Wstest as testeeserver with SSL

Hi,
Is there a way to pass SSL context factory to the following command?
~$ wstest -m testeeserver -w wss://10.6.0.50:8443 -c c1 -k k1

I got these error msg:
Using Twisted reactor class <class ‘twisted.internet.epollreactor.EPollReactor’>
Using UTF8 Validator class <type ‘wsaccel.utf8validator.Utf8Validator’>
Using XOR Masker classes <type ‘wsaccel.xormask.XorMaskerNull’>

Traceback (most recent call last):
File “/home/tester1/wstest/bin/wstest”, line 8, in
sys.exit(run())
File “/home/tester1/wstest/local/lib/python2.7/site-packages/autobahntestsuite/wstest.py”, line 346, in run
start(options, spec)
File “/home/tester1/wstest/local/lib/python2.7/site-packages/autobahntestsuite/wstest.py”, line 268, in start
res = wstest.startService()
File “/home/tester1/wstest/local/lib/python2.7/site-packages/autobahntestsuite/wstest.py”, line 209, in startService
return testee.startServer(self.options[‘wsuri’], debug = self.debug)
File “/home/tester1/wstest/local/lib/python2.7/site-packages/autobahntestsuite/testee.py”, line 188, in startServer
listenWS(factory, sslContext)
File “/home/tester1/wstest/local/lib/python2.7/site-packages/autobahn/twisted/websocket.py”, line 561, in listenWS
raise Exception(“Secure WebSocket listen requested, but no SSL context factory given”)
Exception: Secure WebSocket listen requested, but no SSL context factory given

~$ wstest -a
Autobahn 0.10.9
AutobahnTestSuite 0.8.1
~$ wstest --version
Twisted version: 19.7.0

Thanks,
Harry