How to Pass Credentials to Websocket from external domain?

Hello

We have built an implementation of MM using the api inside our app however we can not get the websocket connection authenticated . The websocket works as expected from inside the app if we actually log into Mattermost directly on the mattermost server. I assume this is because logging into Mattermost on the server sets the cookie .... but ... we need to be able to pass the token / cookie from our app.

I have tried the following;

var dataStream = $websocket('wss://chat.ourmattermostserver.com/api/v3/users/websocket?access_token='+$rootScope.mmToken);

var dataStream = $websocket('wss://chat.ourmattermostserver.com/api/v3/users/websocket', $rootScope.bearerMMToken); (i dont think you can pass headers to websocket so not surprised this didnt work) ...

Does anyone have any suggestions? This is quite urgent as we have a demo coming this Friday and this needs to work ..

Thank you.

Keith