Configuration
You can put the following options into a configuration file at .ethersync/config:
peer = <secret_address>
emit_join_code = <true/false>
emit_secret_address = <true/false>
After a successful ethersync join, the peer's secret address is automatically stored in your .ethersync/config.
In the future, you can then use ethersync join without a join code to reconnect to the same peer.