Hi Gunther, good catch : ) In fact, the isConnected() implementation is currently not soo god. In fact it checks if the underlying communication channel from netty is connected (which does not know that it is disconnected yet, in your case). We already had discussions to introduce a real "request" based implementation like "ping()" which sends a request.
Furthermore, for your use case there is the PooledDriverManager which does implicitly what you do... throws away a not working connection and issues a new one, if needed, but that’s a separate topic. I think we should spend some effort into this "ping" functionality. Perhaps you can even assist with the implementation Gunther, what do you think? Julian Am 26.03.19, 11:19 schrieb "Gunther Gruber" <[email protected]>: Put it another way, isConnected does not work as i expect it plcConnection.isConnected() returns true even when i disconnect the vpn (maybe of some tcp/ip keepalive?) this is the snippet of code which i expect to work (instead of the thread which reconnects ever 10 minutes) while (doCollect) { try { if (plcConnection == null || plcConnection.isConnected() == false) { plcConnection = initPLC(config.get(CONNECTION_KEY)); } } catch (PlcConnectionException e) { logger.log(Level.WARNING, "error connecting with driver", e); plcConnection = null; incrementalSleep(); break; } // Create a new read request: // - Give the single item requested the alias name "value" PlcReadRequest.Builder builder = plcConnection.readRequestBuilder(); Gunther Gruber
