内容介绍

1 前言

本文主要实现了 Funpack第二季第六期 "一起玩开发板" nRF7002-DK 任务二.

基于nRF7002-DK提供的WiFi连接功能，连接网络，并实现远程控制板卡LED和读取按键信息。

本文主要内容包括基于VSCODE的NCS开发环境搭建、基于NCS的WiFi与MQTT连接实现设备远程控制等

2 准备工作

本文当前主要使用到如下资源：

nRF7002 DK
nordic开发板
nRF Connect SDK
NCS v2.4.2
Visual Studio Code with nRF Connect for VS Code extension
nordic基于VSCODE的集成开发环境
MQTT Broker
使用免费开放的 test.mosquitto.org
MQTT客户端
MQTTX - https://mqttx.app/zh

2.1 nRF7002-DK简介

nRF7002 DK 是一个硬件开发平台，可促进 Wi-Fi6 应用的设计和开发。该开发套件 (DK) 将 nRF7002 配套集成电路 (IC) 的 Wi-Fi 6 功能与 nRF5340 片上系统 (SoC) 相结合。
本文主要使用了nRF7002 DK如下功能模块：

nRF5340 双核蓝牙5.3 SoC，作为板子的主控MCU
采用的是双核Arm® Cortex®-M33架构
支持蓝牙低功耗、蓝牙mesh、NFC、Thread和Zigbee等等
nRF7002 Wi-Fi协同IC，通过QSPI接口与主控MCU nRF5340交互。
支持双频 2.4 GHz 和 5 GHz Wi-Fi 6
用户可编程 LED (2) 和按钮 (2)
SEGGER J-Link 板载编程器/调试器
nRF7002 DK 上的接口 MCU 运行 SEGGER J-Link 板载接口固件，用于对 nRF5340 SoC 的固件进行编程和调试

图 1：nRF7002 DK (PCA10143)

2.2 NCS开发环境搭建

NCS是nRF Connect SDK的缩写，是基于zephyr构建的SDK全家桶。 nRF Connect SDK介绍的官方链接:nRF Connect SDK - nordicsemi.com。 NCS官方开发文档链接：https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/getting_started.html

2.2.1 安装nRF Connet for Desktop安装

nRF Connet for Desktop是 Nordic Semiconductor 开发的一款免费工具,可以针对多种无线技术开发和测试应用程序。

下载安装最新版本即可。

https://www.nordicsemi.com/Products/Development-tools/nRF-Connect-for-desktop/Download#infotabs

打开nRF Connet for Desktop, 找到“Toolchain Manager”并安装
打开上述安装好的"Toolchain Manager”界面

安装nRF Connect SDK。Toolchain Manager提供了多个版本SDK，根据需要选择安装（如nRF Connect SDK v2.4.2）

RF Connect SDK的安装包括Toolchains和nrf sdk,zephyr sdk等软件模块，安装过程需要较长时间，可能会因为网络原因，出现安装失败的情况。

2.2.2 安装nRF Command Line Tools

2.2.3 安装VS code

下载地址 https://code.visualstudio.com/

2.2.4 NCS SDK搭建blinky示例

打开"Open VS Code"

首次会跳出安装VS Code插件，选择"Install missing extensions"。

跳转到vscode,点击 nRF Connect for VS Code extension

点击“Create a new application”, “Copy a sample”

右侧搜索框输入"blink"搜索Blinky例程，点击“Blinky Sample”，选择本地保存路径与项目工程文件夹

创建编译“Create new build configuration”

选择Board, 输入 nrf7002,选择 “nrf7002dk_nrf5340_cpuapp

然后点击“Build”

如果板子正常连接电脑后，VSCODE 找不到设备，需设置nRF Connect For VS Code扩展“Device Provider”为 “nrfjprog”，具体如下所示

选择识别到的板子ID，执行下载"Flash"

打开串口工具，选择串口端口号(编号较大的)，波特率115200。重启设备后，LED闪烁，并输出上电信息，如下所示

*** Booting Zephyr OS build v3.3.99-ncs1-1 ***

至此，基于VSCODE的NCS开发环境搭建完成。

3 系统总体功能

3.1 软件系统框图

NCS基于Zephyr系统，提供了丰富的物联网联网能力。

3.2 硬件接口电路

nRF7002 DK板载了主控nRF5340、nRF7002、Jlink、用户按键、LED、NFC等

3.2.1 WIFI接口电路

nRF7002 WiFi模块通过QSPI与nRF5340进行数据交互。

3.2.2 LED接口电路

板载2颗用户LED

3.2.3 按键接口电路

板载2路用户按键，另外还有一路复位按键

4 功能实现

4.1 创建MQTT工程

创建基于WIFI的MQTT工程，以 nrf/samples/net/mqtt作为模版

该示例应用层主要包含6个模块，分别是

Trigger模块：定时触发，向MQTT Broker定期发布消息。同时检测按键按键，也会触发
Sampler模块：当前Trigger触发，采样数据并发送。当前采样数据采用的是一串模拟字符串。
Transport模块：复杂处理MQTT连接，发布消息与接收并解析订阅的消息。本文在此基础上，新增处理LED远程控制与远程读取状态
Network模块：负责WIFI网络连接
LED:根据其他功能模块发出的消息，控制LED的状态
Error:监控其他功能模块发出的报错消息。

4.2 Kconfig配置WIFI SSID与密码

当前示例采用静态方式配置WIFI的SSID与密码。

点击“nRF Kconfig GUI”，进行WIFI参数的静态配置

右侧搜索框输入 wifi, 找到 “Static Wi-Fi network configuration”，输入可用的 WiFi SSID、Password

点击“Save to file”保存到当前工程/prj.conf，查看prj.conf，其新增了CONFIG_WIFI_CREDENTIALS_STATIC_SSID与CONFIG_WIFI_CREDENTIALS_STATIC_PASSWORD等

4.3 按键触发上报服务器与远程按键状态读取

4.3.1 BUTTON设备树定义

button设备树定义如下

    buttons {
        compatible = "gpio-keys";
        button0: button_0 {
            gpios = <&gpio1 8 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
            label = "Push button 1";
        };
        button1: button_1 {
            gpios = <&gpio1 9 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
            label = "Push button 2";
        };
    };

DK Buttons Library 在Zephyr GPIO API之上实现的API，通过读取指定输入引脚逻辑电平

#define DK_NO_BTNS_MSK   (0)
#define DK_BTN1          0
#define DK_BTN2          1

有按键按下的情况下，通过引脚中断回调 button_pressed--> buttons_scan -> gpio_pin_get_dt 通过dk_get_buttons可以获取button1、button2的状态。

4.3.2 kconfig新增按键触发消息与读取按键状态

通过Kconfig，定义一组按键控制命令（字符串），用于按键按下状态上报、按键状态读取。

config BUTTON1_EVENT_PUBLISH_MSG
    string "The message to publish on a button event"
    default "Button 1 Pressed"

config BUTTON2_EVENT_PUBLISH_MSG
    string "The message to publish on a button event"
    default "Button 2 Pressed"

config BUTTON1_EVENT_PUBLISH_MSG_RELEASED
    string "The message to publish on a button event"
    default "Button 1 Released"

config BUTTON2_EVENT_PUBLISH_MSG_RELEASED
    string "The message to publish on a button event"
    default "Button 2 Released"

config BUTTON1_READ_CMD
    string "Command to read BUTTON1"
    default "BUTTON1READ"

config BUTTON2_READ_CMD
    string "Command to read BUTTON2"
    default "BUTTON2READ"

4.3.3 按键触发数据上报服务器

有按键按下，发布按键按下消息


static int message_send_msg(uint8_t *data)
{
    int err;

    err = zbus_chan_pub(&PAYLOAD_CHAN, data, K_SECONDS(1));
    if (err) {
        LOG_ERR("zbus_chan_pub, error: %d", err);
        SEND_FATAL_ERROR();
    }
    return err;
}

static void button_handler(uint32_t button_states, uint32_t has_changed)
{
  switch (has_changed) {
    case DK_BTN1_MSK:
        if (button_states & DK_BTN1_MSK){   
            int err = message_send_msg(CONFIG_BUTTON1_EVENT_PUBLISH_MSG);
            if (err) {
                LOG_ERR("Failed to send message, %d", err);
                return; 
            }
        }
        break;
    case DK_BTN2_MSK:
        if (button_states & DK_BTN2_MSK){   
            int err = message_send_msg(CONFIG_BUTTON2_EVENT_PUBLISH_MSG);
            if (err) {
                LOG_ERR("Failed to send message, %d", err);
                return; 
            }
        }
        break;
    }
}

4.3.4 远程读取按键状态

通过MQTTX客户端发布按键状态读取。板卡接收到订阅消息后，解析该命令，随后发布当前按键状态消息。


static void on_mqtt_publish(struct mqtt_helper_buf topic, struct mqtt_helper_buf payload)
{
    LOG_INF("Received payload: %.*s on topic: %.*s", payload.size,
                             payload.ptr,
                             topic.size,
                             topic.ptr);
    uint32_t button_state;
    int err;
    uint8_t *data_ptr;

    else if(strncmp(payload.ptr,CONFIG_BUTTON1_STATE_READ_CMD,sizeof(CONFIG_BUTTON1_STATE_READ_CMD)-1) ==0){
        button_state=dk_get_buttons();
        if(button_state & DK_BTN1_MSK){
            data_ptr = CONFIG_BUTTON1_EVENT_PUBLISH_MSG;
        }
        else{
            data_ptr = CONFIG_BUTTON1_EVENT_PUBLISH_MSG_RELEASED;
        }
        err = message_send_msg(data_ptr);
        if (err) {
            LOG_ERR("Failed to send message, %d", err);
        }
    }
    else if(strncmp(payload.ptr,CONFIG_BUTTON2_STATE_READ_CMD,sizeof(CONFIG_BUTTON2_STATE_READ_CMD)-1) ==0){
        button_state=dk_get_buttons();
        if(button_state & DK_BTN2_MSK){
            data_ptr = CONFIG_BUTTON2_EVENT_PUBLISH_MSG;
        }
        else{
            data_ptr = CONFIG_BUTTON2_EVENT_PUBLISH_MSG_RELEASED;
        }
        err = message_send_msg(data_ptr);
        if (err) {
            LOG_ERR("Failed to send message, %d", err);
        }
    }
}

4.3 远程控制LED

4.3.1 LED设备树定义

led设备树定义如下所示


    leds {
        compatible = "gpio-leds";
        led0: led_0 {
            gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
            label = "Green LED 0";
        };
        led1: led_1 {
            gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;
            label = "Green LED 1";
        };
    };

DK LED Library 在Zephyr GPIO API之上实现的API，如dk_set_led_on -->dk_set_led -> gpio_pin_set_dt


#define DK_NO_LEDS_MSK    (0)
#define DK_LED1           0
#define DK_LED2           1

4.3.2 kconfig新增LED控制命令

通过Kconfig，定义一组LED控制命令（字符串），用于LED开与关控制。


config TURN_LED1_ON_CMD
    string "Command to turn on LED"
    default "LED1ON"

config TURN_LED1_OFF_CMD
    string "Command to turn off LED"
    default "LED1OFF"

config TURN_LED2_ON_CMD
    string "Command to turn on LED"
    default "LED2ON"

config TURN_LED2_OFF_CMD
    string "Command to turn off LED"
    default "LED2OFF"

4.3.3 远程开关LED

通过MQTTX客户端发布LED1、LED2的打开与关闭命令。板卡接收到订阅消息后，解析该LED控制命令，实现LED远程控制

#define DK_LED1 1
#define DK_LED2 0

static void on_mqtt_publish(struct mqtt_helper_buf topic, struct mqtt_helper_buf payload)
{
    LOG_INF("Received payload: %.*s on topic: %.*s", payload.size,
                             payload.ptr,
                             topic.size,
                             topic.ptr);
    // Control LED1 and LED2 
    if(strncmp(payload.ptr,CONFIG_TURN_LED1_ON_CMD,sizeof(CONFIG_TURN_LED1_ON_CMD)-1) == 0){
        dk_set_led_on(DK_LED1);
    }
    else if(strncmp(payload.ptr,CONFIG_TURN_LED1_OFF_CMD,sizeof(CONFIG_TURN_LED1_OFF_CMD)-1) == 0){
        dk_set_led_off(DK_LED1);
    }
    else if(strncmp(payload.ptr,CONFIG_TURN_LED2_ON_CMD,sizeof(CONFIG_TURN_LED2_ON_CMD)-1) == 0){
        dk_set_led_on(DK_LED2);
    }
    else if(strncmp(payload.ptr,CONFIG_TURN_LED2_OFF_CMD,sizeof(CONFIG_TURN_LED2_OFF_CMD)-1) == 0){
        dk_set_led_off(DK_LED2);
    }
}

5 功能测试

使用MQTTX客户端连接开放的MQTT Broker，然后与nRF7002板卡的MQTT客户端应用程序进行通信。

5.1 建立MQTTX客户端

打开PC端的MQTTX客户端，点击“+”新建连接，在右侧填入MQTT连接的基本信息 Name: 与MQTT协议无关，可任意定义 MQTT Broker 使用免费的test.mosquitto.org Client ID:可以使用默认定义(可任意定义），因为使用的是公共免费MQTT Broker,不要填写容易与他人重复的ID即可。其他先保持默认即可。 nRF7002板卡上电后，自动进行WIFI连接，然后连接到MQTT broker（test.mosquitto.org）

5.2 nRF7002板卡发布消息

nRF7002板卡周期性发布的主题消息“Hello MQTT! Current uptime is: 6180664”。


[01:42:01.021,179] <inf> network: IPv4 address lost
[01:42:01.029,327] <inf> network: Wi-Fi Connected, waiting for IP address
[01:42:01.237,304] <inf> network: IPv4 address acquired
[01:42:06.869,140] <inf> transport: Connected to MQTT broker
[01:42:06.869,171] <inf> transport: Hostname: test.mosquitto.org
[01:42:06.869,201] <inf> transport: Client ID: F4CE3600173C
[01:42:06.869,232] <inf> transport: Port: 1883
[01:42:06.869,232] <inf> transport: TLS: No
[01:42:06.869,293] <inf> transport: Subscribing to: F4CE3600173C/my/subscribe/topic
[01:42:07.071,166] <inf> transport: Subscribed to topic F4CE3600173C/my/subscribe/topic
[01:43:00.673,828] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6180664" on topic: "F4CE3600173C/my/publish/topic"
[01:44:00.673,797] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6240664" on topic: "F4CE3600173C/my/publish/topic"
[01:45:00.673,797] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6300664" on topic: "F4CE3600173C/my/publish/topic"
[01:46:00.673,858] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6360664" on topic: "F4CE3600173C/my/publish/topic"
[01:47:00.673,858] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6420664" on topic: "F4CE3600173C/my/publish/topic"
[01:48:00.667,877] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6480664" on topic: "F4CE3600173C/my/publish/topic"
[01:49:00.674,835] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6540664" on topic: "F4CE3600173C/my/publish/topic"
[01:50:00.674,835] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6600664" on topic: "F4CE3600173C/my/publish/topic"
[01:51:00.674,865] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6660665" on topic: "F4CE3600173C/my/publish/topic"
[01:52:00.674,835] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6720665" on topic: "F4CE3600173C/my/publish/topic"
[01:53:00.670,806] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6780665" on topic: "F4CE3600173C/my/publish/topic"
[01:54:00.674,835] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6840665" on topic: "F4CE3600173C/my/publish/topic"
[01:55:00.674,865] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6900665" on topic: "F4CE3600173C/my/publish/topic"
[01:56:00.674,865] <inf> transport: Published message: "Hello MQTT! Current uptime is: 6960665" on topic: "F4CE3600173C/my/publish/topic"
[01:57:00.667,236] <inf> transport: Published message: "Hello MQTT! Current uptime is: 7020665" on topic: "F4CE3600173C/my/publish/topic"
[01:58:00.674,835] <inf> transport: Published message: "Hello MQTT! Current uptime is: 7080665" on topic: "F4CE3600173C/my/publish/topic"

nRF7002板卡按下key1、key2，发布按键按下。

*** Booting Zephyr OS build v3.3.99-ncs1-1 ***
[00:00:01.476,654] <wrn> wifi_credentials: Cannot retrieve WiFi credentials, no entry found for the provided SSID
[00:00:01.476,715] <inf> wifi_mgmt_ext: Adding statically configured WiFi network [Green-Forest-2G4] to internal list.
[00:00:08.129,516] <inf> network: Wi-Fi Connected, waiting for IP address
[00:00:08.330,871] <inf> network: IPv4 address acquired
[00:00:14.185,699] <inf> transport: Connected to MQTT broker
[00:00:14.185,729] <inf> transport: Hostname: test.mosquitto.org
[00:00:14.185,760] <inf> transport: Client ID: F4CE3600173C
[00:00:14.185,760] <inf> transport: Port: 1883
[00:00:14.185,791] <inf> transport: TLS: No
[00:00:14.185,821] <inf> transport: Subscribing to: F4CE3600173C/my/subscribe/topic
[00:00:14.461,181] <inf> transport: Subscribed to topic F4CE3600173C/my/subscribe/topic
[00:00:37.509,460] <inf> transport: Received payload: LED2ON on topic: F4CE3600173C/my/subscribe/topic
[00:00:52.953,155] <inf> transport: Received payload: LED2OFF on topic: F4CE3600173C/my/subscribe/topic
[00:00:57.459,655] <inf> transport: Received payload: LED1OFF on topic: F4CE3600173C/my/subscribe/topic
[00:01:00.484,832] <inf> transport: Published message: "Hello MQTT! Current uptime is: 60475" on topic: "F4CE3600173C/my/publish/topic"
[00:01:01.860,809] <inf> transport: Published message: "Button 1 Pressed" on topic: "F4CE3600173C/my/publish/topic"
[00:01:11.065,460] <inf> transport: Published message: "Button 2 Pressed" on topic: "F4CE3600173C/my/publish/topic"

5.3 MQTTX客户端发布消息

MQTTX客户端发布“Hello EETree”，关闭LED "LED1OFF"、打开"LED2ON"，读取按键状态"BUTTON1READ"、"BUTTON2READ"等消息，nRF7002板卡返回BUTTON1\2当前按键状态。


*** Booting Zephyr OS build v3.3.99-ncs1-1 ***
[00:00:01.508,026] <wrn> wifi_credentials: Cannot retrieve WiFi credentials, no entry found for the provided SSID
[00:00:01.508,087] <inf> wifi_mgmt_ext: Adding statically configured WiFi network [Green-Forest-2G4] to internal list.
[00:00:08.137,573] <inf> network: Wi-Fi Connected, waiting for IP address
[00:00:08.296,325] <inf> network: IPv4 address acquired
[00:00:13.721,984] <inf> transport: Connected to MQTT broker
[00:00:13.722,015] <inf> transport: Hostname: test.mosquitto.org
[00:00:13.722,045] <inf> transport: Client ID: F4CE3600173C
[00:00:13.722,045] <inf> transport: Port: 1883
[00:00:13.722,076] <inf> transport: TLS: No
[00:00:13.722,106] <inf> transport: Subscribing to: F4CE3600173C/my/subscribe/topic
[00:00:13.923,065] <inf> transport: Subscribed to topic F4CE3600173C/my/subscribe/topic
[00:01:00.516,845] <inf> transport: Published message: "Hello MQTT! Current uptime is: 60507" on topic: "F4CE3600173C/my/publish/topic"
[00:01:09.183,685] <inf> transport: Received payload: LED1OFF on topic: F4CE3600173C/my/subscribe/topic
[00:01:26.375,823] <inf> transport: Received payload: LED2OFF on topic: F4CE3600173C/my/subscribe/topic
[00:01:38.656,341] <inf> transport: Received payload: LED2ON on topic: F4CE3600173C/my/subscribe/topic
[00:01:44.082,733] <inf> transport: Received payload: LED2OFF on topic: F4CE3600173C/my/subscribe/topic
[00:01:54.193,817] <inf> transport: Published message: "Button 1 Pressed" on topic: "F4CE3600173C/my/publish/topic"
[00:01:57.622,802] <inf> transport: Published message: "Button 2 Pressed" on topic: "F4CE3600173C/my/publish/topic"
[00:01:58.304,412] <inf> transport: Published message: "Button 1 Pressed" on topic: "F4CE3600173C/my/publish/topic"
[00:01:59.715,820] <inf> transport: Published message: "Button 2 Pressed" on topic: "F4CE3600173C/my/publish/topic"
[00:02:00.507,720] <inf> transport: Published message: "Hello MQTT! Current uptime is: 120507" on topic: "F4CE3600173C/my/publish/topic"
[00:02:10.993,774] <inf> transport: Received payload: LED2ON on topic: F4CE3600173C/my/subscribe/topic
[00:02:37.300,872] <inf> transport: Received payload: LED1ON on topic: F4CE3600173C/my/subscribe/topic
[00:02:37.498,626] <inf> transport: Received payload: LED1ON on topic: F4CE3600173C/my/subscribe/topic
[00:02:37.499,908] <inf> transport: Received payload: LED1OFF on topic: F4CE3600173C/my/subscribe/topic
[00:02:37.500,183] <inf> transport: Received payload: LED1ON on topic: F4CE3600173C/my/subscribe/topic
[00:02:37.500,488] <inf> transport: Received payload: LED1ON on topic: F4CE3600173C/my/subscribe/topic
[00:02:52.747,192] <inf> transport: Received payload: LED1OFF on topic: F4CE3600173C/my/subscribe/topic
[00:02:57.044,036] <inf> transport: Received payload: LED2OFF on topic: F4CE3600173C/my/subscribe/topic
[00:03:00.514,984] <inf> transport: Published message: "Hello MQTT! Current uptime is: 180507" on topic: "F4CE3600173C/my/publish/topic"
[00:03:53.331,634] <inf> transport: Received payload: BUTTON1READ on topic: F4CE3600173C/my/subscribe/topic
[00:03:53.333,770] <inf> transport: Published message: "Button 1 Released" on topic: "F4CE3600173C/my/publish/topic"
[00:04:00.516,845] <inf> transport: Published message: "Hello MQTT! Current uptime is: 240507" on topic: "F4CE3600173C/my/publish/topic"
[00:04:03.970,703] <inf> transport: Received payload: BUTTON2READ on topic: F4CE3600173C/my/subscribe/topic
[00:04:03.973,205] <inf> transport: Published message: "Button 2 Released" on topic: "F4CE3600173C/my/publish/topic"
[00:05:00.516,845] <inf> transport: Published message: "Hello MQTT! Current uptime is: 300507" on topic: "F4CE3600173C/my/publish/topic"

nRF7002板卡输出收到订阅的消息“Hello EETree”，并根据led控制命令，打开与关闭板载led1、led2

*** Booting Zephyr OS build v3.3.99-ncs1-1 ***
[00:00:01.525,604] <wrn> wifi_credentials: Cannot retrieve WiFi credentials, no entry found for the provided SSID
[00:00:01.525,634] <inf> wifi_mgmt_ext: Adding statically configured WiFi network [Green-Forest-2G4] to internal list.
[00:00:08.168,212] <inf> network: Wi-Fi Connected, waiting for IP address
[00:00:08.393,890] <inf> network: IPv4 address acquired
[00:00:14.237,823] <inf> transport: Connected to MQTT broker
[00:00:14.237,854] <inf> transport: Hostname: test.mosquitto.org
[00:00:14.237,884] <inf> transport: Client ID: F4CE3600173C
[00:00:14.237,884] <inf> transport: Port: 1883
[00:00:14.237,915] <inf> transport: TLS: No
[00:00:14.237,976] <inf> transport: Subscribing to: F4CE3600173C/my/subscribe/topic
[00:00:14.516,967] <inf> transport: Subscribed to topic F4CE3600173C/my/subscribe/topic
[00:00:00.507,110] <inf> fs_nvs: 6 Sectors of 4096 bytes
[00:00:00.507,141] <inf> fs_nvs: alloc wra: 0, fe8
[00:00:00.507,171] <inf> fs_nvs: data wra: 0, 0
*** Booting Zephyr OS build v3.3.99-ncs1-1 ***
[00:00:01.510,925] <wrn> wifi_credentials: Cannot retrieve WiFi credentials, no entry found for the provided SSID
[00:00:01.510,955] <inf> wifi_mgmt_ext: Adding statically configured WiFi network [Green-Forest-2G4] to internal list.
[00:00:08.149,932] <inf> network: Wi-Fi Connected, waiting for IP address
[00:00:08.362,274] <inf> network: IPv4 address acquired
[00:00:13.896,179] <inf> transport: Connected to MQTT broker
[00:00:13.896,209] <inf> transport: Hostname: test.mosquitto.org
[00:00:13.896,240] <inf> transport: Client ID: F4CE3600173C
[00:00:13.896,270] <inf> transport: Port: 1883
[00:00:13.896,270] <inf> transport: TLS: No
[00:00:13.896,331] <inf> transport: Subscribing to: F4CE3600173C/my/subscribe/topic
[00:00:14.093,536] <inf> transport: Subscribed to topic F4CE3600173C/my/subscribe/topic
[00:00:29.038,116] <inf> transport: Received payload: 
                                                      Hello EETree on topic: F4CE3600173C/my/subscribe/topic
[00:01:00.518,829] <inf> transport: Published message: "Hello MQTT! Current uptime is: 60510" on topic: "F4CE3600173C/my/publish/topic"
[00:01:10.797,698] <inf> transport: Received payload: LED1OFF on topic: F4CE3600173C/my/subscribe/topic
[00:01:22.653,778] <inf> transport: Received payload: LED2ON on topic: F4CE3600173C/my/subscribe/topic
[00:02:00.519,805] <inf> transport: Published message: "Hello MQTT! Current uptime is: 120510" on topic: "F4CE3600173C/my/publish/topic"
[00:03:00.511,871] <inf> transport: Published message: "Hello MQTT! Current uptime is: 180510" on topic: "F4CE3600173C/my/publish/topic"
[00:04:00.513,458] <inf> transport: Published message: "Hello MQTT! Current uptime is: 240510" on topic: "F4CE3600173C/my/publish/topic"

6 参考资料

nrf7002-mqtt over wifi
https://www.zephyrproject.org/implementing-mqtt-over-wi-fi-on-the-nrf7002-dev-kit/
MQTT over WiFi 示例演练
NCS官方开发文档
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/getting_started.html

7 心得体会

通过参与nRF7002-DK 一起玩活动，学习了nRF7002-DK板卡的丰富软硬件资源，nRF7002-DK作为硬件开发平台非常强大，也进一步熟悉了NCS开发方式，NCS基于物联网操作系统zephyr，整个系统非常庞大，具备强大的物联网连接能力、满足不同等级的安全能力、优异的可移植性、行业领先代码开发与管理理念等等，同时提供了丰富的示例工程，使得应用开发、维护、迭代等非常方便与快捷，后续还需不断学习探索。

在此非常感谢主办方举办Funpack有趣活动