AliOS Things中提供了一個網絡適配框架SAL(Socket Adapter Layer)組件,用來加速MCU+通信連接芯片的應用場景開發和部署。我們使用這個框架來實現私有socket連接的建立。
EMW3060上運行了LwIP協議棧，可以使用Linux上標準的API接口創建socket連接，示例代碼可以參考networkapp工程:alios/app/example/networkapp
/*
* Copyright (C) 2015-2017 Alibaba Group Holding Limited
*/
#include <stdio.h>
#include <string.h>
#include <aos/aos.h>
#include <aos/network.h>
#include <netmgr.h>
#ifdef AOS_ATCMD
#include <atparser.h>
#endif
#define BUFFER_MAX_SIZE 1512
#define TCP_DEMO_TARGET_TCP_PORT 443
#ifndef IPADDR_NONE
#define IPADDR_NONE ((uint32_t)0xffffffffUL)
#endif
static int networktestcmd_tcp_client(int argc, char **argv)
{
int ret = 0;
int readlen = 0;
int fd = 0;
int time = 0;
int testtimes = 1;
char *pbuf = NULL;
char *pcipaddr = NULL;
char *pcdestport = NULL;
char *pcdata = NULL;
char *pctesttime = NULL;
struct sockaddr_in addr;
struct timeval timeout;
if (argc < 5){
printf("invalid input tcp clinet test command \r\n");
return -1;
}
pcipaddr = argv[2]; //ip addr
pcdestport = argv[3];//port
pcdata = argv[4];
if (argc == 6){
pctesttime = argv[5];
testtimes = atoi(pctesttime);
if (0 == testtimes){
printf("invalid input tcp client test time %s \r\n", pctesttime);
return -1;
}
}
memset(&addr, 0, sizeof(addr));
addr.sin_port = htons((short)atoi(pcdestport));
if (0 == addr.sin_port){
printf("invalid input port info %s \r\n", pcdestport);
return -1;
}
addr.sin_addr.s_addr = inet_addr(pcipaddr);
if (IPADDR_NONE == addr.sin_addr.s_addr){
printf("invalid input addr info %s \r\n", pcipaddr);
return -1;
}
addr.sin_family = AF_INET;
fd = socket(AF_INET,SOCK_STREAM,0);
if (fd < 0){
printf("fail to creat socket errno = %d \r\n", errno);
return -1;
}
timeout.tv_sec = 30;
timeout.tv_usec = 0;
if (setsockopt (fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout,
sizeof(timeout)) < 0) {
printf("setsockopt failed, errno: %d\r\n", errno);
goto err;
}
if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
printf("Connect failed, errno = %d, ip %s port %s \r\n", errno, pcipaddr, pcdestport);
goto err;
}
pbuf = aos_malloc(BUFFER_MAX_SIZE);
if (NULL == pbuf){
printf("fail to malloc memory %d at %s %d \r\n", BUFFER_MAX_SIZE, __FUNCTION__, __LINE__);
goto err;
}
while(1){
// send-recv
if ((ret = send(fd, pcdata, strlen(pcdata), 0)) <= 0) {
printf("send data failed, errno = %d. for the %d time \r\n", errno, time);
goto err;
}
memset(pbuf, 0, BUFFER_MAX_SIZE);
readlen = read(fd, pbuf, BUFFER_MAX_SIZE - 1);
if (readlen < 0){
printf("recv failed, errno = %d.\r\n", errno);
goto err;
}
if (readlen == 0){
printf("recv buf len is %d \r\n", readlen);
break;
}
printf("recv server %d time reply len %d \r\n", time, readlen);
time++;
if (time >= testtimes){
break;
}
}
close(fd);
aos_free(pbuf);
return 0;
err:
close(fd);
if (NULL != pbuf){
aos_free(pbuf);
}
return -1;
}
static int networktestcmd_udp_client(int argc, char **argv)
{
int ret = 0;
int fd = 0;
int testtimes = 1;
char *pcipaddr = NULL;
char *pcdestport = NULL;
char *pcdata = NULL;
char *pctesttime = NULL;
struct sockaddr_in addr;
if (argc < 5){
printf("invalid input udp clinet test command \r\n");
return -1;
}
pcipaddr = argv[2];
pcdestport = argv[3];
pcdata = argv[4];
if (argc == 6){
pctesttime = argv[5];
testtimes = atoi(pctesttime);
if (testtimes <= 0){
printf("invalid input udp client test time %s \r\n", pctesttime);
return -1;
}
}
memset(&addr, 0, sizeof(addr));
addr.sin_port = htons((short)atoi(pcdestport));
if (0 == addr.sin_port){
printf("invalid input port info %s \r\n", pcdestport);
return -1;
}
addr.sin_addr.s_addr = inet_addr(pcipaddr);
if (IPADDR_NONE == addr.sin_addr.s_addr){
printf("invalid input addr info %s \r\n", pcipaddr);
return -1;
}
addr.sin_family = AF_INET;
fd = socket(AF_INET,SOCK_DGRAM,0);
if (fd < 0){
printf("fail to creat socket errno = %d \r\n", errno);
return -1;
}
while(testtimes > 0) {
ret = sendto(fd, pcdata, strlen(pcdata), 0, (struct sockaddr*)&addr, sizeof(struct sockaddr_in));
if (ret < 0){
printf("udp sendto failed, errno = %d.", errno);
close(fd);
return -1;
}
testtimes--;
}
close(fd);
return 0;
}
static int networktestcmd_domain(int argc, char **argv)
{
char *pcdomain = NULL;
char *pcdestport = NULL;
int port = 0;
int fd = 0;
struct hostent *host = NULL;
struct sockaddr_in server_addr;
if (argc < 3){
printf("network domain test invalid input \r\n");
return -1;
}
pcdomain = argv[2]; //addr
if (argc > 3){
pcdestport = argv[3]; //端口
port = atoi(pcdestport);
if (port == 0){
printf("invalid input domain dest port %s \r\n", pcdestport);
return -1;
}
}
if ((host = gethostbyname(pcdomain)) == NULL) {
printf("gethostbyname failed, errno: %d domain %s \r\n", errno, pcdomain);
return -1;
}
printf("get target IP is %d.%d.%d.%d\n", (unsigned char)((*(unsigned long *)(host->h_addr) & 0x000000ff) >> 0),
(unsigned char)((*(unsigned long *)(host->h_addr) & 0x0000ff00) >> 8),
(unsigned char)((*(unsigned long *)(host->h_addr) & 0x00ff0000) >> 16),
(unsigned char)((*(unsigned long *)(host->h_addr) & 0xff000000) >> 24));
if (port){
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
printf("Socket failed, errno: %d \r\n", errno);
return -1;
}
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
server_addr.sin_addr = *((struct in_addr *)host->h_addr);
printf("connect to ip 0x%x port 0x%x \r\n", server_addr.sin_addr.s_addr, server_addr.sin_port);
if (connect(fd, (struct sockaddr *) (&server_addr),
sizeof(struct sockaddr)) == -1) {
printf("Connect failed, errno: %d\r\n", errno);
close(fd);
return -1;
}
close(fd);
}
return 0;
}
static void handle_networktestcmd(char *pwbuf, int blen, int argc, char **argv)
{
char *ptype = NULL;
int ret = 0;
if (argc < 2 || NULL == argv){
printf("invalid input netword test command argc %d argv %p \r\n", argc, argv);
return;
}
ptype = argv[1];
/* TCP client case */
if (strcmp(ptype, "tcp_c") == 0) {
ret = networktestcmd_tcp_client(argc, argv);
if (ret){
printf("fail to execute tcp client test command \r\n");
return;
}
} else if (strcmp(ptype, "udp_c") == 0) {
ret = networktestcmd_udp_client(argc, argv);
if (ret){
printf("fail to execute udp client test command \r\n");
return;
}
} else if (strcmp(ptype, "domain") == 0){
ret = networktestcmd_domain(argc, argv);
if (ret){
printf("fail to execute domain test commnad \r\n");
return;
}
}else {
printf("invalid netword test command input \r\n");
}
printf("network command test successed \r\n");
}
static struct cli_command networktestcmds[] = {
{
.name = "network",
.help = "netowork { tcp_c|udp_c remote_ip remote_port data [times] } | { domain domain_info [ remote_port ]}",
.function = handle_networktestcmd
}
};
static void wifi_event_handler(input_event_t *event, void *priv_data)
{
if (event->type != EV_WIFI) return;
if (event->code == CODE_WIFI_ON_PRE_GOT_IP)
LOG("Hello, WiFi PRE_GOT_IP event!");
if (event->code == CODE_WIFI_ON_GOT_IP){
aos_cli_register_commands((const struct cli_command *)&networktestcmds[0],
sizeof(networktestcmds) / sizeof(networktestcmds[0]));
LOG("Hello, WiFi GOT_IP event!");
}
}
static void app_delayed_action(void *arg)
{
LOG("%s:%d %s\r\n", __func__, __LINE__, aos_task_name());
//aos_post_delayed_action(5000, app_delayed_action, NULL);
}
int application_start(int argc, char *argv[])
{
#if AOS_ATCMD
at.set_mode(ASYN);
at.init(AT_RECV_PREFIX, AT_RECV_SUCCESS_POSTFIX,
AT_RECV_FAIL_POSTFIX, AT_SEND_DELIMITER, 1000);
#endif
#ifdef WITH_SAL
sal_init();
#endif
aos_register_event_filter(EV_WIFI, wifi_event_handler, NULL);
netmgr_init();
netmgr_start(false);
aos_post_delayed_action(1000, app_delayed_action, NULL);
aos_loop_run();
return 0;
}
在alios things 中封裝了SOCKET接口工具，也可以直接使用封裝好的工具接口，實現的工具接口位於utils_net.c文件中，在該文件中封裝了ITLS，ssl和明文的傳輸方式。
示例：
static void zbSocSocketReConnect(void *arg)
{
int ret = 0;
utils_network_t *pNwk = (utils_network_t*)arg;
zlog_debug("zbSocSocketReConnect %x",pNwk->handle);
if(pNwk->handle > 0)
{
aos_cancel_poll_read_fd(pNwk->handle, zbSocSocketReadCb, pNwk);
pNwk->disconnect(pNwk);
}
//連接服務器
ret = zbSocSocketConnect();
if(ret) //連接失敗，啓動一個定時器，延遲SOC_RECONNECT_TIMEOUT時間後繼續嘗試連接
{
aos_post_delayed_action(SOC_RECONNECT_TIMEOUT, zbSocSocketReConnect, pNwk);
}
}
static void zbSocSocketReadCb(int fd, void *arg)
{
uint8_t ch = 0;
int readLen = 0;
utils_network_t *pNwk = (utils_network_t*)arg;
readLen = pNwk->read(pNwk,&ch,1,500);
if( 0 > readLen )
{
if(-1 == readLen)
{
zlog_error("connection is closed");
//刪除事件監聽
aos_cancel_poll_read_fd(pNwk->handle, zbSocSocketReadCb, pNwk);
//關閉連接
pNwk->disconnect(pNwk);
//SOC_RECONNECT_TIMEOUT事件後重新啓動連接
aos_post_delayed_action(SOC_RECONNECT_TIMEOUT, zbSocSocketReConnect, pNwk);
return;
}else{
zlog_error("read errors %d",readLen);
}
}else if(1 != readLen){
zlog_debug("read error %d",readLen);
return;
}
zlog_debug("revice data: %x ",ch);
}
static int zbSocSocketConnect(void)
{
int ret = 0;
utils_network_t *pNwk = &network;
if(pNwk->handle != 0)
{
zlog_info("tcp is connected");
return 0;
}
//初始化utils_network_t 結構體
ret = iotx_net_init(pNwk,TCP_DOMIN,TCP_PORT,NULL,NULL);
if(0 != ret)
{
zlog_error("iotx_net_init failed %d",ret);
return -1;
}
//連接網絡
ret = pNwk->connect(pNwk);
if(0 != ret)
{
zlog_error("socket connect error %d",ret);
pNwk->disconnect(pNwk);
return -1;
}
//使用yloop監聽socket可讀事件
if(aos_poll_read_fd(pNwk->handle,zbSocSocketReadCb,pNwk) < 0)
{
zlog_error("aos_poll_read_fd failed, errno: %d", errno);
pNwk->disconnect(pNwk);
return -1;
}
return 0;
}