add resubscribe (in progress)

fix crash when no bus found in map

client/client.go

@@ -27,14 +27,19 @@ func NewClient(log *logging.Logger) *Client {
 	return &c
 }
 
+// Connect to websocket server
+// ip: ip address of server
 func (c *Client) Connect(ip, id string, port uint) (err error) {
 	c.conn, _, err = websocket.Dial(c.ctx, fmt.Sprintf("ws://%s:%d/ws?id=%s", ip, port, id), nil)
 	return
 }
 
+// Close connection to websocket server
 func (c *Client) Disconnect() {
 	c.cancel()
 }
+
+// Subscribe to websocket server
 func (c *Client) Subscribe(id string) error {
 
 	req := json_data.NewRequest()