poco没有展示unity游戏的元素树，termial报错“Address already in use\nError creating socket: Address already in use\n'”

[wodesenlin]

Remove any following parts if does not have details about

Describe the bug

AirtestIDE启动后，连接到ios的游戏界面，poco没有展示unity游戏到元素树

initializing Unity poco.
[rpc]connected
[Errno 54] Connection reset by peer
[Errno 32] Broken pipe
Traceback (most recent call last):
  File "/Users/wjjn3033/dev/idestable/airtest-ide/app/plugins/poco/poco_probe.py", line 111, in close
  File "/Applications/AirtestIDE.app/Contents/MacOS/poco/utils/simplerpc/rpcclient.py", line 44, in close
    self.conn.close()
  File "/Applications/AirtestIDE.app/Contents/MacOS/poco/utils/simplerpc/transport/tcp/main.py", line 43, in close
    self.c.close()
  File "/Applications/AirtestIDE.app/Contents/MacOS/poco/utils/simplerpc/transport/tcp/safetcp.py", line 72, in close
    self.sock.shutdown(socket.SHUT_RDWR)
OSError: [Errno 57] Socket is not connected
Traceback (most recent call last):
  File "/Users/wjjn3033/dev/idestable/airtest-ide/app/plugins/poco/poco_probe.py", line 82, in initPoco
  File "/Applications/AirtestIDE.app/Contents/MacOS/airtest/core/ios/instruct_helper.py", line 67, in do_proxy
    raise AirtestError((stdout, stderr))
airtest.core.error.AirtestError: ('', 'bind(): Address already in use\nError creating socket: Address already in use\n')

To Reproduce
Steps to reproduce the behaviour:

1. 参考以下链接的步骤，用Mac连接ipad（ios10.2）
   http://airtest.netease.com/docs/cn/2_device_connection/4_ios_connection.html
2. WebDriverAgentRunner 提示连接ipd成功

2019-06-11 13:34:40.101645 WebDriverAgentRunner-Runner[512:72792] Continuing to run tests in the background with task ID 1
Test Suite 'All tests' started at 2019-06-11 13:34:40.917
Test Suite 'WebDriverAgentRunner.xctest' started at 2019-06-11 13:34:40.920
Test Suite 'UITestingUITests' started at 2019-06-11 13:34:40.923
Test Case '-[UITestingUITests testRunner]' started.
    t =     0.00s Start Test at 2019-06-11 13:34:40.927
    t =     0.01s Set Up

3. 游戏Debug信息也显示Poco启动

Tcp server started and listening at 5002
PocoManager:Awake()

4.建立USB连接proxy 8100 8100

5. terminal启动AirtestIDE ，连接到ipad

6. poco unity树无内容，不能展示unity游戏的元素，报错信息见上“描述”

python version: python3.6

poco version: 1.0.69

未查询到poco信息

Smartphone (please complete the following information):

• Device: ipad mini2
• OS: ios 10.2

[wodesenlin]

以上现象之前，连接上ipad就已经出现了另一个问题“BrokenPipeError: [Errno 32] Broken Pipe”
AirtestProject/iOS-Tagent#57

[yimelia]

在unity尝试初始化时，会先尝试5001端口，如果失败会往后尝试5002-5004，现在看来是5001被使用了，所以它用了5002端口。
但是在IDE中，由于IOS连接前需要进行端口映射，所以写死了只映射5001端口号，导致没能成功连上你的unity游戏。
你可以先试一下：排查一下你的设备上面5001端口被什么应用占用了，尽量让它空出来给poco使用，然后再连上试试看。

[wodesenlin]

之前显示5002是我手动将端口改成了5002. 之后修改为5001端口并且外设更换成了ipad Air，能够连接到新的ipad。 连接虽不稳定，但是可以连接。不过在现在的不稳定状态下做测试还是挺不容易的。