Question about example in test.js

Hello,

When I run node test.js I see next output https://gist.github.com/KonstantinReido/82eddc48c9f73a366541

First question: Why ‘History received’ appear several times?
Second: Why value of startupTime is <Buffer b8 31 0d 00> it’s ok? (I added console.log(startupTime) in my test.js)
And one more: When I try get more than 600 new entries in getHistory method I receive next error.

(node) warning: possible EventEmitter memory leak detected. 11 read listeners added. Use emitter.setMaxListeners() to increase limit.
Trace
    at Characteristic.addListener (events.js:179:15)
    at /home/pi/node_modules/flower-power/node_modules/noble-device/lib/noble-device.js:91:22
    at Characteristic.<anonymous> (/home/pi/node_modules/flower-power/node_modules/noble/lib/characteristic.js:91:7)
    at Characteristic.g (events.js:199:16)
    at Characteristic.emit (events.js:129:20)
    at Noble.onNotify (/home/pi/node_modules/flower-power/node_modules/noble/lib/noble.js:307:20)
    at emit (events.js:118:17)
    at nobleBindings.onNotify (/home/pi/node_modules/flower-power/node_modules/noble/lib/linux/bindings.js:291:8)
    at emit (events.js:118:17)
    at null.<anonymous> (/home/pi/node_modules/flower-power/node_modules/noble/lib/linux/l2cap-ble.js:619:16)
(node) warning: possible EventEmitter memory leak detected. 11 read listeners added. Use emitter.setMaxListeners() to increase limit.