Socket.io Swift client handler doesn't trigger - ios

Question

I have issue with soket.io client, and as I read here, you should define socket manager as a global variable so it's not released by ARC.
My code with that in mind:
let manager = SocketManager(socketURL: URL(string: Api.SOCKET)!, config: [.log(true), .path(Api.SOCKET_PATH)])
let socket: SocketIOClient?
....
override func viewDidLoad() {
super.viewDidLoad()
subscribeOnTransaction() { }
}
func subscribeOnTransaction() {
if self.socket == nil {
socket = manager.socket(forNamespace: Api.SOCKET_PATH)
subscribeToChangesChannel { }
socket?.on(clientEvent: .connect) { data, ack in
self.socket?.emit("transaction", self.sellOrder.id!)
}
self.socket?.on(clientEvent: .statusChange) {data, ack in
print(data)
}
self.socket?.connect()
}
}
func subscribeToChangesChannel(completion: #escaping () -> Void) {
if let socket = self.socket {
socket.on("transaction/\(self.sellOrder.id!)") { data, ack in
print(data, ack)
if data.count > 0 {
let rawResult = data[0]
if let result = rawResult as? [String: Any] {
let newRawValue = result["new_val"]
if let transaction = self.parseSocketResponse(newRawValue) {
self.openTransactionTrackingScreen(transaction)
completion()
}
}
}
}
}
}
But it doesn't call the handlers when I set breakpoints. Connection is established, everything's fine, with log turned on I get
Got polling response
LOG SocketEnginePolling: Got poll message:
What might be the problem? Any ideas? Will appreciate any help, thanks