RT-Thread-at_socket在连接udp服务器时出现“加载指令访问错误异常”RT-Thread问答社区

at_socket在连接udp服务器时出现“加载指令访问错误异常”

发布于 2024-12-13 11:16:46 浏览：82 订阅该版

```c
static int ml307_socket_connect(struct at_socket *socket, char *ip, int32_t port, enum at_socket_type type, rt_bool_t is_client)
{
    uint32_t event = 0;
    rt_bool_t retryed = RT_FALSE;
    at_response_t resp = RT_NULL;
    int result = RT_EOK, event_result = 0;
    int device_socket = (int) socket->user_data;
    struct at_device *device = (struct at_device *) socket->device;

RT_ASSERT(ip);
    RT_ASSERT(port >= 0);

resp = at_create_resp(128, 0, 5 * RT_TICK_PER_SECOND);
    if (resp == RT_NULL)
    {
        LOG_E("no memory for ml307 device(%s) response structure.", device->name);
        return -RT_ENOMEM;
    }

__retry:

/* clear socket connect event */
    event = SET_EVENT(device_socket, ML307_EVENT_CONN_OK | ML307_EVENT_CONN_FAIL);
    ml307_socket_event_recv(device, event, 0, RT_EVENT_FLAG_OR);

if (is_client)
    {
        switch (type)
        {
        case AT_SOCKET_TCP:
            /* send AT commands(eg: AT+MIPOPEN=0,"TCP","x.x.x.x", 1234) to connect TCP server */
            if (at_obj_exec_cmd(device->client, RT_NULL, "AT+MIPOPEN=%d,\"TCP\",\"%s\",%d", device_socket, ip, port) < 0)
            {
                result = -RT_ERROR;
                goto __exit;
            }
            break;

case AT_SOCKET_UDP:
            if (at_obj_exec_cmd(device->client, RT_NULL, "AT+MIPOPEN=%d,\"UDP\",\"%s\",%d", device_socket, ip, port) < 0)
            {
                result = -RT_ERROR;
                goto __exit;
            }
            break;

default:
            LOG_E("ml307 device(%s) not supported connect type : %d.", device->name, type);
            result = -RT_ERROR;
            goto __exit;
        }
            }
    rt_kprintf("AT+MIPOPEN = 1\n");
    /* waiting result event from AT URC, the device default connection timeout is 75 seconds, but it set to 10 seconds is convenient to use */
    if (ml307_socket_event_recv(device, SET_EVENT(device_socket, 0), 10 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR) < 0)
    {
        LOG_E("ml307 device(%s) socket(%d) connect failed, wait connect result timeout.",device->name, device_socket);
        result = -RT_ETIMEOUT;
        goto __exit;
    }
    rt_kprintf("AT+MIPOPEN = 2\n");
    /* waiting OK or failed result */
    event_result = ml307_socket_event_recv(device,
            ML307_EVENT_CONN_OK | ML307_EVENT_CONN_FAIL, 1 * RT_TICK_PER_SECOND, RT_EVENT_FLAG_OR);
    if (event_result < 0)
    {
        LOG_E("ml307 device(%s) socket(%d) connect failed, wait connect OK|FAIL timeout.", device->name, device_socket);
        result = -RT_ETIMEOUT;
        goto __exit;
    }
    rt_kprintf("AT+MIPOPEN = 3\n");
    /* check result */
    if (event_result & ML307_EVENT_CONN_FAIL)
    {
        if (retryed == RT_FALSE)
        {
            LOG_D("ml307 device(%s) socket(%d) connect failed, maybe the socket was not be closed at the last time and now will retry.",
                    device->name, device_socket);
            if (ml307_socket_close(socket) < 0)
            {
                result = -RT_ERROR;
                goto __exit;
            }
            retryed = RT_TRUE;
            goto __retry;
        }
        LOG_E("ml307 device(%s) socket(%d) connect failed.", device->name, device_socket);
        result = -RT_ERROR;
        goto __exit;
    }

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

return result;
}
```

执行了
```c
if (at_obj_exec_cmd(device->client, RT_NULL, "AT+MIPOPEN=%d,\"UDP\",\"%s\",%d", device_socket, ip, port) < 0)
```
之后异常。

下面是AT指令数据
```
[D/AT] sendline: 0000-0020: 41 54 2B 4D 49 50 4F 50  45 4E 3D 30 2C 22 55 44  50 22 2C 22 31 31 38 2E  33 31 2E 31 35 2E 31 35    AT+MIPOPEN=0,"UDP","118.31.15.15
[D/AT] sendline: 0020-0040: 32 22 2C 38 31 30 31 0D  0A                                                                           2",8101..
[D/AT] recvline: 0000-0020: 0D 0A                                                                                                 ..
[D/AT] recvline: 0000-0020: 4F 4B 0D 0A                                                                                           OK..
[D/AT] recvline: 0000-0020: 0D 0A                                                                                                 ..
[D/AT] recvline: 0000-0020: 2B 4D 49 50 4F 50 45 4E  3A 20 30 2C 30 0D 0A                                                         +MIPOPEN: 0,0..
CPU Exception: NO.5
x1: 40121ff0    x2: 300552a0    x3: 4025068c    x4: deadbeef
x5: 00001000    x6: 00000000    x7: 00000000    x8: 00010001
x9: 30054970    x10: 01010101   x11: 01010101   x12: 00000000
x13: 300541e0   x14: 00000001   x15: 000000ff   x16: 00000001
x17: 30053e72   x18: 80006088   x19: 3005498c   x20: 00000000
x21: 0000000d   x22: 4020d51c   x23: 40209c5c   x24: 4020d514
x25: 40209c60   x26: 4020d4d0   x27: 30054c0c   x28: 00000001
x29: 00000019   x30: 0000000a   x31: 7fffffff
mcause : 30000005
mtval  : 0101012d
mepc   : 4012201c
mstatus: 80007800
```