i can connect websocket

[leeyc09]

url : ws://station1.walkinsights.com:80/api/monitoring

i can connect my websocket.
if i connect and then send emit like this
-> ex on js)
socket.emit("join", {square_mac: "f81a6749fe96"})
socket.on('signal')

but always return.
i don't know what is wrong!
please help me. solves my problem.