esp-open-rtos/examples/http_get/main.c

#include "espressif/esp_common.h"

#include "FreeRTOS.h"
#include "task.h"

#include "lwip/err.h"
#include "lwip/sockets.h"
#include "lwip/sys.h"
#include "lwip/netdb.h"
#include "lwip/dns.h"

#include "espressif/blob_prototypes.h"

#define WEB_SERVER "chainxor.org"
#define WEB_PORT 80
#define WEB_URL "http://chainxor.org/"

/* FILL THESE IN!!!!!!!!!! */
#define WIFI_SSID "SSID Name Here"
#define WIFI_PASS "Wifi Password Here"

void http_get_task(void *pvParameters)
{
    int successes = 0, failures = 0;
    printf("HTTP get task starting...\r\n");

    while(1) {
	const struct addrinfo hints = {
	    .ai_family = AF_INET,
	    .ai_socktype = SOCK_STREAM,
	};
	struct addrinfo *res;

	printf("Running DNS lookup for %s...\r\n", WEB_SERVER);
	int err = getaddrinfo(WEB_SERVER, "80", &hints, &res);

	if(err != 0 || res == NULL) {
	    printf("DNS lookup failed err=%d res=%p\r\n", err, res);
	    if(res)
		freeaddrinfo(res);
	    vTaskDelay(1000 / portTICK_RATE_MS);
	    failures++;
	    continue;
	}
	printf("DNS lookup succeeded. IP=%s\r\n", inet_ntoa(res->ai_addr));

	int s = socket(res->ai_family, res->ai_socktype, 0);
	if(s < 0) {
	    printf("... Failed to allocate socket.\r\n");
	    freeaddrinfo(res);
	    vTaskDelay(1000 / portTICK_RATE_MS);
	    failures++;
	    continue;
	}

        printf("... allocated socket\r\n");

        if(connect(s, res->ai_addr, res->ai_addrlen) != 0) {
            close(s);
	    freeaddrinfo(res);
            printf("... socket connect failed.\r\n");
            vTaskDelay(4000 / portTICK_RATE_MS);
	    failures++;
            continue;
        }

        printf("... connected\r\n");
	freeaddrinfo(res);

	const char *req =
	    "GET "WEB_URL"\r\n"
	    "User-Agent: esp-open-rtos/0.1 esp8266\r\n"
	    "\r\n";
        if (write(s, req, strlen(req) + 1) < 0) {
            printf("... socket send failed\r\n");
	    close(s);
	    vTaskDelay(4000 / portTICK_RATE_MS);
	    failures++;
	    continue;
        }
        printf("... socket send success\r\n");

	static char recv_buf[128];
	int r;
	do {
	    bzero(recv_buf, 128);
	    r = read(s, recv_buf, 127);
	    if(r > 0) {
		printf("%s", recv_buf);
	    }
	} while(r > 0);

	printf("... done reading from socket. Last read return=%d errno=%d\r\n", r, errno);
	if(r != 0)
	    failures++;
	else
	    successes++;
	close(s);
	printf("successes = %d failures = %d\r\n", successes, failures);
	for(int countdown = 10; countdown >= 0; countdown--) {
	    printf("%d... ", countdown);
	    vTaskDelay(1000 / portTICK_RATE_MS);
	}
	printf("\r\nStarting again!\r\n");
    }
}

void user_init(void)
{
    uart_div_modify(0, UART_CLK_FREQ / 115200);
    printf("SDK version:%s\n", system_get_sdk_version());

    struct station_config config = {
	.ssid = WIFI_SSID,
	.password = WIFI_PASS,
    };

    /* required to call wifi_set_opmode before station_set_config */
    wifi_set_opmode(STATION_MODE);
    wifi_station_set_config(&config);

    xTaskCreate(&http_get_task, (signed char *)"get_task", 256, NULL, 2, NULL);
}