code: def check_protocol(mcs, handler):
          
          protocol_info = mcs.PROTOCOL_INFO
          protocol_version = (protocol_info.major, protocol_info.minor)
          protocol_flags = protocol_info.flags
  
          # Check if minimum protocol version requirement is met
          min_protocol_version = getattr(handler, '_minimum_katcp_version', None)
          protocol_version_ok = (min_protocol_version is None or
                                 protocol_version >= min_protocol_version)
  
          # Check if required optional protocol flags are present
          required_katcp_protocol_flags = getattr(
              handler, '_has_katcp_protocol_flags', None)
          protocol_flags_ok = (
              required_katcp_protocol_flags is None or
              all(flag in protocol_flags
                  for flag in required_katcp_protocol_flags))
  
          return protocol_version_ok and protocol_flags_ok
docs: True if the current server's protocol flags satisfy handler requirements