Cannot open multiple simultaneous connections

[schlomie]

It is not currently possible to open multiple simultaneous connections to remote machines using onlykey-agent.

Steps to reproduce:

1. Connect to machine A onlykey-agent -e e -c user@hostA
2. Attempt to connect to machine B onlykey-agent -e e -c user@hostB

The connection attempt to host B spits out the following python stack:

2018-03-01 16:21:58,247 ERROR failed to connect [client.py:182]
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/onlykey/client.py", line 178, in _connect
self._hid.open_path(path)
File "hid.pyx", line 72, in hid.device.open_path
IOError: open failed
2018-03-01 16:21:59,760 ERROR failed to connect [client.py:182]
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/onlykey/client.py", line 178, in _connect
self._hid.open_path(path)
File "hid.pyx", line 72, in hid.device.open_path
IOError: open failed
2018-03-01 16:22:01,267 ERROR failed to connect [client.py:182]
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/onlykey/client.py", line 178, in _connect
self._hid.open_path(path)
File "hid.pyx", line 72, in hid.device.open_path
IOError: open failed
2018-03-01 16:22:02,777 ERROR failed to connect [client.py:182]
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/onlykey/client.py", line 178, in _connect
self._hid.open_path(path)
File "hid.pyx", line 72, in hid.device.open_path
IOError: open failed
2018-03-01 16:22:04,286 ERROR failed to connect [client.py:182]
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/onlykey/client.py", line 178, in _connect
self._hid.open_path(path)
File "hid.pyx", line 72, in hid.device.open_path
IOError: open failed
Traceback (most recent call last):
File "/usr/bin/onlykey-agent", line 11, in
load_entry_point('onlykey-agent==0.0.2', 'console_scripts', 'onlykey-agent')()
File "/usr/lib/python2.7/site-packages/onlykey_agent/main.py", line 123, in wrapper
return func(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/onlykey_agent/main.py", line 136, in run_agent
with client_factory(curve=args.ecdsa_curve_name) as conn:
File "/usr/lib/python2.7/site-packages/onlykey_agent/client.py", line 28, in init
self.ok = OnlyKey()
File "/usr/lib/python2.7/site-packages/onlykey/client.py", line 162, in init
raise e
onlykey.client.OnlyKeyUnavailableException

After disconnecting from host A, the connection to host B works as expected.

Additional:
OnlyKey Color, Firmware Beta 6 STD
onlykey-agent
Arch Linux, 4.14.21-1-lts

Also, the --debug flag spits out exactly the same stack as without.

Original Google Group Thread: https://groups.google.com/forum/#!category-topic/onlykey/ssh-and-pgpgpg/vJcJsISkjPc