@thisisseven said in QTOpcUa -- connectToEndPoint Error: "opc.tcp://localhost:4840" https://doc-snapshots.qt.io/qtopcua/qopcuaclient.html#connectToEndpoint https://doc-snapshots.qt.io/qtopcua/qopcuaclient.html#usage

@aha_1980 ok, thanks help again. regards.

QTcpSocket socMeteo; QTextStream texte(&socHauteur); These are 2 different sockets. What are you trying to do? It should be something like: auto socMeteo = new QTcpSocket(this); socMeteo->connectToHost("192.168.1.35",10001); connect(socMeteo,&QTcpSocket::connected,socMeteo,[socMeteo]()->void{ QTextStream texte(socMeteo); texte<<"Bonsoir\n"; });

@puzzled_giraffe QTcpsocket have not got "connectState" setup? I think qt use long tcp connection by default.

The handshake is the process that establishes the secure connection, in Qt QSslSocket::connectToHostEncrypted and QSslSocket::startServerEncryption take care of the handshake. The "Hello Word" sent across is just normal TCP communication that could be done even without encryption (i.e. using QTcpSocket)

@marlenet15 Hi, Here you can find a threaded TCP server example. You can ignore the module specific classes QDaemonApplication (think of it as QCoreApplication) and QDaemonLog you can substitute with QDebug. Enjoy! Kind regards.

Hi, You have the Fortune server and Fortune client that can serve as base to get you started. The main "detail" is that you want to exchange the sender and receiver part but the technique described there is still valid. Out of curiosity, how much is "large amount of data" ?

@stereomatchingkiss Indeed, such a huge amount of connections in such a short time would rather need a thread pool, otherwise you're going to starve your system.