Hi3861 OpenHarmony嵌入式应用入门--TCP Server

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：

1. 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

1. 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 L