code: func (c *MockConnection) Send(sinfo *ab.SeekInfo) error {
  	if c.Closed() {
  		return errors.New("mock connection is closed")
  	}
  
  	switch seek := sinfo.Start.Type.(type) {
  	case *ab.SeekPosition_Specified:
  		// Deliver all blocks from the given block number
  		fromBlock := seek.Specified.Number
  		c.Ledger().SendFrom(fromBlock)
  	case *ab.SeekPosition_Oldest:
  		// Deliver all blocks from the beginning
  		c.Ledger().SendFrom(0)
  	}
  
  	return nil
  }
docs: // Send mockcore sending seek info to the deliver server