You can enable it by appending the below lines into config.ini
# declare an appender named "rpc" that writes messages to rpc.log
[log.file_appender.rpc]
filename=logs/rpc/rpc.log
# filename can be absolute or relative to this config file
# route messages sent to the "rpc" logger to the rpc appender declared above
[logger.rpc]
level=debug
appenders=rpc
About Log level:
- level=error : logs errors
- level=warn : logs requests
- level=info : logs responses
(ref)