AT组件 TCP SEND OK

发布于 2019-08-01 14:56:14 浏览：1913 订阅该版

Dear all：
                目前在BSP K210上用esp8266 串口wifi ，测试AT组件，用的uart2，配的收发是poll发送，中断接收。
                发现TCP发送数据后，等待SEND OK需要花费70~200ms的等待时间，发送数据完毕的时间经tick时间log确定没有问题！
                见下面代码：

static int esp8266_socket_send(struct at_socket *socket, const char *buff, size_t bfsz, enum at_socket_type type)
{
    int result = RT_EOK;
    int event_result = 0;
    size_t cur_pkt_size = 0, sent_size = 0;
    at_response_t resp = RT_NULL;
    int device_socket = (int) socket->user_data;
    struct at_device *device = (struct at_device *) socket->device;
    struct at_device_esp8266 *esp8266 = (struct at_device_esp8266 *) device->user_data;
    rt_mutex_t lock = device->client->lock;

RT_ASSERT(buff);
    RT_ASSERT(bfsz > 0);

resp = at_create_resp(128, 2, 5 * RT_TICK_PER_SECOND);
    if (resp == RT_NULL)
    {
        LOG_E("no memory for esp8266 device(%s) response structure.", device->name);
        return -RT_ENOMEM;
    }

rt_mutex_take(lock, RT_WAITING_FOREVER);

/* set current socket for send URC event */
    esp8266->user_data = (void *) device_socket;

/* set AT client end sign to deal with '>' sign */
    at_obj_set_end_sign(device->client, '>');

rt_tick_t timer_cnt = rt_tick_get( );
    rt_kprintf( "start send %d byte at tick-time %d<br>", bfsz, timer_cnt);     // 数据发送开始，打印tick时间
    while (sent_size < bfsz)
    {
        if (bfsz - sent_size < ESP8266_MODULE_SEND_MAX_SIZE)
        {
            cur_pkt_size = bfsz - sent_size;
        }
        else
        {
            cur_pkt_size = ESP8266_MODULE_SEND_MAX_SIZE;
        }

/* send the "AT+CIPSEND" commands to AT server than receive the '>' response on the first line */
        if (at_obj_exec_cmd(device->client, resp, "AT+CIPSEND=%d,%d", device_socket, cur_pkt_size) < 0)
        {
            result = -RT_ERROR;
            goto __exit;
        }

/* send the real data to server or client */
        result = (int) at_client_obj_send(device->client, buff + sent_size, cur_pkt_size);    
        if (result == 0)
        {
            result = -RT_ERROR;
            goto __exit;
        }

//// 数据发送完毕后，打印tick时间,  开始时间和此处时间差与实际波特率换算发送的字节时间基本一致
       //而下面的代码就是等待send ok的时间就比较长了，大概范围在40ms~200ms不等
        /* waiting result event from AT URC */
        if (esp8266_socket_event_recv(device, SET_EVENT(device_socket, 0), 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
        {
            LOG_E("esp8266 device(%s) socket(%d) send failed, wait connect result timeout.", device->name, device_socket);
            result = -RT_ETIMEOUT;
            goto __exit;
        }
        rt_kprintf( "end send at tick-time %d, sent %d<br>",  rt_tick_get( ) - timer_cnt,  result );
        /* waiting OK or failed result */
        event_result = esp8266_socket_event_recv(device, ESP8266_EVENT_SEND_OK | ESP8266_EVENT_SEND_FAIL, 
                            5 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
        if (event_result  < 0)
        {
            LOG_E("esp8266 device(%s) socket(%d) send failed, wait connect OK|FAIL timeout.", device->name, device_socket);
            result = -RT_ETIMEOUT;
            goto __exit;
        }
 //       rt_kprintf( "end send at tick-time %d, sent %d<br>",  rt_tick_get( ) - timer_cnt,  result );
        /* check result */
        if (event_result & ESP8266_EVENT_SEND_FAIL)
        {
            LOG_E("esp8266 device(%s) socket(%d) send failed.", device->name, device_socket);
            result = -RT_ERROR;
            goto __exit;
        }

sent_size += cur_pkt_size;
    }
    rt_kprintf( "end2 at tick-time %d<br>",  rt_tick_get( ) );
__exit:
    /* reset the end sign for data */
    at_obj_set_end_sign(device->client, 0);

rt_mutex_release(lock);

if (resp)
    {
        at_delete_resp(resp);
    }

return result;
}

一开始怀疑模组在发送tcp有时延send ok回复，为此直接串口工具+pc测试，发现模块并没有像与rtt k210串口连接出现的send ok等待的那么长，基本在3ms内（见串口工具数据下图数据）
[2019-08-01 02:07:18.233]【210个字节】
TX：12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890120

[2019-08-01 02:07:18.236]
RX：
busy s...

Recv 210 bytes

busy s...

SEND OK

[2019-08-01 02:07:27.923]
TX：AT+CIPSEND=210

[2019-08-01 02:07:27.928]
RX：
OK

请问这个情况问题会出现什么地方？