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.