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char databuff[19*EXAMPLE_DEFAULT_PKTSIZE];
...
//send data
void send_data(void *pvParameters)
{
    int len = 0;
    
    memset(databuff, EXAMPLE_PACK_BYTE_IS, EXAMPLE_DEFAULT_PKTSIZE);
    vTaskDelay(100/portTICK_RATE_MS);
    ESP_LOGI(TAG, "start sending...");
#if EXAMPLE_ESP_TCP_PERF_TX && EXAMPLE_ESP_TCP_DELAY_INFO
    //delaytime
    struct timeval tv_start;
    struct timeval tv_finish;
    unsigned long send_delay_ms;
#endif /*EXAMPLE_ESP_TCP_PERF_TX && EXAMPLE_ESP_TCP_DELAY_INFO*/
    while(1) {

#if EXAMPLE_ESP_TCP_PERF_TX && EXAMPLE_ESP_TCP_DELAY_INFO
    	total_pack++;
    	gettimeofday(&tv_start, NULL);
#endif /*EXAMPLE_ESP_TCP_PERF_TX && EXAMPLE_ESP_TCP_DELAY_INFO*/
    	
	//send function
    gpio_set_level(14, 0);
    len = send(connect_socket, databuff, sizeof(databuff), 0);
    gpio_set_level(14, 1);
    vTaskDelay(100/portTICK_RATE_MS);
#if EXAMPLE_ESP_TCP_PERF_TX && EXAMPLE_ESP_TCP_DELAY_INFO
    	gettimeofday(&tv_finish, NULL);
#endif /*EXAMPLE_ESP_TCP_PERF_TX && EXAMPLE_ESP_TCP_DELAY_INFO*/

Code: Select all

/* tcp_perf Example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <sys/time.h>

#define EXAMPLE_DEFAULT_SERVER_IP "52.53.111.152"
#define EXAMPLE_DEFAULT_PORT    (1985)
#define EXAMPLE_PACK_BYTE_IS 97 //'a'
#define EXAMPLE_DEFAULT_PKTSIZE (1460)

/*socket*/
static struct sockaddr_in server_addr;
static int connect_socket = 0;

int total_data = 0;



char databuff[19*EXAMPLE_DEFAULT_PKTSIZE];

struct timeval timeBefore, timeAfter;

//send data
void send_data(void *pvParameters)
{
    memset(databuff, EXAMPLE_PACK_BYTE_IS, EXAMPLE_DEFAULT_PKTSIZE);

    while(1) {
    
    (void)gettimeofday(&timeBefore, NULL);
	//send function
    (void)send(connect_socket, databuff, sizeof(databuff), 0);
    (void)gettimeofday(&timeAfter, NULL);
    long int elapsedTimeMs = (timeAfter.tv_sec * 1000000) + timeAfter.tv_usec - ((timeBefore.tv_sec * 1000000) + timeBefore.tv_usec);
    printf("-- Elapsed time: %ldms\n", elapsedTimeMs);
    usleep(100*1000);
    }
}


//use this esp32 as a tcp client. return ESP_OK:success ESP_FAIL:error
void create_tcp_client()
{
    
    connect_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (connect_socket < 0) {
    	printf("could not create client socket!\n");
	    return;
    }
    printf("socket = %d\n", connect_socket);
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(EXAMPLE_DEFAULT_PORT);
    server_addr.sin_addr.s_addr = inet_addr(EXAMPLE_DEFAULT_SERVER_IP);
    
    if (connect(connect_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
    	printf("could not connect to server socket!\n");
    }
}


//wifi_init_softap
int main(void)
{
    create_tcp_client();
    send_data(NULL);
    return 0;
}