at_device/class/n720/at_device_n720.c

/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2020-10-27     qiyongzhong  first version
 */

#include <stdio.h>
#include <string.h>

#include <at_device_n720.h>

#define LOG_TAG                         "at.dev.n720"
#include <at_log.h>

#ifdef AT_DEVICE_USING_N720

#define N720_WAIT_CONNECT_TIME          15000
#define N720_THREAD_STACK_SIZE          2048
#define N720_THREAD_PRIORITY            (RT_THREAD_PRIORITY_MAX/2)

static int n720_power_on(struct at_device *device)
{
    struct at_device_n720 *n720 = RT_NULL;

    n720 = (struct at_device_n720 *)device->user_data;

    if (n720->power_ctrl)
    {
        (n720->power_ctrl)(1);
        rt_thread_mdelay(2000);
    }
    if (n720->power_pin == -1)//no power on pin
    {
        return(RT_EOK);
    }
    if (n720->power_status_pin != -1)//use power status pin
    {
        n720->power_status = rt_pin_read(n720->power_status_pin);//read power status
    }
    if (n720->power_status)//power is on
    {
        return(RT_EOK);
    }

    rt_pin_write(n720->power_pin, PIN_HIGH);

    if (n720->power_status_pin != -1)//use power status pin
    {
        while (rt_pin_read(n720->power_status_pin) == PIN_LOW)
        {
            rt_thread_mdelay(10);
        }
    }

    rt_thread_mdelay(1000);

    rt_pin_write(n720->power_pin, PIN_LOW);

    n720->power_status = RT_TRUE;

    return(RT_EOK);
}

static int n720_power_off(struct at_device *device)
{
    struct at_device_n720 *n720 = RT_NULL;

    n720 = (struct at_device_n720 *)device->user_data;

    if (n720->power_ctrl)
    {
        n720->power_status = RT_FALSE;
        (n720->power_ctrl)(0);
        rt_thread_mdelay(2*1000);
        return(RT_EOK);
    }

    if (n720->power_pin == -1)//no power on pin
    {
        return(RT_EOK);
    }
    if (n720->power_status_pin != -1)//use power status pin
    {
        n720->power_status = rt_pin_read(n720->power_status_pin);//read power status
    }
    if ( ! n720->power_status)//power is off
    {
        return(RT_EOK);
    }

    if (n720->power_status_pin != -1)//use power status pin
    {
        rt_pin_write(n720->power_pin, PIN_HIGH);
        rt_thread_mdelay(1000);
        rt_pin_write(n720->power_pin, PIN_LOW);

        while (rt_pin_read(n720->power_status_pin) == PIN_HIGH)//wait power down
        {
            rt_thread_mdelay(100);
        }
    }
    else
    {
        at_obj_exec_cmd(device->client, RT_NULL, "$MYPOWEROFF");
        rt_thread_mdelay(5*1000);
    }

    n720->power_status = RT_FALSE;

    return(RT_EOK);
}

static int n720_sleep(struct at_device *device)
{
    //at_response_t resp = RT_NULL;
    struct at_device_n720 *n720 = RT_NULL;

    n720 = (struct at_device_n720 *)device->user_data;
    if ( ! n720->power_status)//power off
    {
        return(RT_EOK);
    }
    if (n720->sleep_status)//is sleep status
    {
        return(RT_EOK);
    }
    if (n720->wakeup_pin == -1)//use wakeup pin
    {
        LOG_E("no config wakeup pin, can not entry into sleep mode.");
        return(-RT_ERROR);
    }
    /*
    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
    if (resp == RT_NULL)
    {
        LOG_D("no memory for resp create.");
        return(-RT_ERROR);
    }

    if (at_obj_exec_cmd(device->client, resp, "AT+QSCLK=1") != RT_EOK)//enable sleep mode

    {
        LOG_D("enable sleep fail.\"AT+QSCLK=1\" execute fail.");
        at_delete_resp(resp);
        return(-RT_ERROR);
    }

    at_delete_resp(resp);
    */

    rt_pin_write(n720->wakeup_pin, PIN_HIGH);

    n720->sleep_status = RT_TRUE;

    return(RT_EOK);
}

static int n720_wakeup(struct at_device *device)
{
    //at_response_t resp = RT_NULL;
    struct at_device_n720 *n720 = RT_NULL;

    n720 = (struct at_device_n720 *)device->user_data;
    if ( ! n720->power_status)//power off
    {
        LOG_E("the power is off and the wake-up cannot be performed");
        return(-RT_ERROR);
    }
    if ( ! n720->sleep_status)//no sleep status
    {
        return(RT_EOK);
    }

    rt_pin_write(n720->wakeup_pin, PIN_LOW);
    rt_thread_mdelay(200);

    /*
    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
    if (resp == RT_NULL)
    {
        LOG_D("no memory for resp create.");
        return(-RT_ERROR);
    }
    if (at_obj_exec_cmd(device->client, resp, "AT+QSCLK=0") != RT_EOK)//disable sleep mode
    {
        LOG_D("wake up fail. \"AT+QSCLK=0\" execute fail.");
        at_delete_resp(resp);
        return(-RT_ERROR);
    }
    at_delete_resp(resp);
    */

    n720->sleep_status = RT_FALSE;

    return(RT_EOK);
}

static int n720_check_link_status(struct at_device *device)
{
    at_response_t resp = RT_NULL;
    struct at_device_n720 *n720 = RT_NULL;
    int result = -RT_ERROR;

    n720 = (struct at_device_n720 *)device->user_data;
    if ( ! n720->power_status)//power off
    {
        LOG_D("the power is off.");
        return(-RT_ERROR);
    }
    if (n720->sleep_status)//is sleep status
    {
        rt_pin_write(n720->wakeup_pin, PIN_LOW);
        rt_thread_mdelay(200);
    }

    resp = at_create_resp(64, 0, rt_tick_from_millisecond(300));
    if (resp == RT_NULL)
    {
        LOG_D("no memory for resp create.");
        return(-RT_ERROR);
    }

    result = -RT_ERROR;
    if (at_obj_exec_cmd(device->client, resp, "AT+CGREG?") == RT_EOK)
    {
        int link_stat = 0;
        if (at_resp_parse_line_args_by_kw(resp, "+CGREG:", "+CGREG: %*d,%d", &link_stat) > 0)
        {
            if (link_stat == 1 || link_stat == 5)
            {
                result = RT_EOK;
            }
        }
    }

    at_delete_resp(resp);

    if (n720->sleep_status)//is sleep status
    {
        rt_pin_write(n720->wakeup_pin, PIN_HIGH);
    }

    return(result);
}


/* =============================  n720 network interface operations ============================= */
/* set n720 network interface device status and address information */
static int n720_netdev_set_info(struct netdev *netdev)
{
#define N720_INFO_RESP_SIZE      128
#define N720_INFO_RESP_TIMO      rt_tick_from_millisecond(1000)

    int result = RT_EOK;
    ip_addr_t addr;
    at_response_t resp = RT_NULL;
    struct at_device *device = RT_NULL;

    RT_ASSERT(netdev);

    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
    if (device == RT_NULL)
    {
        LOG_E("get device(%s) failed.", netdev->name);
        return -RT_ERROR;
    }

    /* set network interface device status */
    netdev_low_level_set_status(netdev, RT_TRUE);
    netdev_low_level_set_link_status(netdev, RT_TRUE);
    netdev_low_level_set_dhcp_status(netdev, RT_TRUE);

    resp = at_create_resp(N720_INFO_RESP_SIZE, 0, N720_INFO_RESP_TIMO);
    if (resp == RT_NULL)
    {
        LOG_E("no memory for resp create.");
        result = -RT_ENOMEM;
        goto __exit;
    }

    /* set network interface device hardware address(IMEI) */
    {
        #define N720_NETDEV_HWADDR_LEN   8
        #define N720_IMEI_LEN            15

        char imei[N720_IMEI_LEN] = {0};
        int i = 0, j = 0;

        /* send "AT+GSN" commond to get device IMEI */
        if (at_obj_exec_cmd(device->client, resp, "AT+GSN") != RT_EOK)
        {
            result = -RT_ERROR;
            goto __exit;
        }

        if (at_resp_parse_line_args_by_kw(resp, "+GSN:", "%*[^\"]\"%[^\"]", imei) <= 0)
        {
            LOG_E("%s device prase \"AT+GSN\" cmd error.", device->name);
            result = -RT_ERROR;
            goto __exit;
        }

        LOG_D("%s device IMEI number: %s", device->name, imei);

        netdev->hwaddr_len = N720_NETDEV_HWADDR_LEN;
        /* get hardware address by IMEI */
        for (i = 0, j = 0; i < N720_NETDEV_HWADDR_LEN && j < N720_IMEI_LEN; i++, j+=2)
        {
            if (j != N720_IMEI_LEN - 1)
            {
                netdev->hwaddr[i] = (imei[j] - '0') * 10 + (imei[j + 1] - '0');
            }
            else
            {
                netdev->hwaddr[i] = (imei[j] - '0');
            }
        }
    }

    /* set network interface device IP address */
    {
        #define IP_ADDR_SIZE_MAX    16
        char ipaddr[IP_ADDR_SIZE_MAX] = {0};

        /* Get IP address */
        if (at_obj_exec_cmd(device->client, resp, "AT$MYNETACT?") != RT_EOK)
        {
            result = -RT_ERROR;
            goto __exit;
        }
        if (at_resp_parse_line_args_by_kw(resp, "$MYNETACT:", "$MYNETACT: %*[^\"]\"%[^\"]", ipaddr) <= 0)
        {
            LOG_E("%s device \"AT$MYNETACT?\" cmd error.", device->name);
            result = -RT_ERROR;
            goto __exit;
        }

        LOG_D("%s device IP address: %s", device->name, ipaddr);

        /* set network interface address information */
        inet_aton(ipaddr, &addr);
        netdev_low_level_set_ipaddr(netdev, &addr);
    }

    /* set network interface device dns server */
    {
        #define DNS_ADDR_SIZE_MAX 16
        char dns_server1[DNS_ADDR_SIZE_MAX] = {0}, dns_server2[DNS_ADDR_SIZE_MAX] = {0};

        at_resp_set_info(resp, N720_INFO_RESP_SIZE, 2, N720_INFO_RESP_TIMO);
        /* send "AT+DNSSERVER?" commond to get DNS servers address */
        if (at_obj_exec_cmd(device->client, resp, "AT+DNSSERVER?") < 0)
        {
            result = -RT_ERROR;
            goto __exit;
        }

        if (at_resp_parse_line_args_by_kw(resp, "+DNSSERVER:", "+DNSSERVER: dns1:%[^;];dns2:%s\r\n", dns_server1, dns_server2) <= 0)
        {
            LOG_E("Prase \"AT+DNSSERVER?\" commands resposne data error!");
            result = -RT_ERROR;
            goto __exit;
        }

        LOG_D("n58 device(%s) primary DNS server address: %s", device->name, dns_server1);
        LOG_D("n58 device(%s) secondary DNS server address: %s", device->name, dns_server2);

        inet_aton(dns_server1, &addr);
        netdev_low_level_set_dns_server(netdev, 0, &addr);

        inet_aton(dns_server2, &addr);
        netdev_low_level_set_dns_server(netdev, 1, &addr);
    }

__exit:
    if (resp)
    {
        at_delete_resp(resp);
    }

    return result;
}

static void n720_check_link_status_entry(void *parameter)
{
#define N720_LINK_DELAY_TIME    (60 * RT_TICK_PER_SECOND)

    rt_bool_t is_link_up;
    struct at_device *device = RT_NULL;
    struct netdev *netdev = (struct netdev *) parameter;

    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
    if (device == RT_NULL)
    {
        LOG_E("get device(%s) failed.", netdev->name);
        return;
    }

    while (1)
    {
        rt_thread_delay(N720_LINK_DELAY_TIME);

        is_link_up = (n720_check_link_status(device) == RT_EOK);

        netdev_low_level_set_link_status(netdev, is_link_up);
    }
}

static int n720_netdev_check_link_status(struct netdev *netdev)
{
#define N720_LINK_THREAD_TICK           20
#define N720_LINK_THREAD_STACK_SIZE     (1024 + 512)
#define N720_LINK_THREAD_PRIORITY       (RT_THREAD_PRIORITY_MAX - 2)

    rt_thread_t tid;
    char tname[RT_NAME_MAX] = {0};

    RT_ASSERT(netdev);

    rt_snprintf(tname, RT_NAME_MAX, "%s", netdev->name);

    /* create n720 link status polling thread  */
    tid = rt_thread_create(tname, n720_check_link_status_entry, (void *)netdev,
                           N720_LINK_THREAD_STACK_SIZE, N720_LINK_THREAD_PRIORITY, N720_LINK_THREAD_TICK);
    if (tid != RT_NULL)
    {
        rt_thread_startup(tid);
    }

    return RT_EOK;
}

static int n720_net_init(struct at_device *device);

static int n720_netdev_set_up(struct netdev *netdev)
{
    struct at_device *device = RT_NULL;

    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
    if (device == RT_NULL)
    {
        LOG_E("get device(%s) failed.", netdev->name);
        return -RT_ERROR;
    }

    if (device->is_init == RT_FALSE)
    {
        n720_net_init(device);
        device->is_init = RT_TRUE;

        netdev_low_level_set_status(netdev, RT_TRUE);
        LOG_D("network interface device(%s) set up status.", netdev->name);
    }

    return RT_EOK;
}

static int n720_netdev_set_down(struct netdev *netdev)
{
    struct at_device *device = RT_NULL;

    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
    if (device == RT_NULL)
    {
        LOG_E("get device(%s) failed.", netdev->name);
        return -RT_ERROR;
    }

    if (device->is_init == RT_TRUE)
    {
        n720_power_off(device);
        device->is_init = RT_FALSE;

        netdev_low_level_set_status(netdev, RT_FALSE);
        LOG_D("network interface device(%s) set down status.", netdev->name);
    }

    return RT_EOK;
}

static int n720_netdev_set_dns_server(struct netdev *netdev, uint8_t dns_num, ip_addr_t *dns_server)
{
#define N720_DNS_RESP_LEN    128
#define N720_DNS_RESP_TIMEO  rt_tick_from_millisecond(300)

    int result = RT_EOK;
    at_response_t resp = RT_NULL;
    struct at_device *device = RT_NULL;

    RT_ASSERT(netdev);
    RT_ASSERT(dns_server);

    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
    if (device == RT_NULL)
    {
        LOG_E("get device(%s) failed.", netdev->name);
        return -RT_ERROR;
    }

    resp = at_create_resp(N720_DNS_RESP_LEN, 0, N720_DNS_RESP_TIMEO);
    if (resp == RT_NULL)
    {
        LOG_D("no memory for resp create.");
        result = -RT_ENOMEM;
        goto __exit;
    }

    /* send "AT+QIDNSCFG=<pri_dns>[,<sec_dns>]" commond to set dns servers */
    if (at_obj_exec_cmd(device->client, resp, "AT+DNSSERVER=%d,%s", dns_num, inet_ntoa(*dns_server)) != RT_EOK)
    {
        result = -RT_ERROR;
        goto __exit;
    }

    netdev_low_level_set_dns_server(netdev, dns_num, dns_server);

__exit:
    if (resp)
    {
        at_delete_resp(resp);
    }

    return result;
}

#ifdef NETDEV_USING_PING
static int n720_netdev_ping(struct netdev *netdev, const char *host,
            size_t data_len, uint32_t timeout, struct netdev_ping_resp *ping_resp
#if RT_VER_NUM >= 0x50100
            , rt_bool_t is_bind
#endif
            )
{
#define N720_PING_RESP_SIZE       128
#define N720_PING_IP_SIZE         16
#define N720_PING_TIMEO           (5 * RT_TICK_PER_SECOND)

    rt_err_t result = RT_EOK;
    int response = -1, recv_data_len, ping_time, ttl;
    char ip_addr[N720_PING_IP_SIZE] = {0};
    at_response_t resp = RT_NULL;
    struct at_device *device = RT_NULL;

#if RT_VER_NUM >= 0x50100
    RT_UNUSED(is_bind);
#endif

    RT_ASSERT(netdev);
    RT_ASSERT(host);
    RT_ASSERT(ping_resp);

    device = at_device_get_by_name(AT_DEVICE_NAMETYPE_NETDEV, netdev->name);
    if (device == RT_NULL)
    {
        LOG_E("get device(%s) failed.", netdev->name);
        return -RT_ERROR;
    }

    resp = at_create_resp(N720_PING_RESP_SIZE, 4, N720_PING_TIMEO);
    if (resp == RT_NULL)
    {
        LOG_E("no memory for resp create");
        return -RT_ENOMEM;
    }

    /* send "AT+QPING=<contextID>"<host>"[,[<timeout>][,<pingnum>]]" commond to send ping request */
    if (at_obj_exec_cmd(device->client, resp, "AT+PING=1,%s,%d,1", host, timeout / RT_TICK_PER_SECOND) < 0)
    {
        result = -RT_ERROR;
        goto __exit;
    }

    at_resp_parse_line_args_by_kw(resp, "+PING:", "+PING:%d", &response);
    /* Received the ping response from the server */
    if (response == 0)
    {
        if (at_resp_parse_line_args_by_kw(resp, "+PING:", "+PING:%d,\"%[^\"]\",%d,%d,%d",
                                          &response, ip_addr, &recv_data_len, &ping_time, &ttl) <= 0)
        {
            result = -RT_ERROR;
            goto __exit;
        }
    }

    /* prase response number */
    switch (response)
    {
    case 0:
        inet_aton(ip_addr, &(ping_resp->ip_addr));
        ping_resp->data_len = recv_data_len;
        ping_resp->ticks = ping_time;
        ping_resp->ttl = ttl;
        result = RT_EOK;
        break;
    case 569:
        result = -RT_ETIMEOUT;
        break;
    default:
        result = -RT_ERROR;
        break;
    }

__exit:
    if (resp)
    {
        at_delete_resp(resp);
    }

    return result;
}
#endif /* NETDEV_USING_PING */



const struct netdev_ops n720_netdev_ops =
{
    n720_netdev_set_up,
    n720_netdev_set_down,

    RT_NULL,
    n720_netdev_set_dns_server,
    RT_NULL,

#ifdef NETDEV_USING_PING
    n720_netdev_ping,
#endif
    RT_NULL,
};

static struct netdev *n720_netdev_add(const char *netdev_name)
{
#define ETHERNET_MTU        1500
#define HWADDR_LEN          8
    struct netdev *netdev = RT_NULL;

    netdev = netdev_get_by_name(netdev_name);

    if(netdev != RT_NULL)
    {
        return netdev;
    }

    netdev = (struct netdev *)rt_calloc(1, sizeof(struct netdev));
    if (netdev == RT_NULL)
    {
        LOG_E("no memory for netdev create.");
        return RT_NULL;
    }

    netdev->mtu = ETHERNET_MTU;
    netdev->ops = &n720_netdev_ops;
    netdev->hwaddr_len = HWADDR_LEN;

#ifdef SAL_USING_AT
    extern int sal_at_netdev_set_pf_info(struct netdev *netdev);
    /* set the network interface socket/netdb operations */
    sal_at_netdev_set_pf_info(netdev);
#endif

    netdev_register(netdev, netdev_name, RT_NULL);

    return netdev;
}

/* =============================  n720 device operations ============================= */

/* initialize for n720 */
static void n720_init_thread_entry(void *parameter)
{
#define RESP_SIZE                      128
#define INIT_RETRY                     5
#define CPIN_RETRY                     10
#define CSQ_RETRY                      20
#define CGREG_RETRY                    50

    int i;
    int retry_num = INIT_RETRY;
    rt_err_t result = RT_EOK;
    at_response_t resp = RT_NULL;
    struct at_device *device = (struct at_device *) parameter;
    struct at_client *client = device->client;

    resp = at_create_resp(RESP_SIZE, 0, rt_tick_from_millisecond(300));
    if (resp == RT_NULL)
    {
        LOG_E("no memory for resp create.");
        return;
    }

    LOG_D("start init %s device.", device->name);

    while (retry_num--)
    {
        /* power on the n720 device */
        n720_power_on(device);
        rt_thread_mdelay(1000);

        /* wait n720 startup finish, send AT every 500ms, if receive OK, SYNC success*/
        if (at_client_obj_wait_connect(client, N720_WAIT_CONNECT_TIME))
        {
            result = -RT_ETIMEOUT;
            goto __exit;
        }
        rt_thread_mdelay(5000);

        /* disable echo */
        if (at_obj_exec_cmd(device->client, resp, "ATE0") != RT_EOK)
        {
            result = -RT_ERROR;
            goto __exit;
        }

        /* Get the baudrate */
        if (at_obj_exec_cmd(device->client, resp, "AT+IPR?") != RT_EOK)
        {
            result = -RT_ERROR;
            goto __exit;
        }
        at_resp_parse_line_args_by_kw(resp, "+IPR:", "+IPR: %d", &i);
        LOG_D("%s device baudrate %d", device->name, i);

        /* get module version */
        if (at_obj_exec_cmd(device->client, resp, "ATI") != RT_EOK)
        {
            result = -RT_ERROR;
            goto __exit;
        }
        for (i = 0; i < (int) resp->line_counts - 1; i++)
        {
            LOG_D("%s", at_resp_get_line(resp, i + 1));
        }

        /* check SIM card */
        for (i = 0; i < CPIN_RETRY; i++)
        {
            rt_thread_mdelay(1000);
            if (at_obj_exec_cmd(device->client, resp, "AT+CPIN?") == RT_EOK)
            {
                if (at_resp_get_line_by_kw(resp, "READY") != RT_NULL)
                    break;
            }
        }
        if (i == CPIN_RETRY)
        {
            LOG_E("%s device SIM card detection failed.", device->name);
            result = -RT_ERROR;
            goto __exit;
        }

        /* check signal strength */
        for (i = 0; i < CSQ_RETRY; i++)
        {
            rt_thread_mdelay(1000);
            if (at_obj_exec_cmd(device->client, resp, "AT+CSQ") == RT_EOK)
            {
                int signal_strength = 0, err_rate = 0;

                if (at_resp_parse_line_args_by_kw(resp, "+CSQ:", "+CSQ: %d,%d", &signal_strength, &err_rate) > 0)
                {
                    if ((signal_strength != 99) && (signal_strength != 0))
                    {
                        LOG_D("%s device signal strength: %d, channel bit error rate: %d",
                                device->name, signal_strength, err_rate);
                        break;
                    }
                }
            }
        }
        if (i == CSQ_RETRY)
        {
            LOG_E("%s device signal strength check failed", device->name);
            result = -RT_ERROR;
            goto __exit;
        }

        /* check the GPRS network is registered */
        for (i = 0; i < CGREG_RETRY; i++)
        {
            rt_thread_mdelay(1000);
            if (at_obj_exec_cmd(device->client, resp, "AT+CGREG?") == RT_EOK)
            {
                int link_stat = 0;

                if (at_resp_parse_line_args_by_kw(resp, "+CGREG:", "+CGREG: %*d,%d", &link_stat) > 0)
                {
                    if ((link_stat == 1) || (link_stat == 5))
                    {
                        LOG_D("%s device GPRS is registered", device->name);
                        break;
                    }
                }
            }
        }
        if (i == CGREG_RETRY)
        {
            LOG_E("%s device GPRS is register failed", device->name);
            result = -RT_ERROR;
            goto __exit;
        }

        if (((struct at_device_n720 *)(device->user_data))->wakeup_pin != -1)//use wakeup pin
        {
            if (at_obj_exec_cmd(device->client, resp, "AT+ENPWRSAVE=1") != RT_EOK)// enable sleep mode fail
            {
                result = -RT_ERROR;
                goto __exit;
            }
        }

        /* Activate context profile */
        resp = at_resp_set_info(resp, RESP_SIZE, 0, rt_tick_from_millisecond(30*1000));
        if (at_obj_exec_cmd(device->client, resp, "AT+CGATT=1") != RT_EOK)
        {
            result = -RT_ERROR;
            goto __exit;
        }

        /* Activate PPP */
        resp = at_resp_set_info(resp, RESP_SIZE, 0, rt_tick_from_millisecond(30*1000));
        if (at_obj_exec_cmd(device->client, resp, "AT$MYNETACT=0,1") != RT_EOK)
        {
            result = -RT_ERROR;
            goto __exit;
        }

        /* Get IP address */
        if (at_obj_exec_cmd(device->client, resp, "AT$MYNETACT?") == RT_EOK)
        {
            char ip_str[20];

            if (at_resp_parse_line_args_by_kw(resp, "$MYNETACT:", "$MYNETACT: %*[^\"]\"%[^\"]", ip_str) <= 0)
            {
                result = -RT_ERROR;
                goto __exit;
            }
        }

        /* initialize successfully  */
        result = RT_EOK;
        break;

    __exit:
        if (result != RT_EOK)
        {
            /* power off the n720 device */
            n720_power_off(device);
            rt_thread_mdelay(3000);

            LOG_I("%s device initialize retry...", device->name);
        }
    }

    if (resp)
    {
        at_delete_resp(resp);
    }

    if (result == RT_EOK)
    {
        /* set network interface device status and address information */
        n720_netdev_set_info(device->netdev);
        /* check and create link staus sync thread  */
        if (rt_thread_find(device->netdev->name) == RT_NULL)
        {
            n720_netdev_check_link_status(device->netdev);
        }

        LOG_I("%s device network initialize success.", device->name);
    }
    else
    {
        LOG_E("%s device network initialize failed(%d).", device->name, result);
    }
}

/* n720 device network initialize */
static int n720_net_init(struct at_device *device)
{
#ifdef AT_DEVICE_N720_INIT_ASYN
    rt_thread_t tid;

    tid = rt_thread_create("n720_net", n720_init_thread_entry, (void *)device,
                           N720_THREAD_STACK_SIZE, N720_THREAD_PRIORITY, 20);
    if (tid)
    {
        rt_thread_startup(tid);
    }
    else
    {
        LOG_E("create %s device init thread failed.", device->name);
        return -RT_ERROR;
    }
#else
    n720_init_thread_entry(device);
#endif /* AT_DEVICE_N720_INIT_ASYN */

    return RT_EOK;
}

static int n720_init(struct at_device *device)
{
    struct at_device_n720 *n720 = RT_NULL;

    RT_ASSERT(device);

    n720 = (struct at_device_n720 *) device->user_data;
    n720->power_status = RT_FALSE;//default power is off.
    n720->sleep_status = RT_FALSE;//default sleep is disabled.

    /* initialize AT client */
#if RT_VER_NUM >= 0x50100
    at_client_init(n720->client_name, n720->recv_line_num, n720->recv_line_num);
#else
    at_client_init(n720->client_name, n720->recv_line_num);
#endif

    device->client = at_client_get(n720->client_name);
    if (device->client == RT_NULL)
    {
        LOG_E("get AT client(%s) failed.", n720->client_name);
        return -RT_ERROR;
    }

    /* register URC data execution function  */
#ifdef AT_USING_SOCKET
    n720_socket_init(device);
#endif

    /* add n720 device to the netdev list */
    device->netdev = n720_netdev_add(n720->device_name);
    if (device->netdev == RT_NULL)
    {
        LOG_E("add netdev(%s) failed.", n720->device_name);
        return -RT_ERROR;
    }

    /* initialize n720 pin configuration */
    if (n720->power_pin != -1)
    {
        rt_pin_write(n720->power_pin, PIN_LOW);
        rt_pin_mode(n720->power_pin, PIN_MODE_OUTPUT);
    }
    if (n720->power_status_pin != -1)
    {
        rt_pin_mode(n720->power_status_pin, PIN_MODE_INPUT);
    }
    if (n720->wakeup_pin != -1)
    {
        rt_pin_write(n720->wakeup_pin, PIN_LOW);
        rt_pin_mode(n720->wakeup_pin, PIN_MODE_OUTPUT);
    }

    /* initialize n720 device network */
    return n720_netdev_set_up(device->netdev);
}

static int n720_deinit(struct at_device *device)
{
    RT_ASSERT(device);

    return n720_netdev_set_down(device->netdev);
}

static int n720_control(struct at_device *device, int cmd, void *arg)
{
    int result = -RT_ERROR;

    RT_ASSERT(device);

    switch (cmd)
    {
    case AT_DEVICE_CTRL_SLEEP:
        result = n720_sleep(device);
        break;
    case AT_DEVICE_CTRL_WAKEUP:
        result = n720_wakeup(device);
        break;
    case AT_DEVICE_CTRL_POWER_ON:
    case AT_DEVICE_CTRL_POWER_OFF:
    case AT_DEVICE_CTRL_RESET:
    case AT_DEVICE_CTRL_LOW_POWER:
    case AT_DEVICE_CTRL_NET_CONN:
    case AT_DEVICE_CTRL_NET_DISCONN:
    case AT_DEVICE_CTRL_SET_WIFI_INFO:
    case AT_DEVICE_CTRL_GET_SIGNAL:
    case AT_DEVICE_CTRL_GET_GPS:
    case AT_DEVICE_CTRL_GET_VER:
        LOG_W("not support the control command(%d).", cmd);
        break;
    default:
        LOG_E("input error control command(%d).", cmd);
        break;
    }

    return result;
}

const struct at_device_ops n720_device_ops =
{
    n720_init,
    n720_deinit,
    n720_control,
};

static int n720_device_class_register(void)
{
    struct at_device_class *class = RT_NULL;

    class = (struct at_device_class *) rt_calloc(1, sizeof(struct at_device_class));
    if (class == RT_NULL)
    {
        LOG_E("no memory for device class create.");
        return -RT_ENOMEM;
    }

    /* fill n720 device class object */
#ifdef AT_USING_SOCKET
    n720_socket_class_register(class);
#endif
    class->device_ops = &n720_device_ops;

    return at_device_class_register(class, AT_DEVICE_CLASS_N720);
}
INIT_DEVICE_EXPORT(n720_device_class_register);

#endif /* AT_DEVICE_USING_N720 */