当我尝试通过 python 中的 rpyc 连接时，ev3 关闭连接

Question

我在我的 ev3 积木上安装了 ev3dev，这样我就可以用 python 在上面创建程序了。我正在尝试使用 python 的“rpyc”库，可以在here. 找到但是，当我尝试运行上面链接中作为示例给出的这个基本脚本时：

import rpyc
conn = rpyc.classic.connect('192.168.137.3') # host name or IP address of the EV3
ev3 = conn.modules['ev3dev.ev3']      # import ev3dev.ev3 remotely
m = ev3.LargeMotor('outA')
m.run_timed(time_sp=1000, speed_sp=600)

我通过终端收到多个错误，然后连接关闭。我已按照页面上的所有说明进行操作，并且事先在 ev3 砖块上启动了服务器脚本。当我运行上述程序时，会显示来自 python 的错误：

Traceback (most recent call last):
  File "C:/Python27/cooode/moottertest.py", line 2, in <module>
    conn = rpyc.classic.connect('192.168.137.3') # host name or IP address of the EV3
  File "C:\Python27\lib\site-packages\rpyc\utils\classic.py", line 65, in connect
    return factory.connect(host, port, SlaveService, ipv6 = ipv6)
  File "C:\Python27\lib\site-packages\rpyc\utils\factory.py", line 90, in connect
    return connect_stream(s, service, config)
  File "C:\Python27\lib\site-packages\rpyc\utils\factory.py", line 51, in connect_stream
    return connect_channel(Channel(stream), service = service, config = config)
  File "C:\Python27\lib\site-packages\rpyc\utils\factory.py", line 40, in connect_channel
    return Connection(service, channel, config = config)
  File "C:\Python27\lib\site-packages\rpyc\core\protocol.py", line 147, in __init__
    self._init_service()
  File "C:\Python27\lib\site-packages\rpyc\core\protocol.py", line 150, in _init_service
    self._local_root.on_connect()
  File "C:\Python27\lib\site-packages\rpyc\core\service.py", line 145, in on_connect
    self._conn.builtin = self._conn.modules.__builtin__
  File "C:\Python27\lib\site-packages\rpyc\core\service.py", line 114, in __getattr__
    return self[name]
  File "C:\Python27\lib\site-packages\rpyc\core\service.py", line 111, in __getitem__
    self.__cache[name] = self.__getmodule(name)
  File "C:\Python27\lib\site-packages\rpyc\core\netref.py", line 196, in __call__
    return syncreq(_self, consts.HANDLE_CALL, args, kwargs)
  File "C:\Python27\lib\site-packages\rpyc\core\netref.py", line 71, in syncreq
    return conn.sync_request(handler, oid, *args)
  File "C:\Python27\lib\site-packages\rpyc\core\protocol.py", line 435, in sync_request
    self.serve(0.1)
  File "C:\Python27\lib\site-packages\rpyc\core\protocol.py", line 383, in serve
    data = self._recv(timeout, wait_for_lock = True)
  File "C:\Python27\lib\site-packages\rpyc\core\protocol.py", line 341, in _recv
    data = self._channel.recv()
  File "C:\Python27\lib\site-packages\rpyc\core\channel.py", line 50, in recv
    header = self.stream.read(self.FRAME_HEADER.size)
  File "C:\Python27\lib\site-packages\rpyc\core\stream.py", line 190, in read
    raise EOFError("connection closed by peer")
EOFError: connection closed by peer
>>> 

然后在我的 SSH 会话中，显示以下错误：

robot@ev3dev:~$ ./rpyc_server.sh
INFO:SLAVE/18812:server started on [0.0.0.0]:18812
INFO:SLAVE/18812:accepted 192.168.137.1:5725
INFO:SLAVE/18812:welcome [192.168.137.1]:5725
INFO:SLAVE/18812:goodbye [192.168.137.1]:5725
ERROR:SLAVE/18812:client connection terminated abruptly
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/rpyc/utils/server.py", line 172, in _authenticate_and_serve_client
    self._serve_client(sock2, credentials)
  File "/usr/lib/python3/dist-packages/rpyc/utils/server.py", line 197, in _serve_client
    conn._init_service()
  File "/usr/lib/python3/dist-packages/rpyc/core/protocol.py", line 154, in _init_service
    self._local_root.on_connect()
  File "/usr/lib/python3/dist-packages/rpyc/core/service.py", line 150, in on_connect
    self._conn.builtin = self._conn.modules.builtins
  File "/usr/lib/python3/dist-packages/rpyc/core/service.py", line 121, in __getattr__
    return self[name]
  File "/usr/lib/python3/dist-packages/rpyc/core/service.py", line 118, in __getitem__
    self.__cache[name] = self.__getmodule(name)
TypeError: 'b'instancemethod'' object is not callable
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.4/threading.py", line 868, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3/dist-packages/rpyc/utils/server.py", line 172, in _authenticate_and_serve_client
    self._serve_client(sock2, credentials)
  File "/usr/lib/python3/dist-packages/rpyc/utils/server.py", line 197, in _serve_client
    conn._init_service()
  File "/usr/lib/python3/dist-packages/rpyc/core/protocol.py", line 154, in _init_service
    self._local_root.on_connect()
  File "/usr/lib/python3/dist-packages/rpyc/core/service.py", line 150, in on_connect
    self._conn.builtin = self._conn.modules.builtins
  File "/usr/lib/python3/dist-packages/rpyc/core/service.py", line 121, in __getattr__
    return self[name]
  File "/usr/lib/python3/dist-packages/rpyc/core/service.py", line 118, in __getitem__
    self.__cache[name] = self.__getmodule(name)
TypeError: 'b'instancemethod'' object is not callable

这些错误中出了什么问题？

Answer 1

你是在连接python2和python3吗？ ev3dev 使用 python2。

使用pyenv安装python3并使用，这样你的PC和ev3的python版本是一样的。

https://gist.github.com/jaydenkieran/75b2bbc32b5b70c4fdfb161ecdb6daa2

您可能需要先运行此命令才能通过 curl 进行安装：

sudo apt-get install curl