Ping = ref object of LPProtocol
  pingHandler*: PingHandler
  rng: ref BrHmacDrbgContext

PingError = object of LPError

PingHandler {.public.} = proc (peer: PeerId): Future[void] {....gcsafe,
    raises: [Defect].}

WrongPingAckError = object of PingError

PingCodec = "/ipfs/ping/1.0.0"

proc new(T: typedesc[Ping]; handler: PingHandler = nil;
         rng: ref BrHmacDrbgContext = newRng()): T:type {.public,
    ...raises: [Defect].}

proc ping(p: Ping; conn: Connection): Future[Duration] {....gcsafe, public(),
    stackTrace: false, ...gcsafe, raises: [Defect], raises: [Defect],
    tags: [RootEffect].}

method init(p: Ping) {....raises: [Defect], tags: [].}