#开发板漂流计划#小车控制由简入繁之UDP控制 原创 精华

static_library("car") {
    sources = [
        ......
        "src/wifi_connecter.c",
    ]

}
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    include_dirs = [
        ......
        "//applications/sample/wifi-iot/app/car/include",
        "//foundation/communication/wifi_lite/interfaces/wifiservice",
        "//device/hisilicon/hispark_pegasus/sdk_liteos/third_party/lwip_sack/include",
    ]
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#include "wifi_connecter.h"
......
static void CarDemoTask(void *arg)
{
    ......

    // setup your AP params
    WifiDeviceConfig apConfig = {0};
    strcpy(apConfig.ssid, "SSIDABCD");
    strcpy(apConfig.preSharedKey, "MIMA1234");
    apConfig.securityType = WIFI_SEC_TYPE_PSK;
    int netId = ConnectToHotspot(&apConfig);
    printf("[CarDemo] ConnectToHotspot done netId=%d!\n",netId);

}
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typedef enum {
    /** Invalid security type */
    WIFI_SEC_TYPE_INVALID = -1,
    /** Open */
    WIFI_SEC_TYPE_OPEN,
    /** Wired Equivalent Privacy (WEP) */
    WIFI_SEC_TYPE_WEP,
    /** Pre-shared key (PSK) */
    WIFI_SEC_TYPE_PSK,
    /** Simultaneous Authentication of Equals (SAE) */
    WIFI_SEC_TYPE_SAE,
} WifiSecurityType;
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#include "lwip/sockets.h"

static char response[] = "\nSucess.\n";
static char message[128] = "";
void UdpServer(unsigned short port)
{
    ssize_t retval = 0;
    int needfb = 0;
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0); // UDP socket

    struct sockaddr_in clientAddr = {0};
    socklen_t clientAddrLen = sizeof(clientAddr);
    struct sockaddr_in serverAddr = {0};
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(port);
    serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);

    retval = bind(sockfd, (struct sockaddr *)&serverAddr, sizeof(serverAddr));
    if (retval < 0) {
        printf("bind failed, %ld!\r\n", retval);
        goto do_cleanup;
    }
    printf("bind to port %d success!\r\n", port);

    while(1)
    {
        needfb = 0;
        memset(message, 0, sizeof(message));
        retval = recvfrom(sockfd, message, sizeof(message), 0, (struct sockaddr *)&clientAddr, &clientAddrLen);
        if (retval > 0) {
            printf("recv message {%s} %ld done!\r\n", message, retval);
            printf("peer info: ipaddr = %s, port = %d\r\n", inet_ntoa(clientAddr.sin_addr), ntohs(clientAddr.sin_port));

            if(strncmp("forward", message, 7)== 0) {
                needfb = 1;
                car_go_forward();
            }
            if(strncmp("back", message, 4) == 0) {
                needfb = 1;
                car_go_back();
            }
            if(strncmp("left", message, 4) == 0) {
                needfb = 1;
                car_turn_left();
            }
            if(strncmp("right", message, 5) == 0) {
                needfb = 1;
                car_turn_right();
            }
            if(strncmp("stop", message, 4) == 0) {
                needfb = 1;
                car_stop();
            }
            if(needfb == 1) {
                retval = sendto(sockfd, response, strlen(response), 0, (struct sockaddr *)&clientAddr, sizeof(clientAddr));
                if (retval > 0) {  
                    printf("send response {%s} %ld done!\r\n", response, retval);
                } else {
                    printf("send failed, %ld!\r\n", retval);
                }
            }
        }
    }

do_cleanup:
    printf("do_cleanup...\r\n");
    close(sockfd);
}
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static void CarDemoTask(void *arg)
{
    ......
    UdpServer(62021);
    
    printf("[CarDemo] create CarDemoTask!\n");
}
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import("//build/lite/config/component/lite_component.gni")

lite_component("app") {
    features = [
        "car",
    ]
}
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# CONFIG_PWM_SUPPORT is not set
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CONFIG_PWM_SUPPORT=y
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soon@soon-u20:~/ohos300_iot $ hb set
[OHOS INFO] Input code path: .
OHOS Which product do you need?  wifiiot_hispark_pegasus
soon@soon-u20:~/ohos300_iot $ hb build -b release -f
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