Time lastPingRequest;

bool hcan::doSend(uint16 what, CanFrame& frame)
{
  if (!service.prepFrame(what, frame))
    return false;
  if (what == CanMethod::PING_REQUEST)
    lastPingRequest = GetSysTime();
  
  if (urc.RawSend(frame))
  ...
}

case CanMethod::PING_REPLAY:
{
  int64 pingLatency = GetSysTime() - ToTime(lastPingRequest);
  String tLogMsg = "Ping latency: ";
  tLogMsg << AsString(pingLatency);
  Log(2,tLogMsg);
}

Ping latency: 43909
Ping latency: 44138