In order to use event's you should import the exported constants.

APP_ONLINE

should be emitted by the CLIENT when it goes online.

APP_OFFLINE

should be emitted by the CLIENT when it goes offline.

AMOUNT_OF_ADDRESSES_CHANGED

is emitted by the lib's when addresses are added / removed

MESSAGING_QUEUE_JOB_ADDED

emitted when a new job was added to the msg queue

TRANSACTION_QUEUE_JOB_ADDED

emitted when a job was added to the tx queue

ETH_TX_SIGN

emitted by web3 when there is need for signing an transaction. IMPORTANT! Don't forget to listen for this event. It is needed to sign an transaction.