Returns information about network traffic, including bytes in, bytes out, and current time.
curl --user myuser --data-binary '{"jsonrpc":"1.0","id":"1","method":"getnettotals","params":[]}' -H 'content-type:text/plain;' http://127.0.0.1:8332/{
"totalbytesrecv": 5678901234,
"totalbytessent": 1234567890,
"timemillis": 1713571767000
}