AT URC

关于AT组件中的URC接收数据问题

发布于 2021-03-26 10:56:28 浏览：1157 订阅该版

mii 2021-03-26

这家伙很懒，什么也没写！

可以参考一下AT组件下已经实现模组的接收响应函数，如M5311
```c
static void urc_recv_func(struct at_client *client, const char *data, rt_size_t size)
{
    int device_socket = 0;
    rt_int32_t timeout;
    rt_size_t bfsz = 0, temp_size = 0;
    char *recv_buf = RT_NULL, *hex_buf = RT_NULL, temp[8] = {0};
    char remote_addr[16] = {0};
    int remote_port = -1;

struct at_socket *socket = RT_NULL;
    struct at_device *device = RT_NULL;
    char *client_name = client->device->parent.name;

RT_ASSERT(data && size);

device = at_device_get_by_name(AT_DEVICE_NAMETYPE_CLIENT, client_name);
    if (device == RT_NULL)
    {
        LOG_E("get device(%s) failed.", client_name);
        return;
    }

hex_buf = (char *) rt_calloc(1, M5311_MODULE_RECV_MAX_SIZE * 2 + 1);

/* get the current socket and receive buffer size by receive data */
    /* mode 2 => +IPRD: <socket>,<remote_addr>, <remote_port>,<length>,<data> */
    sscanf(data, "+IPRD: %d,\"%[0-9.]\",%d,%d,%s", &device_socket, remote_addr, &remote_port, (int *) &bfsz, hex_buf);

/* set receive timeout by receive buffer length, not less than 10 ms */
    timeout = bfsz > 10 ? bfsz : 10;

if (device_socket < 0 || bfsz == 0)
        return;

recv_buf = (char *) rt_calloc(1, bfsz + 1);

if (recv_buf == RT_NULL || hex_buf == RT_NULL)
    {
        LOG_E("no memory for URC receive buffer(%d).", bfsz);
        /* read and clean the coming data */
        while (temp_size < bfsz)
        {
            if (bfsz - temp_size > sizeof(temp))
            {
                at_client_obj_recv(client, temp, sizeof(temp), timeout);
            }
            else
            {
                at_client_obj_recv(client, temp, bfsz - temp_size, timeout);
            }
            temp_size += sizeof(temp);
        }

if (recv_buf) rt_free(recv_buf);
        if (hex_buf)  rt_free(hex_buf);
        return;
    }

/* convert receive data */
    hex_to_string(hex_buf, recv_buf, bfsz);
    rt_free(hex_buf);

/* get at socket object by device socket descriptor */
    socket = &(device->sockets[device_socket]);

/* notice the receive buffer and buffer size */
    if (at_evt_cb_set[AT_SOCKET_EVT_RECV])
    {
        at_evt_cb_set[AT_SOCKET_EVT_RECV](socket, AT_SOCKET_EVT_RECV, recv_buf, bfsz);
    }
}
```