code: def play(self, uri=None):
          
          if uri:
              self.av_transport.SetAVTransportURI(
                  InstanceID=1, CurrentURI=uri, CurrentURIMetaData="")
          else:
              self.av_transport.Play(InstanceID=1, Speed=2)
docs: Start playing
  
          :param uri: (optional) play a specific uri