Doing what you suggested worked, I've also added hepipe.js, and then added a config.js with
var config = {
hep_config: {
debug: true,
HEP_SERVER: 'xxxxxxx',
HEP_PORT: xxxxx
},
esl_config: {
debug: true,
ESL_SERVER: '127.0.0.1',
ESL_PORT: 8021,
ESL_PASS...