always return -1 when invoke function: connect about esp8266_rtos_sdk

[Eszartek]

Here is a complete working example based on your code. I set it to connect to a public ftp server for demo purposes. Note that I changed the location of your zalloc since I was getting an exception using your placement (probably due to proximity of the network i/o code). I threw in a few delays here & there so it won't pound the server to hard.

#include <esp_common.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include <uart.h>
#include "lwip/sockets.h"

#define SERVER_IP       "90.130.70.73"
#define SERVER_PORT     21
#define TCP_DATA_LEN    256

static int32 sock_fd;
void tcpc_task() {
    int32 ret = 0;
    int32 recbytes;
    char *recv_buf = (char *)malloc(TCP_DATA_LEN);
    struct sockaddr_in tcpServerAddr;

    memset(&tcpServerAddr, 0, sizeof(tcpServerAddr));
    tcpServerAddr.sin_family = AF_INET;
    tcpServerAddr.sin_addr.s_addr = inet_addr(SERVER_IP);
    tcpServerAddr.sin_len = sizeof(tcpServerAddr);
    tcpServerAddr.sin_port = htons(SERVER_PORT);
    while (1) {
        sock_fd = socket(AF_INET, SOCK_STREAM, 0);
        if (sock_fd == -1) {
            printf("ESP8266 TCP client task > socket error\r\n");
            close(sock_fd);
            vTaskDelay(1000 / portTICK_RATE_MS);
            continue;
        }
        printf("ESP8266 TCP client task > create socket: %d\r\n", sock_fd);

        ret = connect(sock_fd, (struct sockaddr* )&tcpServerAddr,
        sizeof(struct sockaddr));
        if (ret != 0) {
            printf("ESP8266 TCP client task > connect fail!\r\n");
            close(sock_fd);
            vTaskDelay(1000 / portTICK_RATE_MS);
            continue;
        }
        printf("ESP8266 TCP client task > connect ok!\r\n");

        while ((recbytes = read(sock_fd, recv_buf, TCP_DATA_LEN)) > 0) {
            recv_buf[recbytes] = 0;
            printf("ESP8266 TCP client task > recv data %d bytes!\r\n%s\r\n",
            recbytes,recv_buf);
            write(sock_fd, recv_buf, strlen(recv_buf) + 1);
            vTaskDelay(1000 / portTICK_RATE_MS);
        }
        vTaskDelay(1000 / portTICK_RATE_MS);
        recv_buf[0] = 0;
        if (recbytes <= 0) {
            printf("ESP8266 TCP client task > read data fail!\n");
            close(sock_fd);
        }
        vTaskDelay(10000 / portTICK_RATE_MS);
    }
}

void user_init(void) {
    //setup a sane baudrate
    UART_ConfigTypeDef uart_config;
    uart_config.baud_rate         = BIT_RATE_115200;
    uart_config.data_bits         = UART_WordLength_8b;
    uart_config.parity            = USART_Parity_None;
    uart_config.stop_bits         = USART_StopBits_1;
    uart_config.flow_ctrl         = USART_HardwareFlowControl_None;
    uart_config.UART_RxFlowThresh = 120;
    uart_config.UART_InverseMask  = UART_None_Inverse;
    UART_ParamConfig(UART0, &uart_config);

    struct station_config cfg;
    strcpy((char *)cfg.ssid, "your-wifi-ssid");
    strcpy((char *)cfg.password, "your-wifi-key");

    wifi_set_opmode(STATION_MODE);
    wifi_station_set_config(&cfg);
    wifi_station_set_auto_connect(1);

    vTaskDelay(3000 / portTICK_RATE_MS); //give wifi chance to connect

    xTaskCreate(tcpc_task, (signed char *)"tcpc_task", 512, NULL, 1, NULL);
}

[suda-morris]

Thanks a lot. I have solved the problem. Because of the firewall of Win7, the TCP Server program can't get any connection from outside. When I trust it, the it works well. Thanks you very much.

[Eszartek]

Super! I'm glad to hear you solved the issue and shared the solution. I too tend to get hung up (sometimes for days) on simple issues. I find having a fully working example speeds up the troubleshooting.