code: def _x_tune_ok(self, channel_max, frame_max, heartbeat):
          
          args = AMQPWriter()
          args.write_short(channel_max)
          args.write_long(frame_max)
          args.write_short(heartbeat or 0)
          self._send_method((10, 31), args)
          self._wait_tune_ok = False
docs: Negotiate connection tuning parameters
  
          This method sends the client's connection tuning parameters to
          the server. Certain fields are negotiated, others provide
          capability information.
  
          PARAMETERS:
              channel_max: short
  
                  negotiated maximum channels
  
                  The maximum total number of channels that the client
                  will use per connection.  May not be higher than the
                  value specified by the server.
  
                  RULE:
  
                      The server MAY ignore the channel-max value or MAY
                      use it for tuning its resource allocation.
  
              frame_max: long
  
                  negotiated maximum frame size
  
                  The largest frame size that the client and server will
                  use for the connection.  Zero means that the client
                  does not impose any specific limit but may reject very
                  large frames if it cannot allocate resources for them.
                  Note that the frame-max limit applies principally to
                  content frames, where large contents can be broken
                  into frames of arbitrary size.
  
                  RULE:
  
                      Until the frame-max has been negotiated, both
                      peers must accept frames of up to 4096 octets
                      large. The minimum non-zero value for the frame-
                      max field is 4096.
  
              heartbeat: short
  
                  desired heartbeat delay
  
                  The delay, in seconds, of the connection heartbeat
                  that the client wants. Zero means the client does not
                  want a heartbeat.