Returns an object containing various state info regarding P2P networking.

"version": xxxxx, (numeric) the server version
"subversion": "/Satoshi:x.x.x/", (string) the server subversion string
"protocolversion": xxxxx, (numeric) the protocol version
"localservices": "xxxxxxxxxxxxxxxx", (string) the services we offer to the network
"localrelay": true|false, (bool) true if transaction relay is requested from peers
"timeoffset": xxxxx, (numeric) the time offset
"connections": xxxxx, (numeric) the number of connections
"networkactive": true|false, (bool) whether p2p networking is enabled
"networks": [ (array) information per network
"name": "xxx", (string) network (ipv4, ipv6 or onion)
"limited": true|false, (boolean) is the network limited using -onlynet?
"reachable": true|false, (boolean) is the network reachable?
"proxy": "host:port" (string) the proxy that is used for this network, or empty if none
"proxy_randomize_credentials": true|false, (string) Whether randomized credentials are used
"relayfee": x.xxxxxxxx, (numeric) minimum relay fee for transactions in " + CURRENCY_UNIT + "/kB
"incrementalfee": x.xxxxxxxx, (numeric) minimum fee increment for mempool limiting or BIP 125 replacement in " + CURRENCY_UNIT + "/kB
"localaddresses": [ (array) list of local addresses
"address": "xxxx", (string) network address
"port": xxx, (numeric) network port
"score": xxx (numeric) relative score
"warnings": "..." (string) any network warnings

> bitcoin-cli getnetworkinfo
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getnetworkinfo", "params": [] }' -H 'content-type: text/plain;'
Don't trust. Verify. Docs extracted from src/rpc/net.cpp#L413-L454.