这一部分比较简单，直接根据乐鑫提供的示例代码修改即可。
如果调试过程中出现问题的话，可以通过make menuconfig之后选择
Component config ->LWIP->Enable lwip Debug,打开api_lib.c和socket.c的调试信息，通过调试信息进行错误查找定位
void socketInit()
{
xTaskCreate(tcp_client_task, "tcp_client", 4096, NULL, 5, NULL);
xTaskCreate(tcp_server_task, "tcp_server", 4096, NULL, 5, NULL);
}
在APP_main()函数添加socketInit();
测试服务器不支持IPV6，故IPV6部分代码删除
tcp_client_task
static void tcp_client_task(void *pvParameters)
{
char rx_buffer[128];
char addr_str[128];
int addr_family;
int ip_protocol;
while (1) {
struct sockaddr_in destAddr;
destAddr.sin_addr.s_addr = inet_addr(HOST_IP_ADDR);
destAddr.sin_family = AF_INET;
destAddr.sin_port = htons(PORT);
addr_family = AF_INET;
ip_protocol = IPPROTO_IP;
inet_ntoa_r(destAddr.sin_addr, addr_str, sizeof(addr_str) - 1);
int sock = socket(addr_family, SOCK_STREAM, ip_protocol);
if (sock < 0) {
ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);
break;
}
ESP_LOGI(TAG, "Socket created");
int err = connect(sock, (struct sockaddr *)&destAddr, sizeof(destAddr));
if (err != 0) {
ESP_LOGE(TAG, "Socket unable to connect: errno %d", errno);
close(sock);
continue;
}
ESP_LOGI(TAG, "Successfully connected");
if (err==0){protocolSend(sock,NULL,0,0,0x02);}
//if (err==0){send(socket,hb,20,0);}
while (1) {
//int err = send(sock, payload, strlen(payload), 0);
//私有协议服务器，对传输的数据增加了一层封装
int err = protocolSend(sock,payload,strlen(payload),0,0x01);
if (err < 0) {
ESP_LOGE(TAG, "Error occured during sending: errno %d", errno);
break;
}
int len = recv(sock, rx_buffer, sizeof(rx_buffer) - 1, 0);
// Error occured during receiving
if (len < 0) {
ESP_LOGE(TAG, "recv failed: errno %d", errno);
break;
}
// Data received
else {
rx_buffer[len] = 0; // Null-terminate whatever we received and treat like a string
ESP_LOGI(TAG, "Received %d bytes from %s:", len, addr_str);
//此处增加代码对接收数据进行处理
ESP_LOGI(TAG, "%s", rx_buffer);
}
vTaskDelay(2000 / portTICK_PERIOD_MS);
}
if (sock != -1) {
ESP_LOGE(TAG, "Shutting down socket and restarting...");
shutdown(sock, 0);
close(sock);
}
}
vTaskDelete(NULL);
}
tcp_server_task
使用乐鑫提供的示例echo代码，仅注释IPV6相关代码并修改本机监听端口为SPORT
static void tcp_server_task(void *pvParameters)
{
char rx_buffer[128];
char addr_str[128];
int addr_family;
int ip_protocol;
while (1) {
//#ifdef CONFIG_EXAMPLE_IPV4
struct sockaddr_in destAddr;
destAddr.sin_addr.s_addr = htonl(INADDR_ANY);
destAddr.sin_family = AF_INET;
destAddr.sin_port = htons(SPORT);
addr_family = AF_INET;
ip_protocol = IPPROTO_IP;
inet_ntoa_r(destAddr.sin_addr, addr_str, sizeof(addr_str) - 1);
/*#else // IPV6
struct sockaddr_in6 destAddr;
bzero(&destAddr.sin6_addr.un, sizeof(destAddr.sin6_addr.un));
destAddr.sin6_family = AF_INET6;
destAddr.sin6_port = htons(PORT);
addr_family = AF_INET6;
ip_protocol = IPPROTO_IPV6;
inet6_ntoa_r(destAddr.sin6_addr, addr_str, sizeof(addr_str) - 1);
#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);
break;
}
ESP_LOGI(TAG, "Socket created");
int err = bind(listen_sock, (struct sockaddr *)&destAddr, sizeof(destAddr));
if (err != 0) {
ESP_LOGE(TAG, "Socket unable to bind: errno %d", errno);
break;
}
ESP_LOGI(TAG, "Socket binded");
err = listen(listen_sock, 1);
if (err != 0) {
ESP_LOGE(TAG, "Error occured during listen: errno %d", errno);
break;
}
ESP_LOGI(TAG, "Socket listening");
#ifdef CONFIG_EXAMPLE_IPV6
struct sockaddr_in6 sourceAddr; // Large enough for both IPv4 or IPv6
#else
struct sockaddr_in sourceAddr;
#endif
uint addrLen = sizeof(sourceAddr);
int sock = accept(listen_sock, (struct sockaddr *)&sourceAddr, &addrLen);
if (sock < 0) {
ESP_LOGE(TAG, "Unable to accept connection: errno %d", errno);
break;
}
ESP_LOGI(TAG, "Socket accepted");
while (1) {
int len = recv(sock, rx_buffer, sizeof(rx_buffer) - 1, 0);
// Error occured during receiving
if (len < 0) {
ESP_LOGE(TAG, "recv failed: errno %d", errno);
break;
}
// Connection closed
else if (len == 0) {
ESP_LOGI(TAG, "Connection closed");
break;
}
// Data received
else {
/*#ifdef CONFIG_EXAMPLE_IPV6
// Get the sender's ip address as string
if (sourceAddr.sin6_family == PF_INET) {
inet_ntoa_r(((struct sockaddr_in *)&sourceAddr)->sin_addr.s_addr, addr_str, sizeof(addr_str) - 1);
} else if (sourceAddr.sin6_family == PF_INET6) {
inet6_ntoa_r(sourceAddr.sin6_addr, addr_str, sizeof(addr_str) - 1);
}
#else*/
inet_ntoa_r(((struct sockaddr_in *)&sourceAddr)->sin_addr.s_addr, addr_str, sizeof(addr_str) - 1);
//#endif
rx_buffer[len] = 0; // Null-terminate whatever we received and treat like a string
ESP_LOGI(TAG, "Received %d bytes from %s:", len, addr_str);
ESP_LOGI(TAG, "%s", rx_buffer);
int err = send(sock, rx_buffer, len, 0);
if (err < 0) {
ESP_LOGE(TAG, "Error occured during sending: errno %d", errno);
break;
}
}
}
if (sock != -1) {
ESP_LOGE(TAG, "Shutting down socket and restarting...");
shutdown(sock, 0);
close(sock);
//这里处理有问题
}
}
vTaskDelete(NULL);
}
经测试发现TCP Server的示例程序有问题，断开后无法重连，报错：Socket unable to bind: errno 112
论坛查找后简单修改即可：
if (sock != -1) {
ESP_LOGE(TAG, "Shutting down socket and restarting...");
shutdown(sock, 0);
close(sock);
//这里处理有问题,增加三行代码
shutdown(listen_sock,0);
close(listen_sock);
vTaskDelay(5);
}