我想在ESP32上的Windows和TCP客户端上设置TCP服务器。主要的想法是发送字符串到ESP32更改它并将其发送回服务器,但我真的是新的所有这些东西,并坚持在ESP32上设置TCP客户端。示例或参考将非常有用。
你如何与ESP沟通?如果你通过UART进行通信,只需通过写UART端口发送他需要的AT命令:
“AT + CIPSTATUS \ r \ n”然后等待他的回复。
如果您直接使用计算机连接到ESP32,只需使用putty并直接向其发送AT命令即可。
可以在此处找到AT命令的非详尽列表:https://www.espressif.com/sites/default/files/documentation/esp32_at_instruction_set_and_examples_en.pdf
int create_ipv4_socket()
{
struct addrinfo hints;
struct addrinfo *res;
struct in_addr *addr;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
int err = getaddrinfo(UDP_IPV4_ADDR, TCP_PORT, &hints, &res);
if(err != 0 || res == NULL) {
printf("DNS lookup failed err=%d res=%p\n", err, res);
return -1;
}
/* Code to print the resolved IP.
Note: inet_ntoa is non-reentrant, look at ipaddr_ntoa_r for "real" code */
addr = &((struct sockaddr_in *)res->ai_addr)->sin_addr;
printf("DNS lookup succeeded. IP=%s\n", inet_ntoa(*addr));
l_sock = socket(res->ai_family, res->ai_socktype, 0);
if(l_sock < 0) {
printf("... Failed to allocate socket.\n");
freeaddrinfo(res);
return -1;
}
struct timeval to;
to.tv_sec = 2;
to.tv_usec = 0;
setsockopt(l_sock,SOL_SOCKET,SO_SNDTIMEO,&to,sizeof(to));
if(connect(l_sock, res->ai_addr, res->ai_addrlen) != 0) {
printf("... socket connect failed errno=%d\n", errno);
close(l_sock);
freeaddrinfo(res);
return -1;
}
printf("... connected\n");
freeaddrinfo(res);
// All set, socket is configured for sending and receiving
return l_sock;
}