(err_code);
memcpy(&p_response->remote, &p_request->remote, sizeof(coap_remote_t));
err_code = coap_message_opt_uint_add(p_response, COAP_OPT_CONTENT_FORMAT, \
COAP_CT_APP_LINK_FORMAT);
APP_ERROR_CHECK(err_code);
err_code = coap_message_payload_set(p_response, m_well_known_core, \
strlen((char *)m_well_known_core));
APP_ERROR_CHECK(err_code);
uint32_t msg_handle;
err_code = coap_message_send(&msg_handle, p_response);
APP_ERROR_CHECK(err_code);
err_code = coap_message_delete(p_response);
APP_ERROR_CHECK(err_code);
}
static void handle_led_request(uint32_t led_mask, coap_message_t * p_request, coap_resource_t * p_resource)
{
coap_message_conf_t response_config;
memset(&response_config, 0x00, sizeof(coap_message_conf_t));
if (p_request->header.type == COAP_TYPE_NON)
{
response_config.type = COAP_TYPE_NON;
}
else if (p_request->header.type == COAP_TYPE_CON)
{
response_config.type = COAP_TYPE_ACK;
}
// PIGGY BACKED RESPONSE
response_config.code = COAP_CODE_405_METHOD_NOT_ALLOWED;
// Copy message ID.
response_config.id = p_request->header.id;
// Set local port number to use.
response_config.port.port_number = LOCAL_PORT_NUM;
// Copy token.
memcpy(&response_config.token[0], &p_request->token[0], p_request->header.token_len);
// Copy token length.
response_config.token_len = p_request->header.token_len;
coap_message_t * p_response;
uint32_t err_code = coap_message_new(&p_response, &response_config);
APP_ERROR_CHECK(err_code);
err_code = coap_message_remote_addr_set(p_response, &p_request->remote);
APP_ERROR_CHECK(err_code);
// Handle request.
switch (p_request->header.code)
{
case COAP_CODE_GET:
{
p_response->header.code = COAP_CODE_205_CONTENT;
// Select the first common content-type between the resource and the CoAP client.
coap_content_type_t ct_to_use;
err_code = coap_message_ct_match_select(&ct_to_use, p_request, p_resource);
if (err_code != NRF_SUCCESS)
{
// None of the accept content formats are supported in this resource endpoint.
p_response->header.code = COAP_CODE_415_UNSUPPORTED_CONTENT_FORMAT;
p_response->header.type = COAP_TYPE_RST;
}
else
{
// Set response payload to actual LED state.
char * response_str;
led_value_get(led_mask, ct_to_use, &response_str);
err_code = coap_message_payload_set(p_response, response_str, strlen(response_str));
APP_ERROR_CHECK(err_code);
}
break;
}
case COAP_CODE_PUT:
{
p_response->header.code = COAP_CODE_204_CHANGED;
// Change LED state according to request.
switch (p_request->p_payload[0])
{
case COMMAND_ON:
{
LEDS_ON(led_mask);
break;
}
case COMMAND_OFF:
{
LEDS_OFF(led_mask);
break;
}
case COMMAND_TOGGLE:
{
LEDS_INVERT(led_mask);
break;
}
default:
{
p_response->header.code = COAP_CODE_400_BAD_REQUEST;
break;
}
}
break;
}
default:
{
p_response->header.code = COAP_CODE_405_METHOD_NOT_ALLOWED;
break;
}
}
uint32_t msg_handle;
err_code = coap_message_send(&msg_handle, p_response);
APP_ERROR_CHECK(err_code);
err_code = coap_message_delete(p_response);
APP_ERROR_CHECK(err_code);
}
static void led3_callback(coap_resource_t * p_resource, coap_message_t * p_request)
{
coap_message_conf_t response_config;
memset (&response_config, 0, sizeof(coap_message_conf_t));
if (p_request->header.type == COAP_TYPE_NON)
{
response_config.type = COAP_TYPE_NON;
}
else if (p_request->header.type == COAP_TYPE_CON)
{
response_config.type = COAP_TYPE_ACK;
}
// PIGGY BACKED RESPONSE
response_config.code = COAP_CODE_405_METHOD_NOT_ALLOWED;
// Copy message ID.
response_config.id = p_request->header.id;
// Copy token.
memcpy(&response_config.token[0], &p_request->token[0], p_request->header.token_len);
// Copy token length.
response_config.token_len = p_request->header.token_len;
coap_message_t * p_response;
uint32_t err_code = coap_message_new(&p_response, &response_config);
APP_ERROR_CHECK(err_code);
err_code = coap_message_remote_addr_set(p_response, &p_request->remote);
APP_ERROR_CHECK(err_code);
// Handle request.
switch (p_request->header.code)
{
case COAP_CODE_GET:
{
p_response->header.code = COAP_CODE_205_CONTENT;
// Select the first common content type between the resource and the CoAP client.
coap_content_type_t ct_to_use;
err_code = coap_message_ct_match_select(&ct_to_use, p_request, p_resource);
if (err_code != NRF_SUCCESS)
{
// None of the accepted content formats are supported in this resource endpoint.
p_response->header.code = COAP_CODE_415_UNSUPPORTED_CONTENT_FORMAT;
p_response->header.type = COAP_TYPE_RST;
}
else
{
if (coap_message_opt_present(p_request, COAP_OPT_OBSERVE) == NRF_SUCCESS)
{
// Locate the option and check the value.
uint32_t observe_option = 0;
uint8_t index;
for (index = 0; index < p_request->options_count; index++)
{
if (p_request->options[index].number == COAP_OPT_OBSERVE)
{
err_code = coap_opt_uint_decode(&observe_option,
p_request->options[index].length,
p_request->options[index].p_data);
if (err_code != NRF_SUCCESS)
{
APP_ERROR_CHECK(err_code);
}
break;
}
}
if (observe_option == 0)
{
// Register observer, and if successful, add the Observe option in the reply.
uint32_t handle;
coap_observer_t observer;
// Set the token length.
observer.token_len = p_request->header.token_len;
// Set the resource of interest.
observer.p_resource_of_interest = p_resource;
// Set the remote.
memcpy(&observer.remote, &p_request->remote, sizeof(coap_remote_t));
// Set the token.
memcpy(observer.token, p_request->token, observer.token_len);
// Set the content format to be used for subsequent notifications.
observer.ct = ct_to_use;
err_code = coap_observe_server_register(&handle, &observer);
if (err_code == NRF_SUCCESS)
{
err_code = coap_message_opt_uint_add(p_response, COAP_OPT_OBSERVE, m_observer_sequence_num++);
APP_ERROR_CHECK(err_code);
err_code = coap_message_opt_uint_add(p_response, COAP_OPT_MAX_AGE, p_resource->expire_time);
APP_ERROR_CHECK(err_code);
}
// If the registration of the observer could not be done, handle this as a normal message.
}
else
{
uint32_t handle;
err_code = coap_observe_server_search(&handle, &p_request->remote, p_resource);
if (err_code == NRF_SUCCESS)
{
err_code = coap_observe_server_unregister(handle);
APP_ERROR_CHECK(err_code);
}
}
}
// Set response payload to the actual LED state.
char * response_str;
led_value_get(ct_to_use, &response_str);
err_code = coap_message_payload_set(p_response, response_str, strlen(response_str));
APP_ERROR_CHECK(err_code);
}
break;
}
case COAP_CODE_PUT:
{
p_response->header.code = COAP_CODE_204_CHANGED;
// Change LED state according to request.
switch (p_request->p_payload[0])
{
case COMMAND_ON:
{
LEDS_ON(LED_THREE);
break;
}
case COMMAND_OFF:
{
LEDS_OFF(LED_THREE);
break;
}
case COMMAND_TOGGLE:
{
LEDS_INVERT(LED_THREE);
break;
}
default:
{
p_response->header.code = COAP_CODE_400_BAD_REQUEST;
break;
}
}
break;
}
default:
{
p_response->header.code = COAP_CODE_405_METHOD_NOT_ALLOWED;
break;
}
}
uint32_t msg_handle;
err_code = coap_message_send(&msg_handle, p_response);
APP_ERROR_CHECK(err_code);
err_code = coap_message_delete(p_response);
APP_ERROR_CHECK(err_code);
if (p_request->header.code == COAP_CODE_PUT)
{
notify_all_led3_subscribers(COAP_TYPE_NON);
}
}
/**@brief Function for handling button events.
*
* @param[in] pin_no The pin number of the button pressed.
* @param[in] button_action The action performed on button.
*/
static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
if(mp_interface == NULL)
{
return;
}
uint32_t err_code;
if (button_action == APP_BUTTON_PUSH)
{
coap_message_t * p_request = NULL;
switch (pin_no)
{
case BUTTON_ONE:
{
coap_message_conf_t message_conf;
coap_remote_t remote_device;
message_conf.type = COAP_MESSAGE_TYPE;
message_conf.code = COAP_CODE_GET;
message_conf.id = 0;
// Set token.
m_led3_observe_token = m_global_token_count;
(void)uint16_encode(HTONS(m_global_token_count), message_conf.token);
m_global_token_count++;
message_conf.token_len = 2;
message_conf.response_callback = coap_response_handler;
err_code = coap_message_new(&p_request, &message_conf);
APP_ERROR_CHECK(err_code);
memcpy(&remote_device.addr[0], (uint8_t []){SERVER_IPV6_ADDRESS}, IPV6_ADDR_SIZE);
remote_device.port_number = SERVER_PORT_NUM;
err_code = coap_message_remote_addr_set(p_request, &remote_device);
APP_ERROR_CHECK(err_code);
// Subscribe to the resource.
err_code = coap_message_opt_uint_add(p_request, COAP_OPT_OBSERVE, 0);
APP_ERROR_CHECK(err_code);
err_code = coap_message_opt_str_add(p_request, COAP_OPT_URI_PATH, (uint8_t *)m_uri_part_lights, strlen(m_uri_part_lights));
APP_ERROR_CHECK(err_code);
err_code = coap_message_opt_str_add(p_request, COAP_OPT_URI_PATH, (uint8_t *)m_uri_part_led3, strlen(m_uri_part_led3));
APP_ERROR_CHECK(err_code);
err_code = coap_message_opt_uint_add(p_request, COAP_OPT_ACCEPT, 0);
APP_ERROR_CHECK(err_code);
break;
}
case BUTTON_TWO:
{
coap_message_conf_t message_conf;
coap_remote_t remote_device;
message_conf.type = COAP_MESSAGE_TYPE;
message_conf.code = COAP_CODE_GET;
message_conf.id = 0;
// Re-use the original token for the observe.
(void)uint16_encode(HTONS(m_led3_observe_token), message_conf.token);
message_conf.token_len = 2;
message_conf.response_callback = coap_response_handler;
err_code = coap_message_new(&p_request, &message_conf);
APP_ERROR_CHECK(err_code);
memcpy(&remote_device.addr[0], (uint8_t []){SERVER_IPV6_ADDRESS}, IPV6_ADDR_SIZE);
remote_device.port_number = SERVER_PORT_NUM;
err_code = coap_message_remote_addr_set(p_request, &remote_device);
APP_ERROR_CHECK(err_code);
// Unsubscribe to the resource.
err_code = coap_message_opt_uint_add(p_request, COAP_OPT_OBSERVE, 1);
APP_ERROR_CHECK(err_code);
// Copy the original options (draft-ietf-core-observe 3.6).
err_code = coap_message_opt_str_add(p_request, COAP_OPT_URI_PATH, (uint8_t *)m_uri_part_lights, strlen(m_uri_part_lights));
APP_ERROR_CHECK(err_code);
err_code = coap_message_opt_str_add(p_request, COAP_OPT_URI_PATH, (uint8_t *)m_uri_part_led3, strlen(m_uri_part_led3));
APP_ERROR_CHECK(err_code);
err_code = coap_message_opt_uint_add(p_request, COAP_OPT_ACCEPT, 0);
APP_ERROR_CHECK(err_code);
break;
}
default:
break;
}
// TODO: If there is no more room for subscribing to observable resources, we should
// remove the observable option before sending the message.
if (p_request != NULL)
{
uint32_t msg_handle;
err_code = coap_message_send(&msg_handle, p_request);
if (err_code != NRF_SUCCESS)
{
APPL_LOG("[APPL]: CoAP Message skipped, error code = 0x%08lX.\r\n", err_code);
}
err_code = coap_message_delete(p_request);
APP_ERROR_CHECK(err_code);
}
}