• 1、下载代码

mkdir xr806_openharmony
cd xr806_openharmony
repo init -u ssh://git@gitee.com/openharmony-sig/manifest.git -b OpenHarmony_1.0.1_release --no-repo-verify -m devboard_xr806.xml
repo sync -c
repo forall -c 'git lfs pull'   
**最近仓库在整合，如果下载不了可以去论坛找一下临时仓替换即可**

• 2、环境配置

https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/quickstart-lite-env-setup.md#/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/quickstart-lite-env-setup-linux.md

• 3、编译准备

https://xr806.docs.aw-ol.com/study/soft_compile/

要注意的是教程里面的这一步文件名是错的，要把deconfig替换成defconfig

之后的make menuconfig这一步不用修改，直接选择save生成.config文件即可

如果出现了

可以打开
/device/xradio/xr806/xr_shylark/project/image_cfg/readme.md
查看解决教程

或者根据报错代码修改
/device/xradio/xr806/xr_shylark/project/demo/wlan_ble_demo/image/xr806/image/image_wlan_ble.cfg文件
这是我的修改过的cfg文件，可以编译通过

• 4、固件烧录

https://xr806.docs.aw-ol.com/study/soft_flash/
根据教程烧录即可，使用波特率921600可以烧录更快

windows下如果烧录时报错，可以跟我这样设置

• 5、使用串口进行调试，波特率设置115200，这里使用的是windows下的SSCOM
  

调试时如果不出现消息可以点击，打开串口->重新插拔数据线->按下复位键（XR806右下角）

• 6、这里使用ubuntu下的mosquito作为服务端

ubuntu安装mosquitto可以参考这个链接
https://www.cnblogs.com/guyk/p/12405938.html

开启mosquito服务
mosquitto -c /etc/mosquitto/mosquitto.conf -d

如果显示1883端口已占用，可以强制结束mosquito后台然后重启服务，这里我使用1884端口

开启服务后板子就可以连接虚拟机进行操作了，可以在mosquito下进行订阅发布信息
如果想要在windows环境下进行订阅发布，可以下载MQTT.fx工具

http://mqttfx.jensd.de/index.php/download

• 7、mqtt代码烧录
  XR806文件夹里面，是有很多例程的，这里的代码参考自/device/xradio/xr806/xr_shylark/project/example/mqtt/main.c

#include <stdio.h>
#include "ohos_init.h"
#include "kernel/os/os.h"
#include <string.h>
#include "wifi_device.h"
#include "wifi_hotspot.h"
#include "common/framework/platform_init.h"
#include "net/wlan/wlan.h"
#include "common/framework/net_ctrl.h"
#include "net/mqtt/MQTTClient-C/MQTTClient.h"
#define WIFI_DEVICE_CONNECT_AP_SSID "Redmi"
#define WIFI_DEVICE_CONNECT_AP_PSK "00000000"
#define MQTT_DEMO_THREAD_STACK_SIZE (8 * 1024) /* ssl need more stack */
static OS_Thread_t mqtt_demo_thread;
static OS_Thread_t g_main_thread;
static MQTTPacket_connectData mqtt_demo_connectData = MQTTPacket_connectData_initializer;
static Client mqtt_demo_client;
static Network mqtt_demo_network;

#define MQTT_DEMO_CLIENT_ID "mqt"
#define MQTT_DEMO_HOST_NAME "192.168.43.251"
#define MQTT_DEMO_PORT      "1884"
#define MQTT_DEMO_USERNAME  "root"
#define MQTT_DEMO_PASSWORD  ""
#define MQTT_DEMO_TOPIC     "/vo84Hm3xbUj/xr806_senor_set0/data"

#define MQTT_DEMO_BUF_SIZE (2*1024)
#define WIFI_START 1
#define MQTT_DEMO_MSG_TEXT "mqtt demo test"

void wifi_scan_connect(){
	if(WIFI_SUCCESS != EnableWifi()){
		printf("Error:wifi enable fail!\n");
		return;
	}
	if(WIFI_SUCCESS != Scan()){
		printf("Error:wifi scan fail!\n");
	}
	printf("WIFI SCAN STARTED!\n");
	OS_Sleep(3);

	WifiScanInfo scan_result[30];
	unsigned int scan_num = 30;

	if(WIFI_SUCCESS != GetScanInfoList(scan_result, &scan_num)){
		printf("Error: get scan result fail!\n");
		return;
	}
	printf("Scan successful,you've got:\n");
	for(int i = 0;i < scan_num;i++){
		printf("SSID: %s ",scan_result[i].ssid);
		printf("RSSI: %d",scan_result[i].rssi);
	}
	printf("Scan End \n");
	const char ssid_want_connect[] = WIFI_DEVICE_CONNECT_AP_SSID;
	const char psk[] = WIFI_DEVICE_CONNECT_AP_PSK;
	printf("Connecting...");
	if(WIFI_STA_ACTIVE == IsWifiActive()){
		printf("Wifi is active.\n");
	}
	OS_Sleep(1);
	WifiDeviceConfig config = {0};
	int netId = 0;
	int i;
	for(i = 0;i < scan_num;i++){
		if(0 == strcmp(scan_result[i].ssid, ssid_want_connect)){
			memcpy(config.ssid, scan_result[i].ssid, WIFI_MAX_SSID_LEN);
			memcpy(config.bssid, scan_result[i].bssid, WIFI_MAC_LEN);
			strcpy(config.preSharedKey, psk);
			config.securityType = scan_result[i].securityType;
			config.wapiPskType = WIFI_PSK_TYPE_ASCII;
			config.freq = scan_result[i].frequency;
			break;
		}
	}
	if(i >= scan_num){
		printf("Error: No SSID SET FOUND!\n");
		return;
	}
	printf("Found Correct SSID in Scan List!\n");
	if(WIFI_SUCCESS != AddDeviceConfig(&config, &netId)){
		printf("Error: Add Device config failed!\n");
		return;
	}
	printf("Add Device Config successful!\n");
	if(WIFI_SUCCESS != ConnectTo(netId)){
		printf("Error: Connect to Wifi FAILED!\n");
		return;
	}
	printf("Connect to %s successful!\n",config.ssid);
	OS_Sleep(3);
}
static int mqtt_demo_init(void)
{
	char *send_buf;
	char *recv_buf;

	/* init client id */
	mqtt_demo_connectData.clientID.cstring = MQTT_DEMO_CLIENT_ID;
	/* init keep alive interval */
	mqtt_demo_connectData.keepAliveInterval = 30; // 30s
	/* enable session reuse */
	mqtt_demo_connectData.cleansession = 0;
	/* set mqtt version */
	mqtt_demo_connectData.MQTTVersion = 4; //Version of MQTT 3.1.1

	/* send/recv buffer must free when mqtt deinit */
	send_buf = malloc(MQTT_DEMO_BUF_SIZE);
	if (send_buf == NULL) {
		printf("no memory\n");
		return -1;
	}
	recv_buf = malloc(MQTT_DEMO_BUF_SIZE);
	if (recv_buf == NULL) {
		free(send_buf);
		printf("no memory\n");
		return -1;
	}

	/* init network */
	NewNetwork(&mqtt_demo_network);
	/* init mqtt client object */
	MQTTClient(&mqtt_demo_client, &mqtt_demo_network, 6000,
	           (unsigned char *)send_buf, MQTT_DEMO_BUF_SIZE,
	           (unsigned char *)recv_buf, MQTT_DEMO_BUF_SIZE);

	/**
	 * set will function, when this client disconnect,
	 * server will sent the message to every client in MQTT_DEMO_TOPIC
	 */
	mqtt_demo_connectData.willFlag = 1;
	mqtt_demo_connectData.will.topicName.cstring = MQTT_DEMO_TOPIC;
	mqtt_demo_connectData.will.message.cstring = "I am disconnected";
	mqtt_demo_connectData.will.retained = 0;
	mqtt_demo_connectData.will.qos = 0;

	/* set username and password */
	mqtt_demo_connectData.username.cstring = MQTT_DEMO_USERNAME;
	mqtt_demo_connectData.password.cstring = MQTT_DEMO_PASSWORD;

	return 0;
}

static int mqtt_demo_connect(char *host_name, char *host_port)
{
	int ret = -1;

	/* need connect the server in tcp level first, if use ssl, use TLSConnectNetwork() */
	ret = ConnectNetwork(&mqtt_demo_network, host_name, atoi(host_port));
	if (ret != 0) {
		printf("mqtt connect faild, ret:%d, host:%s, port:%s\n", ret, host_name, host_port);
		goto exit;
	}

	/* if tcp level connected, then connect mqtt level */
	ret = MQTTConnect(&mqtt_demo_client, &mqtt_demo_connectData);
	if (ret != 0) {
		printf("mqtt connect faild, ret:%d\n", ret);
		/* disconnect the tcp level */
		mqtt_demo_network.disconnect(&mqtt_demo_network);
		goto exit;
	}
	printf("mqtt connected\n");

exit:
	return ret;
}

static void mqtt_demo_msg_cb(MessageData *data)
{
	printf("get a message, topic: %.*s, msg: %.*s\n", data->topicName->lenstring.len,
	       data->topicName->lenstring.data, data->message->payloadlen,
	       (char *)data->message->payload);
}

static int mqtt_demo_subscribe(char *topic)
{
	int ret = -1;

	if (mqtt_demo_client.isconnected) {
		/* set the message callback */
		ret = MQTTSubscribe(&mqtt_demo_client, topic, 0, mqtt_demo_msg_cb);
		if (ret != 0)
			printf("mqtt subscribe faild ret:%d\n", ret);
	}
	return ret;
}

static int mqtt_demo_unsubscribe(char *topic)
{
	int ret = -1;

	if (mqtt_demo_client.isconnected) {
		ret = MQTTUnsubscribe(&mqtt_demo_client, topic);
		if (ret != 0)
			printf("mqtt unsubscribe faild, ret:%d\n", ret);
	}
	return ret;
}

static int mqtt_demo_publish(char *topic, char *msg)
{
	int ret = -1;

	MQTTMessage message;

	memset(&message, 0, sizeof(message));
	message.qos = 0;
	message.retained = 0; /* disable retain the message in server */
	message.payload = msg;
	message.payloadlen = strlen(msg);

	ret = MQTTPublish(&mqtt_demo_client, topic, &message);
	if (ret != 0)
		printf("mqtt publish faild, ret:%d\n", ret);

	return ret;
}

static int mqtt_demo_disconnect(void)
{
	int ret = -1;

	if (mqtt_demo_client.isconnected) {
		/* need disconnect mqtt level first */
		ret = MQTTDisconnect(&mqtt_demo_client);
		if (ret != 0)
			printf("mqtt disconnect fail, ret:%d\n", ret);
		/* then disconnect tcp level */
		mqtt_demo_network.disconnect(&mqtt_demo_network);
	}

	return ret;
}

static void mqtt_demo_deinit(void)
{
	if (mqtt_demo_client.buf) {
		free(mqtt_demo_client.buf);
		mqtt_demo_client.buf = NULL;
	}
	if (mqtt_demo_client.readbuf) {
		free(mqtt_demo_client.readbuf);
		mqtt_demo_client.readbuf = NULL;
	}
}

static void mqtt_demo_fun(void *arg)
{
	int ret;
	int reconnect_times = 0;

	/* mqtt init */
	mqtt_demo_init();

	/* mqtt connect */
re:
	ret = mqtt_demo_connect(MQTT_DEMO_HOST_NAME, MQTT_DEMO_PORT);
	if (ret != 0)
		OS_MSleep(500);
		goto re;

	/* subscribe topic */
	ret = mqtt_demo_subscribe(MQTT_DEMO_TOPIC);
	if (ret != 0)
		goto exit;

	while (1) {
		/* publish message to topic */
		mqtt_demo_publish(MQTT_DEMO_TOPIC, MQTT_DEMO_MSG_TEXT);
		ret = MQTTYield(&mqtt_demo_client, 300);
		if (ret != 0) {
			printf("mqtt yield err, ret:%d\n", ret);
reconnect:
			printf("mqtt reconnect\n");
			mqtt_demo_disconnect();
			ret = mqtt_demo_connect(MQTT_DEMO_HOST_NAME, MQTT_DEMO_PORT);
			if (ret != 0) {
				reconnect_times++;
				if (reconnect_times > 5)
					goto exit;
				OS_MSleep(5000); //5s
				goto reconnect;
			}
		}
		OS_MSleep(1000); //1s
	}

exit:
	mqtt_demo_unsubscribe(MQTT_DEMO_TOPIC);
	mqtt_demo_disconnect();
	mqtt_demo_deinit();

	OS_ThreadDelete(&mqtt_demo_thread);
}

static void MainThread(void *arg){
#if WIFI_START == 1
	wifi_scan_connect();
#endif
}

int main(void)
{
	if(OS_ThreadCreate(&g_main_thread, "MainThread", MainThread, NULL, OS_THREAD_PRIO_APP, 4 * 1024) != OS_OK){
		printf("[ERR] Create MainThread Failed\n");
	}
	if (OS_ThreadCreate(&mqtt_demo_thread, "mqtt_demo_thread", mqtt_demo_fun, NULL,
			                OS_THREAD_PRIO_APP,
			                4 * 1024) != OS_OK) {
		printf("[ERR] Create MainThread Failed\n");
	}
	
}
SYS_RUN(main);

#define WIFI_DEVICE_CONNECT_AP_SSID "Redmi"
#define WIFI_DEVICE_CONNECT_AP_PSK "00000000"

• 在这里可以设置XR806连接的wifi SSID和密码

#define MQTT_DEMO_CLIENT_ID "mqt"
#define MQTT_DEMO_HOST_NAME "192.168.43.251"
#define MQTT_DEMO_PORT      "1884"
#define MQTT_DEMO_USERNAME  "root"
#define MQTT_DEMO_PASSWORD  ""
#define MQTT_DEMO_TOPIC     "/vo84Hm3xbUj/xr806_senor_set0/data"

• 这里的HOST_NAME根据你的虚拟机ip进行修改，查看虚拟机ip可以使用ifconfig -a进行查看，另外我的虚拟机网络选择的是直接复制物理网络连接状态

• MQTT_DEMO_TOPIC为你订阅的主题，可以随便设置，订阅的时候代码做出相应修改即可

• MQTT_DEMO_USERNAME是刚才在mosquito配置的账号root

wifi_scan_connect()

• 这个函数是连接wifi，连接wifi后mqtt就可以连接上虚拟机的服务端

int main(void)
{
	if(OS_ThreadCreate(&g_main_thread, "MainThread", MainThread, NULL, OS_THREAD_PRIO_APP, 4 * 1024) != OS_OK){
		printf("[ERR] Create MainThread Failed\n");
	}
	if (OS_ThreadCreate(&mqtt_demo_thread, "mqtt_demo_thread", mqtt_demo_fun, NULL,
			                OS_THREAD_PRIO_APP,
			                4 * 1024) != OS_OK) {
		printf("[ERR] Create MainThread Failed\n");
	}
	
}

• 这个是main函数，创建两个线程，一个连接wifi一个，连接mqtt

要注意的是使用SYS_RUN的时候要包含这个头文件，否则编译出错

#include "ohos_init.h"

• 可以看到只有一个mqtt文件夹和main.c文件，非常简单

• 这个是ohosdemo目录下的BUILD.gn

• 这个是mqtt目录下的BUILD.gn
  包含wifi头文件和mqtt头文件即可

• 8、编译文件

执行hb build -f//首次编译加-f，之后不用

执行 
 sudo cp ~/xr806_openharmony/device/xradio/xr806/xr_skylark/out/xr_system.img /home/用户名/

将编译后的xr_system.img复制到用户目录

最后进行烧录即可运行mqtt，我使用的是安卓手机开wifi给电脑和XR806连接，虚拟机复制物理网络同时运行mosquito，mqtt连接上mosquito即可进行订阅和发布

使用mosquitto订阅XR806的消息
mosquitto_sub -h 192.168.43.251 -p 1884 "你设置的主题名字" -u "root"

使用mosquitto给XR806发布消息
mosquitto_pub -h 192.168.43.251 -p 1884 "你设置的主题名字" -m "想要给XR806发的消息" -u "root"

• 要注意的是-p选项填你在mosquito.conf文件设置的端口，-h选项填你的服务端ip地址，在这里是我的ubuntu的ip地址

成功进行mqtt连接后就可以进行wifi和mqtt的学习了