Create a message using format/3 from Format and Args and send this to
the client. The default JavaScript client will call
console.log(Message) if there is a console. The predicate
pengine_rpc/3 calls debug(pengine(debug), '~w', [Message]). The debug
topic pengine(debug) is enabled by default.
See also
- debug/1 and nodebug/1 for controlling the pengine(debug) topic