Initial commit

component/common/example/nonblock_connect/example_nonblock_connect.c

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+#include "FreeRTOS.h"
+#include "task.h"
+#include <platform/platform_stdlib.h>
+#include <lwip/sockets.h>
+
+#define SERVER_IP              "192.168.13.1"
+#define SERVER_PORT            80
+
+// Need to define ERRNO in lwipopts.h
+int errno = 0;
+
+static void example_nonblock_connect_thread(void *param)
+{
+	int server_fd = -1;
+	struct sockaddr_in server_addr;
+
+	// Delay to wait for IP by DHCP
+	vTaskDelay(10000);
+	printf("\nExample: Non-blocking socket connect\n");
+
+	server_fd = socket(AF_INET, SOCK_STREAM, 0);
+	fcntl(server_fd, F_SETFL, fcntl(server_fd, F_GETFL, 0) | O_NONBLOCK);
+
+	server_addr.sin_family = AF_INET;
+	server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);
+	server_addr.sin_port = htons(SERVER_PORT);
+	connect(server_fd, (struct sockaddr *) &server_addr, sizeof(server_addr));
+
+	if(errno == EINPROGRESS) {
+		fd_set wfds;
+		struct timeval time_out;
+
+		time_out.tv_sec = 3;	// Set select timeout of 3 seconds
+		time_out.tv_usec = 0;
+		FD_ZERO(&wfds) ;
+		FD_SET(server_fd, &wfds);	// Only set server fd
+
+		// Use select to wait for non-blocking connect
+		if(select(server_fd + 1, NULL, &wfds, NULL, &time_out) == 1)
+			printf("Server connection successful\n");
+		else
+			printf("Server connection failed\n");
+	}
+	else {
+		printf("ERROR: connect\n");
+	}
+
+	close(server_fd);
+	vTaskDelete(NULL);
+}
+
+void example_nonblock_connect(void)
+{
+	if(xTaskCreate(example_nonblock_connect_thread, ((const char*)"example_nonblock_connect_thread"), 1024, NULL, tskIDLE_PRIORITY + 1, NULL) != pdPASS)
+		printf("\n\r%s xTaskCreate(init_thread) failed", __FUNCTION__);
+}

component/common/example/nonblock_connect/example_nonblock_connect.h

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+#ifndef EXAMPLE_NONBLOCK_CONNECT_H
+#define EXAMPLE_NONBLOCK_CONNECT_H
+
+void example_nonblock_connect(void);
+
+#endif /* EXAMPLE_NONBLOCK_CONNECT_H */

component/common/example/nonblock_connect/readme.txt

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+LWIP SOCKET NONBLOCKING CONNECT EXAMPLE
+
+Description:
+TCP nonblocking connect with use of select() for connection timeout handling.
+
+Configuration:
+Modify SERVER_IP and SERVER_PORT in example_nonblock_connect.c for server connection
+
+[platform_opts.h]
+	#define CONFIG_EXAMPLE_NONBLOCK_CONNECT    1
+[lwipopts.h]
+	#define ERRNO
+
+Execution:
+Can make automatical Wi-Fi connection when booting by using wlan fast connect example.
+A socket nonblocking connect example thread will be started automatically when booting.