ping
Requests that a ping be sent to all other nodes, to measure ping time.
Result
Ping command is handled in queue with all other commands, so it measures processing backlog, not just network ping.
Result:
null (json null)
Examples
> bitcoin-cli ping
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "ping", "params": []}' -H 'content-type: text/plain;' http://127.0.0.1:8332/