docs: async def status(self, switch=None):
          """Get current relay status."""
          if switch is not None:
              if self.waiters or self.in_transaction:
                  fut = self.loop.create_future()
                  self.status_waiters.append(fut)
                  states = await fut
                  state = states[switch]
              else:
                  packet = self.protocol.format_packet(b"\x1e")
                  states = await self._send(packet)
                  state = states[switch]
          else:
              if self.waiters or self.in_transaction:
                  fut = self.loop.create_future()
                  self.status_waiters.append(fut)
                  state = await fut
              else:
                  packet = self.protocol.format_packet(b"\x1e")
                  state = await self._send(packet)
          return state