wss client connect error

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function testSSL()
local client = ws.client.sync({timeout=2})
local ok,err = client:connect("wss://echo.websocket.org/")
if not ok then
const.debug_print('could not connect', err);
end
local ok = client:send("Hello, World");
if ok then
print('msg sent')
else
print('connection closed')
end
local message,opcode = client:receive()
if message then
print('msg',message,opcode)
else
print('connection closed')
end
client:close()
end
testSSL()

------------------the error -------------------------------
lua: /usr/local/share/lua/5.1/ssl.lua:120: bad argument #1 to 'create' (SSL:Context expected, got nil)
stack traceback:
[C]: in function 'create'
/usr/local/share/lua/5.1/ssl.lua:120: in function 'wrap'
./websocket/sync.lua:131: in function 'connect'
websockHandle.lua:99: in function 'testSSL'
websockHandle.lua:122: in main chunk
[C]: ?

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If I use ws client the function works right, what's the problem?

Reproduce the wss connection using the example in the issue, then inspect websocket/sync.lua around line 131 and the failing ssl.lua:120 call. Trace how the SSL context is created for wss versus ws and compare the available connection setup. Done means the reported wss client error is understood and a verified correction or required setup is documented.

Written by the indexing model from the issue text.