/// Call this automatically from server side each keepAliveInterval period
/// NOTE: ping payload must be 125 bytes or less
public void SendPing()
{
_pingCounter++;
_pingPayload = BitConverter.GetBytes(_pingCounter);
var payload = new ArraySegment <byte>(_pingPayload);
if (payload.Count > MAX_PING_PONG_PAYLOAD_LEN)
{
throw new InvalidOperationException($"Cannot send Ping: Max ping message size {MAX_PING_PONG_PAYLOAD_LEN} exceeded: {payload.Count}");
}
if (_state == WebSocketState.Open)
{
using (MemoryStream stream = _recycledStreamFactory())
{
NeedsPing = false;
WebSocketFrameWriter.Write(WebSocketOpCode.Ping, payload, stream, true, _isClient);
_logger(LogLevel.Debug, $"websocket.Ping: {payload.Count}");
WriteStreamToNetwork(stream);
}
}
}