以下是代码,工程由v5.1创建
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/* BSD Socket API 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 <string.h>
#include <sys/param.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "esp_netif.h"
#include "protocol_examples_common.h"
#include "lwip/err.h"
#include "lwip/sockets.h"
#include "lwip/sys.h"
#include <lwip/netdb.h>
#include "driver/uart.h"
#include "driver/gpio.h"
#define PORT CONFIG_EXAMPLE_PORT
#define KEEPALIVE_IDLE CONFIG_EXAMPLE_KEEPALIVE_IDLE
#define KEEPALIVE_INTERVAL CONFIG_EXAMPLE_KEEPALIVE_INTERVAL
#define KEEPALIVE_COUNT CONFIG_EXAMPLE_KEEPALIVE_COUNT
static const char *TAG = "example";
int tcp_sock = 0;
QueueHandle_t uart_queue = NULL;
static void do_retransmit(const int sock)
{
int len;
char rx_buffer[128];
do {
len = recv(sock, rx_buffer, sizeof(rx_buffer) - 1, 0);
if (len < 0)
{
ESP_LOGE(TAG, "Error occurred during receiving: errno %d", errno);
}
else if (len == 0)
{
ESP_LOGW(TAG, "Connection closed");
}
else
{
uart_write_bytes(UART_NUM_1, rx_buffer, len);
rx_buffer[len] = 0; // Null-terminate whatever is received and treat it like a string
ESP_LOGI(TAG, "Received %d bytes: %s", len, rx_buffer);
int to_write = len;
while (to_write > 0) {
int written = send(sock, rx_buffer + (len - to_write), to_write, 0);
if (written < 0) {
ESP_LOGE(TAG, "Error occurred during sending: errno %d", errno);
// Failed to retransmit, giving up
return;
}
to_write -= written;
}
}
} while (len > 0);
}
static void tcp_server_task(void *pvParameters)
{
char addr_str[128];
int addr_family = (int)pvParameters;
int ip_protocol = 0;
int keepAlive = 1;
int keepIdle = KEEPALIVE_IDLE;
int keepInterval = KEEPALIVE_INTERVAL;
int keepCount = KEEPALIVE_COUNT;
struct sockaddr_storage dest_addr;
#ifdef CONFIG_EXAMPLE_IPV4
if (addr_family == AF_INET) {
struct sockaddr_in *dest_addr_ip4 = (struct sockaddr_in *)&dest_addr;
dest_addr_ip4->sin_addr.s_addr = htonl(INADDR_ANY);
dest_addr_ip4->sin_family = AF_INET;
dest_addr_ip4->sin_port = htons(PORT);
ip_protocol = IPPROTO_IP;
}
#endif
#ifdef CONFIG_EXAMPLE_IPV6
if (addr_family == AF_INET6) {
struct sockaddr_in6 *dest_addr_ip6 = (struct sockaddr_in6 *)&dest_addr;
bzero(&dest_addr_ip6->sin6_addr.un, sizeof(dest_addr_ip6->sin6_addr.un));
dest_addr_ip6->sin6_family = AF_INET6;
dest_addr_ip6->sin6_port = htons(PORT);
ip_protocol = IPPROTO_IPV6;
}
#endif
int listen_sock = socket(addr_family, SOCK_STREAM, ip_protocol);
if (listen_sock < 0) {
ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);
vTaskDelete(NULL);
return;
}
int opt = 1;
setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
#if defined(CONFIG_EXAMPLE_IPV4) && defined(CONFIG_EXAMPLE_IPV6)
// Note that by default IPV6 binds to both protocols, it is must be disabled
// if both protocols used at the same time (used in CI)
setsockopt(listen_sock, IPPROTO_IPV6, IPV6_V6ONLY, &opt, sizeof(opt));
#endif
ESP_LOGI(TAG, "Socket created");
int err = bind(listen_sock, (struct sockaddr *)&dest_addr, sizeof(dest_addr));
if (err != 0) {
ESP_LOGE(TAG, "Socket unable to bind: errno %d", errno);
ESP_LOGE(TAG, "IPPROTO: %d", addr_family);
goto CLEAN_UP;
}
ESP_LOGI(TAG, "Socket bound, port %d", PORT);
err = listen(listen_sock, 1);
if (err != 0) {
ESP_LOGE(TAG, "Error occurred during listen: errno %d", errno);
goto CLEAN_UP;
}
while (1) {
ESP_LOGI(TAG, "Socket listening");
struct sockaddr_storage source_addr; // Large enough for both IPv4 or IPv6
socklen_t addr_len = sizeof(source_addr);
int sock = accept(listen_sock, (struct sockaddr *)&source_addr, &addr_len);
if (sock < 0) {
ESP_LOGE(TAG, "Unable to accept connection: errno %d", errno);
break;
}
tcp_sock = sock;
// Set tcp keepalive option
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &keepAlive, sizeof(int));
setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, &keepIdle, sizeof(int));
setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL, &keepInterval, sizeof(int));
setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT, &keepCount, sizeof(int));
// Convert ip address to string
#ifdef CONFIG_EXAMPLE_IPV4
if (source_addr.ss_family == PF_INET) {
inet_ntoa_r(((struct sockaddr_in *)&source_addr)->sin_addr, addr_str, sizeof(addr_str) - 1);
}
#endif
#ifdef CONFIG_EXAMPLE_IPV6
if (source_addr.ss_family == PF_INET6) {
inet6_ntoa_r(((struct sockaddr_in6 *)&source_addr)->sin6_addr, addr_str, sizeof(addr_str) - 1);
}
#endif
ESP_LOGI(TAG, "Socket accepted ip address: %s", addr_str);
do_retransmit(sock);
shutdown(sock, 0);
close(sock);
}
CLEAN_UP:
close(listen_sock);
vTaskDelete(NULL);
}
void diaodian()
{
}
void uart_read_task(void *arg)
{
uart_event_t event;
uint8_t uart_data[1024] = {0};
while (1)
{
if(xQueueReceive(uart_queue, (void*)&event, portMAX_DELAY))
{
//接收到串口数据
memset(uart_data, 0, sizeof(uart_data));
switch (event.type)
{
case UART_DATA:
ESP_LOGI(TAG, "串口数据事件");
uart_read_bytes(UART_NUM_1, uart_data, event.size, portMAX_DELAY); //接收串口数据
send(tcp_sock, uart_data, event.size, 0); //发送数据到网口
break;
default:
ESP_LOGI(TAG, "其他串口事件,事件类型:%d", event.type);
break;
}
}
}
vTaskDelete(NULL);
}
void app_main(void)
{
uart_config_t uart_cfg = {
.baud_rate = 115200,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
.source_clk = UART_SCLK_DEFAULT,
};
uart_driver_install(UART_NUM_1, 2 * 1024, 2 * 1024, 10, &uart_queue, 0);
uart_param_config(UART_NUM_1, &uart_cfg);
uart_set_pin(UART_NUM_1, GPIO_NUM_4, GPIO_NUM_5, -1, -1);
xTaskCreate(uart_read_task, "read_task", 5 * 1024, NULL, 3, NULL);
ESP_ERROR_CHECK(nvs_flash_init());
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
* Read "Establishing Wi-Fi or Ethernet Connection" section in
* examples/protocols/README.md for more information about this function.
*/
ESP_ERROR_CHECK(example_connect());
#ifdef CONFIG_EXAMPLE_IPV4
xTaskCreate(tcp_server_task, "tcp_server", 4096, (void*)AF_INET, 5, NULL);
#endif
#ifdef CONFIG_EXAMPLE_IPV6
xTaskCreate(tcp_server_task, "tcp_server", 4096, (void*)AF_INET6, 5, NULL);
#endif
}
![Image](https://z1.ax1x.com/2023/11/21/piauW1x.png)
以下是使用modbus TCP例程的延迟时间
![Image](https://z1.ax1x.com/2023/11/21/piauR91.png)