Hi3861 OpenHarmony嵌入式应用入门--TCP Server-EW帮帮网

本篇使用的是lwip编写tcp服务端。需要提前准备好一个PARAM_HOTSPOT_SSID宏定义的热点，并且密码为PARAM_HOTSPOT_PSK

LwIP简介

LwIP是什么？

A Lightweight TCP/IP stack 一个轻量级的TCP/IP协议栈

详细介绍请参考LwIP项目官网：lwIP - A Lightweight TCP/IP stack - Summary [Savannah]

LwIP在openharmony上的应用情况

目前，openharmony源码树有两份LwIP：

third_party/lwip

- 源码形式编译
- 供liteos-a内核使用
- 还有一部分代码在kernel/liteos_a中，一起编译

vendor/hisi/hi3861/hi3861/third_party/lwip_sack

- hi3861-sdk的一部分
- 静态库形式编译
- 不可修改配置
- 可以查看当前配置（vend

LwIP Socket API编程主要是6个步骤：

创建Tcp Server Socket：socket

绑定指定的IP和Port：bind

设置socket为监听状态：listen

阻塞方式等待client连接：accept

阻塞方式receive client的消息：recv

调用send发送消息给TCP Client

修改网络参数

在Hi3861开发板上运行上述四个测试程序之前，需要根据你的无线路由、Linux系统IP修改 net_params.h文件的相关代码：

PARAM_HOTSPOT_SSID 修改为你的热点名称
PARAM_HOTSPOT_PSK 修改为你的热点密码；

代码编写

修改D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\BUILD.gn文件

# Copyright (c) 2023 Beijing HuaQing YuanJian Education Technology Co., Ltd
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#    http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. 

import("//build/lite/config/component/lite_component.gni")

lite_component("demo") {
  features = [
    #"base_00_helloworld:base_helloworld_example",
    #"base_01_led:base_led_example",
    #"base_02_loopkey:base_loopkey_example",
    #"base_03_irqkey:base_irqkey_example",
    #"base_04_adc:base_adc_example",
    #"base_05_pwm:base_pwm_example",
    #"base_06_ssd1306:base_ssd1306_example",
    #"kernel_01_task:kernel_task_example",
    #"kernel_02_timer:kernel_timer_example",
    #"kernel_03_event:kernel_event_example",
    #"kernel_04_mutex:kernel_mutex_example",
    #"kernel_05_semaphore_as_mutex:kernel_semaphore_as_mutex_example",
    #"kernel_06_semaphore_for_sync:kernel_semaphore_for_sync_example",
    #"kernel_07_semaphore_for_count:kernel_semaphore_for_count_example",
    #"kernel_08_message_queue:kernel_message_queue_example",
    #"wifi_09_hotspot:wifi_hotspot_example",
    #"wifi_10_sta:wifi_sta_example",
    "tcp_11_server:tcp_server_example",
  ]
}

创建D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\tcp_11_server文件夹

文件夹中创建D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\tcp_11_server\BUILD.gn文件

#Copyright (C) 2021 HiHope Open Source Organization .
#Licensed under the Apache License, Version 2.0 (the "License");
#you may not use this file except in compliance with the License.
#You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
#Unless required by applicable law or agreed to in writing, software
#distributed under the License is distributed on an "AS IS" BASIS,
#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#See the License for the specific language governing permissions and
#
#limitations under the License.

static_library("tcp_server_example") {
    # uncomment one of following line, to enable one test:
    sources = ["tcp_server_example.c"]

    sources += ["wifi_connecter.c"]
    include_dirs = [
        "//utils/native/lite/include",
        "//kernel/liteos_m/kal",
        "//foundation/communication/wifi_lite/interfaces/wifiservice",
    ]
}

添加了wifi_connecter.c文件的编译，这个文件中有链接wifi的函数。

文件夹中创建D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\tcp_11_server\net_common.h文件，文件主要引入一些头文件。

/*
 * Copyright (C) 2021 HiHope Open Source Organization .
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 *
 * limitations under the License.
 */

#ifndef NET_COMMON_H
#define NET_COMMON_H

// __arm__ and __aarch64__ for HarmonyOS with liteos-a kernel
// __i386__ and __x86_64__ for Unix like OS
#if defined(__arm__) || defined(__aarch64__) || defined(__i386__) || defined(__x86_64__)
#define HAVE_BSD_SOCKET 1
#else
#define HAVE_BSD_SOCKET 0
#endif

#if defined(__riscv) // for wifiiot(HarmonyOS on Hi3861 with liteos-m kernel)
#define HAVE_LWIP_SOCKET 1
#else
#define HAVE_LWIP_SOCKET 0
#endif

#if HAVE_BSD_SOCKET
#include <sys/types.h>  // for AF_INET SOCK_STREAM
#include <sys/socket.h> // for socket
#include <netinet/in.h> // for sockaddr_in
#include <arpa/inet.h> // for inet_pton
#elif HAVE_LWIP_SOCKET
#include "lwip/sockets.h"
#ifndef close
#define close(fd) lwip_close(fd)
#endif
#else
#error "Unknow platform!"
#endif

#endif  // NET_COMMON_H

文件夹中创建D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\tcp_11_server\wifi_connecter.h文件，该头文件包含wifi连接的宏。

/*
 * Copyright (C) 2021 HiHope Open Source Organization .
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 *
 * limitations under the License.
 */

#ifndef WIFI_CONNECTER_H
#define WIFI_CONNECTER_H

#include "wifi_device.h"

#ifndef PARAM_HOTSPOT_SSID
#define PARAM_HOTSPOT_SSID "HarmonyOS"   // your AP SSID
#endif

#ifndef PARAM_HOTSPOT_PSK
#define PARAM_HOTSPOT_PSK  "1234567890"  // your AP PSK
#endif

#ifndef PARAM_HOTSPOT_TYPE
#define PARAM_HOTSPOT_TYPE WIFI_SEC_TYPE_PSK // defined in wifi_device_config.h
#endif

#ifndef PARAM_SERVER_ADDR
#define PARAM_SERVER_ADDR "192.168.1.100" // your PC IP address
#endif

#ifndef PARAM_SERVER_PORT
#define PARAM_SERVER_PORT 5678
#endif

int ConnectToHotspot(WifiDeviceConfig* apConfig);

void DisconnectWithHotspot(int netId);

#endif  // WIFI_CONNECTER_H

文件夹中创建D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\tcp_11_server\wifi_connecter.c文件，wifi连接的实现。

/*
 * Copyright (C) 2021 HiHope Open Source Organization .
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 *
 * limitations under the License.
 */

#include "wifi_device.h"
#include "cmsis_os2.h"

#include "lwip/netifapi.h"
#include "lwip/api_shell.h"

#define IDX_0          0
#define IDX_1          1
#define IDX_2          2
#define IDX_3          3
#define IDX_4          4
#define IDX_5          5
#define DELAY_TICKS_10     (10)
#define DELAY_TICKS_100    (100)

static void PrintLinkedInfo(WifiLinkedInfo* info)
{
    if (!info) return;

    static char macAddress[32] = {0};
    unsigned char* mac = info->bssid;
    snprintf(macAddress, sizeof(macAddress), "%02X:%02X:%02X:%02X:%02X:%02X",
        mac[IDX_0], mac[IDX_1], mac[IDX_2], mac[IDX_3], mac[IDX_4], mac[IDX_5]);
    printf("bssid: %s, rssi: %d, connState: %d, reason: %d, ssid: %s\r\n",
        macAddress, info->rssi, info->connState, info->disconnectedReason, info->ssid);
}

static volatile int g_connected = 0;

static void OnWifiConnectionChanged(int state, WifiLinkedInfo* info)
{
    if (!info) return;

    printf("%s %d, state = %d, info = \r\n", __FUNCTION__, __LINE__, state);
    PrintLinkedInfo(info);

    if (state == WIFI_STATE_AVALIABLE) {
        g_connected = 1;
    } else {
        g_connected = 0;
    }
}

static void OnWifiScanStateChanged(int state, int size)
{
    printf("%s %d, state = %X, size = %d\r\n", __FUNCTION__, __LINE__, state, size);
}

static WifiEvent g_defaultWifiEventListener = {
    .OnWifiConnectionChanged = OnWifiConnectionChanged,
    .OnWifiScanStateChanged = OnWifiScanStateChanged
};

static struct netif* g_iface = NULL;

err_t netifapi_set_hostname(struct netif *netif, char *hostname, u8_t namelen);

int ConnectToHotspot(WifiDeviceConfig* apConfig)
{
    WifiErrorCode errCode;
    int netId = -1;

    errCode = RegisterWifiEvent(&g_defaultWifiEventListener);
    printf("RegisterWifiEvent: %d\r\n", errCode);

    errCode = EnableWifi();
    printf("EnableWifi: %d\r\n", errCode);

    errCode = AddDeviceConfig(apConfig, &netId);
    printf("AddDeviceConfig: %d\r\n", errCode);

    g_connected = 0;
    errCode = ConnectTo(netId);
    printf("ConnectTo(%d): %d\r\n", netId, errCode);

    while (!g_connected) { // wait until connect to AP
        osDelay(DELAY_TICKS_10);
    }
    printf("g_connected: %d\r\n", g_connected);

    g_iface = netifapi_netif_find("wlan0");
    if (g_iface) {
        err_t ret = 0;
        char* hostname = "rtplay";
        ret = netifapi_set_hostname(g_iface, hostname, strlen(hostname));
        printf("netifapi_set_hostname: %d\r\n", ret);

        ret = netifapi_dhcp_start(g_iface);
        printf("netifapi_dhcp_start: %d\r\n", ret);

        osDelay(DELAY_TICKS_100); // wait DHCP server give me IP
#if 1
        ret = netifapi_netif_common(g_iface, dhcp_clients_info_show, NULL);
        printf("netifapi_netif_common: %d\r\n", ret);
#else
        // 下面这种方式也可以打印 IP、网关、子网掩码信息
        ip4_addr_t ip = {0};
        ip4_addr_t netmask = {0};
        ip4_addr_t gw = {0};
        ret = netifapi_netif_get_addr(g_iface, &ip, &netmask, &gw);
        if (ret == ERR_OK) {
            printf("ip = %s\r\n", ip4addr_ntoa(&ip));
            printf("netmask = %s\r\n", ip4addr_ntoa(&netmask));
            printf("gw = %s\r\n", ip4addr_ntoa(&gw));
        }
        printf("netifapi_netif_get_addr: %d\r\n", ret);
#endif
    }
    return netId;
}

void DisconnectWithHotspot(int netId)
{
    if (g_iface) {
        err_t ret = netifapi_dhcp_stop(g_iface);
        printf("netifapi_dhcp_stop: %d\r\n", ret);
    }

    WifiErrorCode errCode = Disconnect(); // disconnect with your AP
    printf("Disconnect: %d\r\n", errCode);

    errCode = UnRegisterWifiEvent(&g_defaultWifiEventListener);
    printf("UnRegisterWifiEvent: %d\r\n", errCode);

    RemoveDevice(netId); // remove AP config
    printf("RemoveDevice: %d\r\n", errCode);

    errCode = DisableWifi();
    printf("DisableWifi: %d\r\n", errCode);
}

文件夹中创建D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\tcp_11_server\tcp_server_example.c文件

/*
 * Copyright (C) 2021 HiHope Open Source Organization .
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 *
 * limitations under the License.
 */

#include <errno.h>
#include <stdio.h>
#include <string.h>
// #include <stddef.h>
#include <unistd.h>
#include "ohos_init.h"
#include "cmsis_os2.h"

#include "net_common.h"
#include "wifi_connecter.h"

#define DELAY_1S  (1)
#define STACK_SIZE         (10240)
#define DELAY_TICKS_10     (10)
#define DELAY_TICKS_100    (100)

static char request[128] = "";
void TcpServerTest(void)
{
    WifiDeviceConfig config = {0};

    // 准备AP的配置参数
    // strcpy(config.ssid, PARAM_HOTSPOT_SSID);
    // strcpy(config.preSharedKey, PARAM_HOTSPOT_PSK);
    strcpy_s(config.ssid, WIFI_MAX_SSID_LEN, PARAM_HOTSPOT_SSID);
    strcpy_s(config.preSharedKey, WIFI_MAX_KEY_LEN, PARAM_HOTSPOT_PSK);
    config.securityType = PARAM_HOTSPOT_TYPE;

    osDelay(DELAY_TICKS_10);

    int netId = ConnectToHotspot(&config);

    ssize_t retval = 0;
    int backlog = 1;
    int sockfd = socket(AF_INET, SOCK_STREAM, 0); // TCP socket
    int connfd = -1;

    struct sockaddr_in clientAddr = {0};
    socklen_t clientAddrLen = sizeof(clientAddr);
    struct sockaddr_in serverAddr = {0};
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(PARAM_SERVER_PORT);  // 端口号，从主机字节序转为网络字节序
    serverAddr.sin_addr.s_addr = htonl(INADDR_ANY); // 允许任意主机接入， 0.0.0.0

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

    retval = listen(sockfd, backlog); // 开始监听
    if (retval < 0) {
        printf("listen failed!\r\n");
        goto do_cleanup;
    }
    printf("listen with %d backlog success!\r\n", backlog);

    // 接受客户端连接，成功会返回一个表示连接的 socket ， clientAddr 参数将会携带客户端主机和端口信息 ；失败返回 -1
    // 此后的 收、发 都在 表示连接的 socket 上进行；之后 sockfd 依然可以继续接受其他客户端的连接，
    //  UNIX系统上经典的并发模型是“每个连接一个进程”——创建子进程处理连接，父进程继续接受其他客户端的连接
    //  鸿蒙liteos-a内核之上，可以使用UNIX的“每个连接一个进程”的并发模型
    //     liteos-m内核之上，可以使用“每个连接一个线程”的并发模型
    connfd = accept(sockfd, (struct sockaddr *)&clientAddr, &clientAddrLen);
    if (connfd < 0) {
        printf("accept failed, %d, %d\r\n", connfd, errno);
        goto do_cleanup;
    }
    printf("accept success, connfd = %d!\r\n", connfd);
    printf("client addr info: host = %s, port = %hu\r\n", inet_ntoa(clientAddr.sin_addr), ntohs(clientAddr.sin_port));

    // 后续 收、发 都在 表示连接的 socket 上进行；
    retval = recv(connfd, request, sizeof(request), 0);
    if (retval < 0) {
        printf("recv request failed, %ld!\r\n", retval);
        goto do_disconnect;
    }
    printf("recv request{%s} from client done!\r\n", request);

    retval = send(connfd, request, strlen(request), 0);
    if (retval <= 0) {
        printf("send response failed, %ld!\r\n", retval);
        goto do_disconnect;
    }
    printf("send response{%s} to client done!\r\n", request);

do_disconnect:
    sleep(DELAY_1S);
    close(connfd);
    sleep(DELAY_1S); // for debug

do_cleanup:
    printf("do_cleanup...\r\n");

    close(sockfd);

    DisconnectWithHotspot(netId);
}

SYS_RUN(TcpServerTest);

使用build，编译成功后，使用upload进行烧录。

Hi3861 OpenHarmony嵌入式应用入门--TCP Server

LwIP简介

LwIP Socket API编程主要是6个步骤：

修改网络参数

代码编写

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