【平头哥RVB2601开发板试用体验】AT解析器和通过w800 AT命令接入阿里云生活物联网平台-阿里云开发者社区

作者：niu

在RVB2601开发板上，CH2601主芯片通过SPI接口和W800 WIFi/BLE模块通信，W800芯片在此接口上提供AT命令的方式供主芯片使用W800的功能。

根据《W800模组AT指令集》中的描述，W800芯片中实现了WiFi配网、WiFi连接、TCP连接、阿里云飞燕生活物联网平台接入等功能。W800模组AT指令集.pdf (aliyuncs.com)

从RVB2601的SDK看，已经实现了基于W800 AT命令的Socket抽象设备，本文中将尝试在现有功能基础上，实现和测试验证阿里云平台接入的等相关功能，同时去了解YoC中网络设备和AT解析器框架。 AT指令解析器 AT指令解析器主要用于发送命令、等待响应，用户可通过atparser_response_recv()获取并解析该应答数据，对于对端主动发送的数据（数据即为带外数据），则传入对应的带外处理函数中。 AT指令解析器 · GitBook (t-head.cn)

接口详细说明

初始化一个AT指令解析器

atparser_uservice_t *atparser_init(utask_t *task, const char *name, uart_config_t *config)

根据指定的微服务任务,串口名以及串口配置信息创建一个AT 指令解析器，成功则返回atparser_uservice_t指针，失败返回NULL

参数:

task：微服务任务
name: 串口名
config: 串口配置信息

返回值:

成功则返回atparser_uservice_t指针，失败返回NULL

初始化一个用户自定义的AT指令解析器

atparser_uservice_t *atparser_channel_init(utask_t *task, const char *name, void *config, at_channel_t *channel);

根据指定的微服务任务,串口名以及串口配置信息创建一个AT 指令解析器，成功则返回atparser_uservice_t指针，失败返回NULL

参数:

task：微服务任务
name: 设备名
config: 设备配置信息
channel：at指令解析器的channel

返回值:

成功则返回atparser_uservice_t指针，失败返回NUL

at_channel是具体执行AT命令内容收发的通道，比如串口、SPI接口等，RVB2601开发板上使用SPI接口；atparse负责对命令内容的解析和格式化拼装。

带外数据处理函数的格式

typedef int (*oob_callback)(atparser_uservice_t *at, void *pive, oob_data_t *oob_data);

用户根据传入的数据，做相关的处理，若处理完成则返回0；若处理未完成则返回-1

参数:

at: AT 指令解析器
pive：用户自定义数据
oob_data: 带外数据结构体

返回值:

0表示处理完成并退出本次OOB,-1表示处理未完成,需要继续执行OOB

创建一个带外数据服务

int atparser_oob_create(atparser_uservice_t *at, const char *prefix, oob_callback cb, void *context);

根据指定的AT 指令解析器，带外数据匹配字符串，带外数据处理函数，以及用户自定义的上下文创建一个带外数据处理服务，成功则返回0，失败则返回负值

代码实现

cli中注册一个命令去触发连接云等动作，在获取到IP后去给w800发AT命令，开始连接云。

//应用层，添加cli命令
extern int set_aliyun_key( );
extern int set_aliyun_smartconf( );
extern int cloud_connect();
static void do_yun_cmd(char *wbuf, int wbuf_len, int argc, char **argv)
{
    if (argc > 1) {
        if (0 == strcmp(argv[1], "config")) {
            printf("do smart confg\r\n");
            set_aliyun_smartconf( );
            return;
        } else if (0 == strcmp(argv[1], "conn")) {
            printf("do cloud_connect\r\n");
            cloud_connect();
            return;
        } else if (0 == strcmp(argv[1], "set")) {
            printf("do set_aliyun_key\r\n");
            set_aliyun_key( );
            return;
        }
    }
}
void cli_reg_cmd_user(void)
{
    static const struct cli_command cmd_yun = {
        "yun",
        "yun comand",
        do_yun_cmd,
    };
    aos_cli_register_command(&cmd_yun);
}

W800的AT解析器实现中增加对云连接状态和属性设置下发的处理

extern at_channel_t spi_channel;
int w800_module_init(utask_t *task, w800_wifi_param_t *param)
{
    if (w800_module_inited) {
        return 0;
    }
    if (task == NULL) {
        task = utask_new("w800", 7 * 1024, QUEUE_MSG_COUNT, AOS_DEFAULT_APP_PRI + 4);
    }
    if (task == NULL) {
        return -1;
    }
    if (param->reset_pin) {
        csi_gpio_pin_init(&g_reset_pin, param->reset_pin);
        csi_gpio_pin_mode(&g_reset_pin,GPIO_MODE_PULLUP);
        csi_gpio_pin_dir(&g_reset_pin,GPIO_DIRECTION_OUTPUT);
        csi_gpio_pin_write(&g_reset_pin, GPIO_PIN_LOW);
        aos_msleep(200);
        csi_gpio_pin_write(&g_reset_pin, GPIO_PIN_HIGH);
        aos_msleep(1000);
        LOGD(TAG, "hard reset");
    }
    g_atparser_uservice_t = atparser_channel_init(task, NULL, param, &spi_channel);
    aos_mutex_new(&g_cmd_mutex);
    atparser_debug_control(g_atparser_uservice_t, 1);
    atparser_oob_create(g_atparser_uservice_t, "2,CLOSED", _closed2_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "1,CLOSED", _closed1_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "0,CLOSED", _closed0_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "+EVENT=NET,LINK_UP", _gotip_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "+EVENT=NET,LINK_DOWN", _disconnect_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "+EVENT=RECV,", _recv_data_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "+EVENT=DISCONNECT,0", _closed0_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "+EVENT=DISCONNECT,1", _closed1_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "+EVENT=DISCONNECT,2", _closed2_handler, NULL);
    atparser_oob_create(g_atparser_uservice_t, "+IDMSTA:", cloud_connsta_handler, NULL);   //连接状态OOB注册
    atparser_oob_create(g_atparser_uservice_t, "+IDMPS:", cloud_recv_handler, NULL);       //属性设置OOB注册
    w800_module_inited = 1;
    return 0;
}
/* 接收到云端下发的属性设置 */
/* oob_data->buf和oob_data->len为AT通道上接收到的"+IDMPS:"之后的内容和长度 */
static int cloud_recv_handler(atparser_uservice_t *at, void *priv, oob_data_t *oob_data)
{
    //+IDMPS:<device_id>,<msg_len>,<message>  OK
    int id = 0;
    int len = 0;
    char data[128] = {0};
    LOGI(TAG,"%s(%d)",oob_data->buf,oob_data->len);
     char *str = strchr(oob_data->buf, ':');
        if (str  != NULL) {
            sscanf(oob_data->buf, "%d,%d,%s\r\n", &id, &len, data);
            LOGI(TAG,"==>cloud_recv %d(%d):%s\r\n",id, len, data);
            oob_data->used_len += (str - oob_data->buf+1);
        }
    /* recv data is not enough need recv more */
    return 0;
}
/*云连接状态上报OOB处理*/
static int cloud_connsta_handler(atparser_uservice_t *at, void *priv, oob_data_t *oob_data)
{
    LOGI(TAG,"==>cloud_conn: %s(%d)",oob_data->buf,oob_data->len);
    /* recv data is not enough need recv more */
    return 0;
}

实现云连接等功能的AT命令收发

int cloud_connect()
{
    int ret = -1;
    g_net_status = NET_STATUS_READY;
    aos_mutex_lock(&g_cmd_mutex, AOS_WAIT_FOREVER);
    atparser_set_timeout(g_atparser_uservice_t, 30 * 1000);
    atparser_clr_buf(g_atparser_uservice_t);
    if (atparser_send(g_atparser_uservice_t, "AT+IDMCON") == 0) {
        if (atparser_recv(g_atparser_uservice_t, "OK") == 0) {
            ret = 0;
            LOGI(TAG,"===>IDMCON OK");
        }
    }
    atparser_set_timeout(g_atparser_uservice_t, 8 * 1000);
    atparser_cmd_exit(g_atparser_uservice_t);
    aos_mutex_unlock(&g_cmd_mutex);
    return ret;
}
int set_aliyun_key( )
{
     int ret = -1;
    g_net_status = NET_STATUS_READY;
    aos_mutex_lock(&g_cmd_mutex, AOS_WAIT_FOREVER);
    atparser_set_timeout(g_atparser_uservice_t, 30 * 1000);
    atparser_clr_buf(g_atparser_uservice_t);
    if (atparser_send(g_atparser_uservice_t, "AT+IDMAU=\"%s\",\"%s\",\"%s\",\"%s\"", PRODUCT_KEY, DEVICE_NAME, DEVICE_SECRET, PRODUCT_SECRET) == 0) {
        if (atparser_recv(g_atparser_uservice_t, "OK") == 0) {
            ret = 0;
            LOGI(TAG,"===>IDMAU OK");
        }
    }
    atparser_set_timeout(g_atparser_uservice_t, 30 * 1000);
    atparser_clr_buf(g_atparser_uservice_t);
    if (atparser_send(g_atparser_uservice_t, "AT+IDMPID=%ld", PRODUCT_ID) == 0) {
        if (atparser_recv(g_atparser_uservice_t, "OK") == 0) {
            ret = 0;
            LOGI(TAG,"===>IDMPID OK");
        }
    }
    atparser_set_timeout(g_atparser_uservice_t, 8 * 1000);
    atparser_cmd_exit(g_atparser_uservice_t);
    aos_mutex_unlock(&g_cmd_mutex);
    return ret;
}
int set_aliyun_smartconf( )
{
    int ret = -1;
    g_net_status = NET_STATUS_READY;
    aos_mutex_lock(&g_cmd_mutex, AOS_WAIT_FOREVER);
    atparser_set_timeout(g_atparser_uservice_t, 30 * 1000);
    atparser_clr_buf(g_atparser_uservice_t);
    if (atparser_send(g_atparser_uservice_t, "AT+IDMCLS") == 0) {
        if (atparser_recv(g_atparser_uservice_t, "OK") == 0) {
            ret = 0;
            LOGI(TAG,"===>IDMCLS OK");
        }
    }
    atparser_set_timeout(g_atparser_uservice_t, 30 * 1000);
    atparser_clr_buf(g_atparser_uservice_t);
    if (atparser_send(g_atparser_uservice_t, "AT+IWSSTART=0") == 0) {
        if (atparser_recv(g_atparser_uservice_t, "OK") == 0) {
            ret = 0;
            LOGI(TAG,"===>IWSSTART OK");
        }
    }
    atparser_set_timeout(g_atparser_uservice_t, 8 * 1000);
    atparser_cmd_exit(g_atparser_uservice_t);
    aos_mutex_unlock(&g_cmd_mutex);
    return ret;
}