msgId fix and websocket status on server

[abkulakli]

MessageId is generated always. This fixes if you want to set msgID. Please see the code block below.

Line 1147: node-red-contrib-ocpp/ocpp/ocpp-server.js

      if (msg.payload.MessageId) {
        msg.msgId = msg.payload.MessageId;
      }

      msg.payload = {};

Also documentation says MessageID. There is a typo there. I am not sure where to fix it.

[abkulakli]

Added commit to send web socket connection status.

[bnystrom]

Thanks.
Changes edited into v1.3.5.

It was easier for me to add your changes to the modified upcoming code release.