pinger

fun CoroutineScope.pinger(outgoing: SendChannel<Frame>, periodMillis: Long, timeoutMillis: Long, pool: ObjectPool<ByteBuffer> = KtorDefaultPool): SendChannel<Frame.Pong>

Launch pinger coroutine on CoroutineScope that is sending ping every specified periodMillis to outgoing channel, waiting for and verifying client's pong frames. It is also handling timeoutMillis and sending timeout close frame