上成果
阿里云对接需要用的是PRODUCTKEY，DEVICENAME和DEVICESECRET，开始直接用MQTT的例子硬怼，没成功，后面看了文档，发现阿里云对接的client_id,username和password是通过三要素生成的。
找了一下代码，发现再device/xradio/xr806/xr_skylark/src/net/cloud/aliyun下面有阿里云的东西，遂打开看了一下，刚好有加密过程。就直接拿过来用了，不过这里出现了一点小插曲，一直引用不到里面的接口。折腾了半天不行，一怒之下，给复制出来了。
代码
创建app站内有很多文章就不再赘述，创建好以后代码结构如下：
其中，inc是把device/xradio/xr806/xr_skylark/include/net/cloud/aliyun下面的inc复制出来的；
src下面的aliyun，是直接把
device/xradio/xr806/xr_skylark/src/net/cloud/aliyun
复制出来的；
wifi，mqtt，uart的都有例子，就拿过来，改一改。大体流程是
先初始化wifi，连接wifi成功获取到网络权限以后，初始化mqtt的task，待mqtt的task连接到阿里云iot以后，初始化uart task，初始化OK以后开始轮询接收uart1数据，并透传给阿里云。
不BB了，直接上代码：
ohosdemo下的BUILD.gn
group("ohosdemo") {
deps = [
#"hello_demo:app_hello",
"mqtt2uart_demo:app_uart2mqtt",
]
}
mqtt2uart_demo下的BUILD.gn
import("//device/xradio/xr806/liteos_m/config.gni")
static_library("app_uart2mqtt") {
configs = []
sources = [
"src/main.c",
"src/aliyun/alink_auth.c",
"src/aliyun/alink_ca.c",
"src/aliyun/alink_cjson_get.c",
"src/aliyun/alink_mqtt_client.c",
"src/aliyun/alink_utils.c",
]
cflags = board_cflags
include_dirs = board_include_dirs
include_dirs += [
"inc",
"//kernel/liteos_m/kernel/arch/include",
"//base/iot_hardware/peripheral/interfaces/kits",
".",
"//utils/native/lite/include",
"//foundation/communication/wifi_lite/interfaces/wifiservice",
"//device/xradio/xr806/xr_skylark/project"
]
}
main.c
#include <string.h>
#include "ohos_init.h"
#include "kernel/os/os.h"
#include "iot_gpio.h"
#include "wifi_device.h"
#include "common/framework/net_ctrl.h"
#include "mqtt_client.h"
#include "driver/chip/hal_uart.h"
#include "iot_uart.h"
static OS_Thread_t g_main_thread;
static OS_Thread_t g_mqtt_thread;
static OS_Thread_t g_uart_thread;
#define WIFI_DEVICE_CONNECT_AP_SSID "XXXXX"//这里填你家路由器的SSID
#define WIFI_DEVICE_CONNECT_AP_PSK "XXXXX"//这里填你家路由器的PWD
#define MQTT_CLIENT_ID "2022666"
#define MQTT_HOST_NAME "iot-as-mqtt.cn-shanghai.aliyuncs.com"
#define MQTT_PORT "1883"
#define MQTT_PRODUCTKEY "a1oz5VdCSZk"
#define MQTT_DEVICENAME "DHTER000S"
#define MQTT_DEVICESECRET "8368b89e723216bccb471434969391e5"
#define MQTT_SECUREMODE "2"
#define MQTT_RECV_TOPIC MQTT_PRODUCTKEY"/"MQTT_DEVICENAME"/user/get" //下发TOPIC
#define MQTT_UPDATE_TOPIC MQTT_PRODUCTKEY"/"MQTT_DEVICENAME"/user/update"//上报TOPIC
#define MQTT_BUF_SIZE (2*1024)
static MQTTPacket_connectData mqtt_demo_connectData = MQTTPacket_connectData_initializer;
static Client mqtt_demo_client;
static Network mqtt_demo_network;
#define UART_BUFFER_MAXSIZE 100
static int mqtt_demo_publish(char *topic, char *msg) ;
static int mqtt_demo_init(void) {
char *send_buf;
char *recv_buf;
mqtt_para_init();
aliot_device_info(MQTT_PRODUCTKEY,
MQTT_DEVICENAME,
MQTT_DEVICESECRET,
MQTT_CLIENT_ID,
MQTT_SECUREMODE);
printf("str_clientID = %s\n", xr_devc_info.client_id);
printf("str_user_name = %s\n", xr_devc_info.user_name);
printf("sha1_pwd = %s\n", xr_devc_info.password);
mqtt_demo_connectData.clientID.cstring = xr_devc_info.client_id;
mqtt_demo_connectData.keepAliveInterval = 30; // 30s
mqtt_demo_connectData.cleansession = 0;
mqtt_demo_connectData.MQTTVersion = 4; //Version of MQTT 3.1.1
send_buf = malloc(MQTT_BUF_SIZE);
if (send_buf == NULL) {
printf("no memory\n");
return -1;
}
recv_buf = malloc(MQTT_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_BUF_SIZE,
(unsigned char *)recv_buf, MQTT_BUF_SIZE);
/* set username and password */
mqtt_demo_connectData.username.cstring = xr_devc_info.user_name;
mqtt_demo_connectData.password.cstring = xr_devc_info.password;
return 0;
}
static int mqtt_demo_connect(char *host_name, char *host_port) {
int ret = -1;
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;
}
ret = MQTTConnect(&mqtt_demo_client, &mqtt_demo_connectData);
if (ret != 0) {
printf("mqtt connect faild, ret:%d\n", ret);
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) {
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) {
ret = MQTTDisconnect(&mqtt_demo_client);
if (ret != 0)
printf("mqtt disconnect fail, ret:%d\n", ret);
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 uart_task(void *arg)
{
int ret;
unsigned int uart_id = 1;
unsigned int uart_len;
unsigned char uart_rx_buffer[UART_BUFFER_MAXSIZE];
unsigned char uart_tx_buffer[UART_BUFFER_MAXSIZE];
static IotUartAttribute uart_param = { 115200,
IOT_UART_DATA_BIT_8,
IOT_UART_STOP_BIT_1,
IOT_UART_PARITY_NONE,
0,
0,
0 };
printf("uart%d test start\r\n", uart_id);
IoTUartInit(uart_id, &uart_param);
IoTUartWrite(uart_id, "uart1 init OK\r\n", 15);
while (1) {
memset((char *)uart_rx_buffer, 0, UART_BUFFER_MAXSIZE);
ret = IoTUartRead(uart_id, uart_rx_buffer, UART_BUFFER_MAXSIZE);
if (ret > 0) {
printf("recv len=%d, data:%s\r\n", ret, uart_rx_buffer);
if(0 == mqtt_demo_publish(MQTT_UPDATE_TOPIC, uart_rx_buffer))
{
memset(uart_tx_buffer, 0, UART_BUFFER_MAXSIZE);
uart_len = snprintf((char *)uart_tx_buffer,
UART_BUFFER_MAXSIZE,
"uart%d send data:[%s] OK\r\n",
uart_id,
uart_rx_buffer);
IoTUartWrite(uart_id, uart_tx_buffer, uart_len);
}
else
{
printf("Publish data failed!!\n");
}
}
OS_MSleep(100); //100ms
}
exit:
IoTUartDeinit(uart_id);
OS_ThreadDelete(&g_uart_thread);
printf("uart%d test end\r\n", uart_id);
}
static void mqtt_task(void *arg) {
int ret;
int reconnect_times = 0;
mqtt_demo_init();
ret = mqtt_demo_connect(MQTT_HOST_NAME, MQTT_PORT);
if (ret != 0)
goto exit;
ret = mqtt_demo_subscribe(MQTT_RECV_TOPIC);
if (ret != 0)
goto exit;
mqtt_demo_publish(MQTT_UPDATE_TOPIC, "mqtt init OK");
if (!OS_ThreadIsValid(&g_uart_thread)) {
OS_ThreadCreate(&g_uart_thread, "uart_task",
uart_task, (void *)NULL, OS_THREAD_PRIO_APP, (8 * 1024));
}
while (1) {
ret = MQTTYield(&mqtt_demo_client, 500);
if (ret != 0) {
printf("mqtt yield err, ret:%d\n", ret);
reconnect:
printf("mqtt reconnect\n");
mqtt_demo_disconnect();
ret = mqtt_demo_connect(MQTT_HOST_NAME, MQTT_PORT);
if (ret != 0) {
reconnect_times++;
if (reconnect_times > 5)
goto exit;
OS_MSleep(5000); //5s
goto reconnect;
}
}
}
exit:
printf("mqtt disconnect\n");
mqtt_demo_unsubscribe(MQTT_RECV_TOPIC);
mqtt_demo_disconnect();
mqtt_demo_deinit();
OS_ThreadDelete(&g_mqtt_thread);
}
static void net_cb(uint32_t event, uint32_t data, void *arg) {
uint16_t type = EVENT_SUBTYPE(event);
switch (type) {
case NET_CTRL_MSG_NETWORK_UP:
printf("NET_CTRL_MSG_NETWORK_UP\n");
if (!OS_ThreadIsValid(&g_mqtt_thread)) {
OS_ThreadCreate(&g_mqtt_thread, "connect_to_server_task",
mqtt_task, (void *)NULL, OS_THREAD_PRIO_APP, (8 * 1024));
}
break;
case NET_CTRL_MSG_NETWORK_DOWN:
break;
default:
break;
}
}
static void MainThread(void *arg) {
printf("MainThread start\r\n");
if (WIFI_SUCCESS != EnableWifi()) {
printf("Error: EnableWifi fail\n");
return;
}
OS_Sleep(1);
if (WIFI_SUCCESS != Scan()) {
printf("Error: Scan fail.\n");
return;
}
OS_Sleep(3);//这里为了方便用延时，实际用回调更好，否则3秒可能不够
const char ssid_want_connect[] = WIFI_DEVICE_CONNECT_AP_SSID;
const char psk[] = WIFI_DEVICE_CONNECT_AP_PSK;
WifiScanInfo scan_results[30];
unsigned int scan_num = 30;
if (WIFI_SUCCESS != GetScanInfoList(scan_results, &scan_num)) {
printf("Error: GetScanInfoList fail.\n");
return;
}
WifiDeviceConfig config = { 0 };
int netId = 0;
int i;
for (i = 0; i < scan_num; i++) {
printf("ssid: %s ", scan_results[i].ssid);
printf("securityType: %d\n", scan_results[i].securityType);
if (0 == strcmp(scan_results[i].ssid, ssid_want_connect)) {
memcpy(config.ssid, scan_results[i].ssid,
WIFI_MAX_SSID_LEN);
memcpy(config.bssid, scan_results[i].bssid,
WIFI_MAC_LEN);
strcpy(config.preSharedKey, psk);
config.securityType = scan_results[i].securityType;
config.wapiPskType = WIFI_PSK_TYPE_ASCII;
config.freq = scan_results[i].frequency;
break;
}
}
if (i >= scan_num) {
printf("Error: No found ssid in scan_results\n");
return;
}
if (WIFI_SUCCESS != AddDeviceConfig(&config, &netId)) {
printf("Error: AddDeviceConfig Fail\n");
return;
}
printf("Config Success\n");
if (WIFI_SUCCESS != ConnectTo(netId)) {
printf("Error: ConnectTo Fail\n");
return;
}
observer_base *net_ob;
net_ob = sys_callback_observer_create(CTRL_MSG_TYPE_NETWORK, NET_CTRL_MSG_ALL, net_cb, NULL);
if (net_ob == NULL)
return;
if (sys_ctrl_attach(net_ob) != 0)
return;
while (1) {
OS_MSleep(500);
}
}
void UART2MQTTMain(void) {
if (OS_ThreadCreate(&g_main_thread, "MainThread", MainThread, NULL, OS_THREAD_PRIO_APP, 4 * 1024) != OS_OK) {
printf("[ERR] Create MainThread Failed\n");
}
}
SYS_RUN(UART2MQTTMain);
遇到的问题
1.aliyun的lib引用不到
偷懒，直接复制出来的；
2.mqtt yield err, ret:-1
抓包发现，有时候发的keepalive包没有得到响应，怀疑是本地网络不好，后来连上家里的wifi就没问题了。
做了一个简单的修改，发包一次不响应过会再发一次。三次收不到才认为是短线，才发起reconnect。
文件：MQTTClient.c
函数：int keepalive(Client* c)
修改如下：
if (expired(&c->last_sent) || expired(&c->last_received))
{
if (c->ping_outstanding)
{
MQTT_WARN("PINGRESP not received in keepalive interval %d.\n",c->ping_outstanding);
if(c->ping_outstanding <= 3){
Timer timer;
InitTimer(&timer);
countdown_ms(&timer, 1000);
int len = MQTTSerialize_pingreq(c->buf, c->buf_size);
if (len > 0 && (rc = sendPacket(c, len, &timer)) == SUCCESS) // send the ping packet
c->ping_outstanding++;
}
else
{
rc = FAILURE; /* PINGRESP not received in keepalive interval */
}
}
else
{
Timer timer;
InitTimer(&timer);
countdown_ms(&timer, 1000);
int len = MQTTSerialize_pingreq(c->buf, c->buf_size);
if (len > 0 && (rc = sendPacket(c, len, &timer)) == SUCCESS) // send the ping packet
c->ping_outstanding = 1;
}
}
待优化
- 串口透传部分目前是接过来数据就上传，没有加缓冲，数据量大时候，可能会丢数据可以加一下队列；
- aliyun部分代码引用最好不要复制，引用原位置代码最好；
![[C++核心编程]（二）：引用](https://img-blog.csdnimg.cn/direct/3460142634874e2d987056b9d2431f52.png)
