void
http_get_task(void *pvParameters)
{
coap_packet_t request[1]; /* This way the packet can be treated as pointer as usual. */
int failures = 0;
// create network socket
struct addrinfo hints;
struct addrinfo *res;
// Use an UDP socket
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_DGRAM;
// Get host/port from request URL
// should call free(uri) somewhere
coap_uri_t *uri = coap_new_uri((unsigned char*)URI, strlen(URI));
if (uri == NULL) {
COAP_PRINTF("coap_new_uri(): URI failed\n");
vTaskDelete(NULL);
}
// DNS lookup
int err;
char port[6];
char host[32];
char path[64];
sprintf(port, "%d", uri->port);
sprintf(path, "%s", uri->path.s);
memcpy(host, uri->host.s, uri->host.length);
host[uri->host.length] = '\0';
COAP_PRINTF("URI Path: %s\n", path);
COAP_PRINTF("URI Host: %s\n", host);
COAP_PRINTF("URI Port: %s\n", port);
printf("Running DNS lookup for %s...\r\n", host);
while (1) {
err = getaddrinfo(host, port, &hints, &res);
if (err == 0)
break;
freeaddrinfo(res);
printf("DNS lookup failed err=%d res=%p\r\n", err, res);
vTaskDelay(3000 / portTICK_RATE_MS);
}
/* Note: inet_ntoa is non-reentrant, look at ipaddr_ntoa_r for "real" code */
struct in_addr *addr = &((struct sockaddr_in *)res->ai_addr)->sin_addr;
char *ip = inet_ntoa(*addr);
printf("DNS lookup succeeded. HOST=%s, IP=%s\r\n", host, ip);
// init a HTTP POST message and set message header
coap_init_message(request, COAP_TYPE_CON, COAP_POST, 0);
coap_set_header_uri_path(request, path);
coap_set_header_uri_host(request, host);
// Create a local socket
int s = socket(res->ai_family, res->ai_socktype, 0);
if(s < 0) {
printf("... Failed to allocate socket.\r\n");
freeaddrinfo(res);
vTaskDelete(NULL);
}
printf("... allocated socket\r\n");
int a;
int ret;
char payload[128];
struct request_state_t state[1];
ip_addr_t ipaddr;
ipaddr.addr = ipaddr_addr(ip);
while(1) {
if(connect(s, res->ai_addr, res->ai_addrlen) != 0) {
close(s);
freeaddrinfo(res);
printf("... socket connect failed.\r\n");
vTaskDelay(3000 / portTICK_RATE_MS);
failures++;
continue;
}
printf("... connected\r\n");
freeaddrinfo(res);
repeat:
vTaskDelay(5000 / portTICK_RATE_MS);
// read sensor data from ESP8266 A0
a = sdk_system_adc_read();
sprintf(payload, "{ \"quality\": %d }\n", a);
COAP_PRINTF("Payload: %s\n", payload);
// CoAP payload
coap_set_payload(request, payload, strlen(payload));
// Make CoAP transaction
request->mid = coap_get_mid();
if ((state->transaction = coap_new_transaction(request->mid, &ipaddr, uri->port)))
{
state->transaction->callback = coap_blocking_request_callback;
state->transaction->callback_data = state;
if (state->block_num > 0)
{
coap_set_header_block2(request, state->block_num, 0, REST_MAX_CHUNK_SIZE);
}
// Build CoAP header and Options
state->transaction->packet_len = coap_serialize_message(request, state->transaction->packet);
COAP_PRINTF("Header dump: [0x%02X %02X %02X %02X]. Size: %d\n",
request->buffer[0],
request->buffer[1],
request->buffer[2],
request->buffer[3],
state->transaction->packet_len
);
COAP_PRINTF("Requested #%u (MID %u)\n", state->block_num, request->mid);
// Transmit
ret = write(s, state->transaction->packet, state->transaction->packet_len);
//ret = sendto(s, state->transaction->packet, state->transaction->packet_len);
if (ret < 0) {
printf("[RET: %d] CoAP packet send failed.\n", ret);
continue;
}
}
else
{
COAP_PRINTF("Could not allocate transaction buffer");
}
goto repeat;
}
}
void
transmitTask(void *pvParameters)
{
struct userdata *user = (struct userdata *)pvParameters;
coap_packet_t request[1]; /* This way the packet can be treated as pointer as usual. */
int a;
char payload[128];
int failures = 0;
// Get host/port from request URL
// should call free(uri) somewhere
coap_uri_t *uri = coap_new_uri(SERVER_URI, strlen(SERVER_URI));
if (uri == NULL) {
COAP_PRINTF("coap_new_uri(): URI failed\n");
vTaskDelete(NULL);
}
COAP_PRINTF("URI Path: %s\n", uri->path.s);
COAP_PRINTF("URI Host: %s\n", uri->host.s);
// init a HTTP POST message and set message header
coap_init_message(request, COAP_TYPE_CON, COAP_POST, 0);
coap_set_header_uri_path(request, (char *)uri->path.s);
coap_set_header_uri_host(request, (char *)uri->host.s);
// create network socket
struct addrinfo hints;
struct addrinfo *res;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
// 2. DNS lookup
int err;
char port[6];
sprintf(port, "%d", uri->port);
printf("Running DNS lookup for %s...\r\n", uri->host.s);
while (1) {
err = getaddrinfo((char*)uri->host.s, (char*)port, &hints, &res);
if (err == 0)
break;
freeaddrinfo(res);
printf("DNS lookup failed err=%d res=%p\r\n", err, res);
vTaskDelay(3000 / portTICK_RATE_MS);
}
/* Note: inet_ntoa is non-reentrant, look at ipaddr_ntoa_r for "real" code */
struct in_addr *addr = &((struct sockaddr_in *)res->ai_addr)->sin_addr;
printf("DNS lookup succeeded. IP=%s\r\n", inet_ntoa(*addr));
// 3. Create a local socket
int s = socket(res->ai_family, res->ai_socktype, 0);
if(s < 0) {
printf("... Failed to allocate socket.\r\n");
freeaddrinfo(res);
vTaskDelete(NULL);
}
printf("... allocated socket\r\n");
int ret;
while(1) {
// connect to server
if (connect(s, res->ai_addr, res->ai_addrlen) != 0) {
close(s);
freeaddrinfo(res);
failures++;
printf("... socket connect failed. tries = %d.\r\n", failures);
vTaskDelay(4000 / portTICK_RATE_MS);
continue;
}
printf("... connected\r\n");
freeaddrinfo(res);
repeat:
xQueueReceive(user->xQueue, &a, portMAX_DELAY);
sprintf(payload, "{ \"quality\": %d }\n", a);
COAP_PRINTF("Payload: %s\n", payload);
// CoAP payload
coap_set_payload(request, payload, strlen(payload));
ret = write(s, payload, strlen(payload));
if (ret >= 0) goto repeat;
}
}
