WiFi ssid 和密码设置
修改文件 device/soc/rockchip/rk2206/sdk_liteos/platform/network/config_network.c 中的SSID WiFi名称，PASSWORD WiFi密码 连接到与pc同一网络
#define SSID "凌智电子"
#define PASSWORD "88888888"
确认main文件 device/soc/rockchip/rk2206/sdk_liteos/platform/main/main.c wifi功能已开启
ExternalTaskConfigNetwork();
查看小凌派获取到的IP地址和网关
确认pc与小凌派在同一局域网，查看PC的IP地址和网关
网关都是 192.168.2.1表示在同一局域网
修改wifi_tcp例程中 服务地址及端口号后重新编译烧录程序
#define OC_SERVER_IP "192.168.2.49"
#define SERVER_PORT 6666
pc上打开两个网络调试工具一个客户端一个服务端，并设置IP地址和端口号
查看log 等待小凌派的tcp客户端和服务端任务启动
当小凌派tcp客户端和服务端启动后， 再用网络调试助手点击启动客户端和服务端
然后就可以通过网络工具与小凌派通信了
程序设计
API分析
头文件
#include "lz_hardware.h"
#include "config_network.h"
#include "lwip/tcp.h"
#include "lwip/ip_addr.h"
#include "lwip/priv/tcp_priv.h"
#include "lwip/stats.h"
#include "lwip/inet_chksum.h"
socket()
int socket(int domain, int type, int protocol)；
描述：
创建套接字 参数：
返回值：
返回大于0为成功，反之为失败
bind()
int bind(int sockfd, struct sockaddr *my_addr, int addrlen)；
描述：
绑定地址端口号
参数：
返回值：
返回大于0为成功，反之为失败
connect()
int connect(int sockfd, struct sockaddr *serv_addr, int addrlen)；
描述：
连接。
参数：
返回值：
返回大于0为成功，反之为失败
listen()
int listen(int sockfd, int backlog)；
描述：
监听
参数：
返回值：
返回等于0为成功，反之为失败
accept()
int accept(int sockfd, void *addr, int addrlen);
描述：
接受的一个连接
参数：
返回值：
如果没有错误产生，则accept()返回一个描述所接受包的SOCKET类型的值
send()
int send(int sockfd, const void *msg, int len, int flags);
描述：
发送消息
参数：
返回值：
发送成功返回发送字节数，失败返回值小于0
recv()
int recv(int sockfd, void *buf, int len, unsigned int flags)；
描述：
接收消息
参数：
返回值：
接收成功返回大于0，失败返回值小于0
lwip_close()
int lwip_close(int sockfd)；
描述：
关闭套接字
参数：
返回值：
发送成功返回发送字节数，失败返回值小于0
主要代码分析
创建客户端任务 socket-->connect-->send-->recv-->lwip_close
int wifi_client(void* arg)
{
int client_fd, ret;
struct sockaddr_in serv_addr;
while(1)
{
client_fd = socket(AF_INET, SOCK_STREAM, 0);//AF_INET:IPV4;SOCK_STREAM:TCP
if (client_fd < 0)
{
printf("create socket fail!\n");
return -1;
}
/*设置调用close(socket)后,仍可继续重用该socket。调用close(socket)一般不会立即关闭socket，而经历TIME_WAIT的过程。*/
int flag = 1;
ret = setsockopt(client_fd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(int));
if (ret != 0) {
printf("[CommInitTcpServer]setsockopt fail, ret[%d]!\n", ret);
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr(OC_SERVER_IP);
serv_addr.sin_port = htons(SERVER_PORT);
printf("[tcp client] connect:%d<%s:%d>\n",client_fd, inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port));
tcp_client_msg_handle(client_fd, (struct sockaddr*)&serv_addr);
LOS_Msleep(1000);
}
}
连接服务端，并发送消息和接收消息
void tcp_client_msg_handle(int fd, struct sockaddr* dst)
{
int cnt = 0, count = 0;
while (connect(fd, dst, len) < 0)
{
printf("connect server failed...%d\n", ++count);
lwip_close(fd);
LOS_Msleep(5000);
fd = socket(AF_INET, SOCK_STREAM, 0); //AF_INET:IPV4;SOCK_STREAM:TCP
}
while (1)
{
char buf[BUFF_LEN];
sprintf(buf, "TCP TEST cilent send:%d", ++cnt);
count = send(fd, buf, strlen(buf), 0); //发送数据给server
// count = lwip_write(fd, buf, strlen(buf)); //发送数据给server
printf("------------------------------------------------------------\n");
printf("[tcp client] send:%s\n", buf);
printf("[tcp client] client sendto msg to server %d,waitting server respond msg!!!\n", count);
memset(buf, 0, BUFF_LEN);
count = recv(fd, buf, BUFF_LEN, 0); //接收来自server的信息
// count = lwip_read(fd, buf, BUFF_LEN); //接收来自server的信息
if(count == -1)
{
printf("[tcp client] recieve data fail!\n");
LOS_Msleep(3000);
break;
}
printf("[tcp client] rev:%s\n", buf);
}
lwip_close(fd);
}
创建服务端任务 socket-->bind-->listen-->accept-->recv-->send-->close
int wifi_server(void* arg)
{
int server_fd, ret;
while(1)
{
server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd < 0)
{
printf("create socket fail!\n");
return -1;
}
int flag = 1;
ret = setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(int));
if (ret != 0) {
printf("[CommInitTcpServer]setsockopt fail, ret[%d]!\n", ret);
}
struct sockaddr_in serv_addr = {0};
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(SERVER_PORT);
ret = bind(server_fd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
if (ret < 0)
{
printf("socket bind fail!\n");
lwip_close(server_fd);
return -1;
}
ret = listen(server_fd, 64);
if(ret != 0)
{
printf("socket listen fail!\n");
lwip_close(server_fd);
return -1;
}
printf("[tcp server] listen:%d<%s:%d>\n",server_fd, inet_ntoa(serv_addr.sin_addr), ntohs(serv_addr.sin_port));
tcp_server_msg_handle(server_fd);
LOS_Msleep(1000);
}
}
连接客户端，并发送消息和接收消息
void tcp_server_msg_handle(int fd)
{
char buf[BUFF_LEN]; //接收缓冲区
socklen_t client_addr_len;
int cnt = 0, count;
int client_fd;
struct sockaddr_in client_addr = {0};
printf("waitting for client connect...\n");
/* 监听socket 此处会阻塞 */
client_fd = accept(fd, (struct sockaddr*)&client_addr, &client_addr_len);
// client_fd = lwip_accept(fd, (struct sockaddr*)&client_addr, &client_addr_len);
printf("[tcp server] accept <%s:%d>\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
while (1)
{
memset(buf, 0, BUFF_LEN);
printf("-------------------------------------------------------\n");
printf("[tcp server] waitting client msg\n");
count = recv(client_fd, buf, BUFF_LEN, 0); //read是阻塞函数，没有数据就一直阻塞
// count = lwip_read(client_fd, buf, BUFF_LEN); //read是阻塞函数，没有数据就一直阻塞
if (count == -1)
{
printf("[tcp server] recieve data fail!\n");
LOS_Msleep(3000);
break;
}
printf("[tcp server] rev client msg:%s\n", buf);
memset(buf, 0, BUFF_LEN);
sprintf(buf, "I have recieved %d bytes data! recieved cnt:%d", count, ++cnt);
printf("[tcp server] send msg:%s\n", buf);
send(client_fd, buf, strlen(buf), 0); //发送信息给client
// lwip_write(client_fd, buf, strlen(buf)); //发送信息给client
}
lwip_close(client_fd);
lwip_close(fd);
}
编译调试
修改 BUILD.gn 文件
修改 vendor/lockzhiner/lingpi/sample 路径下 BUILD.gn 文件，指定 b7_wifi_tcp 参与编译。
"b7_wifi_tcp",
在主目录下输入编译命令。
hb build -f
运行结果
示例代码编译烧录代码后，按下开发板的RESET按键，通过串口助手查看日志，串口0显示如下：
[wifi_api:D]netif setup ...
[coonfig_network:D]rknetwork EnableWifi done
[coonfig_network:D]rknetwork SetWifiScan after g_wificonfig.bssid:
[wifi_api_internal:D]Connect to (SSID=凌智电子)
[wifi_api_internal:D]derive psk ...
[wifi_api_internal:D]derive psk done
[wifi_api_internal:D]recovery process ...
[wifi_api_internal:D]AP BSSID (30:5f:77:80:80:b0)
[coonfig_network:I]ConnectTo (凌智电子) done
[coonfig_network:D]rknetwork IP (192.168.2.50)
[coonfig_network:D]network GW (192.168.2.1)
[coonfig_network:D]network NETMASK (255.255.255.0)
[WIFI_DEVICE:E]l o num:0 127.0.0.1
[WIFI_DEVICE:E]w l num:1 192.168.2.50
[coonfig_network:D]set network GW
[coonfig_network:D]network GW (192.168.2.1)
[coonfig_network:D]network NETMASK (255.255.255.0)
[tcp:D]rknetwork IP (192.168.2.50)
[tcp:D]network GW (192.168.2.1)
[tcp:D]network NETMASK (255.255.255.0)
[WIFI_DEVICE:E]l o num:0 127.0.0.1
[WIFI_DEVICE:E]w l num:1 192.168.2.50
[tcp:D]set network GW
[tcp:D]network GW (192.168.2.1)
[tcp:D]network NETMASK (255.255.255.0)
[tcp client] connect:50<192.168.2.49:6666>
[tcp server] listen:51<0.0.0.0:6666>
waitting for client connect...
------------------------------------------------------------
[tcp client] send:TCP TEST cilent send:1
[tcp client] client sendto msg to server 22,waitting server respond msg!!!
[tcp client] rev:
------------------------------------------------------------
[tcp client] send:TCP TEST cilent send:2
[tcp client] client sendto msg to server 22,waitting server respond msg!!!
[tcp client] recieve data fail!
[tcp client] connect:50<192.168.2.49:6666>
connect server failed...1
connect server failed...2
[tcp server] accept <0.0.0.0:0>
-------------------------------------------------------
[tcp server] waitting client msg
------------------------------------------------------------
[tcp client] send:TCP TEST cilent send:1
[tcp client] client sendto msg to server 22,waitting server respond msg!!!
[tcp client] rev:凌智电子服务端
------------------------------------------------------------
[tcp client] send:TCP TEST cilent send:2
[tcp client] client sendto msg to server 22,waitting server respond msg!!!
[tcp server] rev client msg:凌智电子客户端
[tcp server] send msg:I have recieved 14 bytes data! recieved cnt:1
-------------------------------------------------------
[tcp server] waitting client msg
[tcp client] rev:凌智电子服务端
------------------------------------------------------------
[tcp client] send:TCP TEST cilent send:3
[tcp client] client sendto msg to server 22,waitting server respond msg!!!
[tcp server] rev client msg:凌智电子客户端
[tcp server] send msg:I have recieved 14 bytes data! recieved cnt:2
-------------------------------------------------------
[tcp server] waitting client msg
[tcp server] rev client msg:凌智电子客户端
[tcp server] send msg:I have recieved 14 bytes data! recieved cnt:3
-------------------------------------------------------
[tcp server] waitting client msg
当log中出现以下信息表示小凌派的tcp客户端和服务端任务已启动
[tcp client] connect:50<192.168.2.49:6666>
[tcp server] listen:51<0.0.0.0:6666>
此时用网络调试助手查看并收发消息。
确认pc与小凌派在同一局域网，查看PC的IP地址和网关。
原作者：王小彬 Gitee
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