Unhandled promise rejection after a reconnection and during resubscribing to events

[Jason]

Getting an unhandled promise rejection when it's resubscribing to events after a reconnect and the socket drops the connection.

home-assistant-js-websocket/lib/connection.ts

Lines 156 to 159 in 5d14aee

 await this.sendMessagePromise( 
   messages.subscribeEvents(eventType), 
   commandId 
 ); 

Getting two different errors seems to be a race condition on which one gets thrown.

First One:

This is referencing the above SendMessagePromise

UnhandledPromiseRejectionWarning: Error: WebSocket is not open: readyState 2 (CLOSING)
    at WebSocket.send (/opt/node_modules/node-red-contrib-home-assistant-websocket/node_modules/ws/lib/websocket.js:314:19)
    at e.sendMessage (/opt/node_modules/home-assistant-js-websocket/dist/haws.umd.js:1:3458)
    at /opt/node_modules/home-assistant-js-websocket/dist/haws.umd.js:1:3630
    at new Promise (<anonymous>)
    at e.sendMessagePromise (/opt/node_modules/home-assistant-js-websocket/dist/haws.umd.js:1:3546)
    at p (/opt/node_modules/home-assistant-js-websocket/dist/haws.umd.js:1:8102)
    at w (/opt/node_modules/home-assistant-js-websocket/dist/haws.umd.js:1:8802)
    at /opt/node_modules/home-assistant-js-websocket/dist/haws.umd.js:1:7847
    at /opt/node_modules/home-assistant-js-websocket/dist/haws.umd.js:1:1440
    at Object.next (/opt/node_modules/home-assistant-js-websocket/dist/haws.umd.js:1:1545)

Second One:

home-assistant-js-websocket/lib/connection.ts

Lines 244 to 250 in 5d14aee

 // Reject in-flight requests 
 Object.keys(this.commands).forEach(id => { 
   const { reject } = this.commands[id]; 
   if (reject) { 
     reject(messages.error(ERR_CONNECTION_LOST, "Connection lost")); 
   } 
 }); 

Context:

Using node-red-contrib-home-assistant-websocket within hass.io and the addon-node-red. Everything works fine with the connection until you reboot hass.io and the addon is trying to reconnect. While trying to reconnect to Home Assistant it connects and disconnects from the hass.io proxy several times that's when the errors are getting thrown.

[Jason]

Duplicate because github was having issues #59