code: func (s *SecureChannelSession) Unpair() error {
  	if s.PairingKey == nil {
  		return fmt.Errorf("Cannot unpair: not paired")
  	}
  
  	_, err := s.transmitEncrypted(claSCWallet, insUnpair, s.PairingIndex, 0, []byte{})
  	if err != nil {
  		return err
  	}
  	s.PairingKey = nil
  	// Close channel
  	s.iv = nil
  	return nil
  }
docs: // Unpair disestablishes an existing pairing.