code: def _x_start_ok(self, client_properties, mechanism, response, locale):
          
          args = AMQPWriter()
          args.write_table(client_properties)
          args.write_shortstr(mechanism)
          args.write_longstr(response)
          args.write_shortstr(locale)
          self._send_method((10, 11), args)
docs: select security mechanism and locale
  
          This method selects a SASL security mechanism. ASL uses SASL
          (RFC2222) to negotiate authentication and encryption.
  
          PARAMETERS:
              client_properties: table
  
                  client properties
  
              mechanism: shortstr
  
                  selected security mechanism
  
                  A single security mechanisms selected by the client,
                  which must be one of those specified by the server.
  
                  RULE:
  
                      The client SHOULD authenticate using the highest-
                      level security profile it can handle from the list
                      provided by the server.
  
                  RULE:
  
                      The mechanism field MUST contain one of the
                      security mechanisms proposed by the server in the
                      Start method. If it doesn't, the server MUST close
                      the socket.
  
              response: longstr
  
                  security response data
  
                  A block of opaque data passed to the security
                  mechanism. The contents of this data are defined by
                  the SASL security mechanism.  For the PLAIN security
                  mechanism this is defined as a field table holding two
                  fields, LOGIN and PASSWORD.
  
              locale: shortstr
  
                  selected message locale
  
                  A single message local selected by the client, which
                  must be one of those specified by the server.