How to update the exchange-topology file in cardano-sl using nix

 Steps to update exchange-topology in cardano-sl using nix

- cd cardano-sl

- copy exchange-topology.yaml into this directory

- rename

/sample-wallet-config.nix

to

./custom-wallet-config.nix

- Make the following changes to the file

vi custom-wallet-config.nix

topologyFile = ./exchange-topology.yaml;

- Rebuild cardano-sl with the above file configuration something like

nix-build -A connectScripts.mainnet.wallet -o "./launch_$(date -I)_$(git rev-parse --short HEAD)"

- Launch cardano-sl pointing at the new topology file

./launch_20xx-xxxxx_xxxxx