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+/* This work is licensed under a Creative Commons CCZero 1.0 Universal License.
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+ * See http://creativecommons.org/publicdomain/zero/1.0/ for more information. */
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+
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+/* Enable POSIX features */
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+#ifndef _XOPEN_SOURCE
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+# define _XOPEN_SOURCE 600
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+#endif
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+#ifndef _DEFAULT_SOURCE
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+# define _DEFAULT_SOURCE
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+#endif
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+/* On older systems we need to define _BSD_SOURCE.
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+ * _DEFAULT_SOURCE is an alias for that. */
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+#ifndef _BSD_SOURCE
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+# define _BSD_SOURCE
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+#endif
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+
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+/**
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+ * Client disconnect handling
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+ * --------------------------
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+ * This example shows you how to handle a client disconnect, e.g., if the server
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+ * is shut down while the client is connected. You just need to call connect
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+ * again and the client will automatically reconnect.
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+ *
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+ * This example is very similar to the tutorial_client_firststeps.c. */
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+
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+#include "open62541.h"
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+#include <signal.h>
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+
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+#ifdef _WIN32
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+# include <windows.h>
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+# define UA_sleep_ms(X) Sleep(X)
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+#else
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+# include <unistd.h>
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+# define UA_sleep_ms(X) usleep(X * 1000)
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+#endif
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+
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+UA_Boolean running = true;
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+UA_Logger logger = UA_Log_Stdout;
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+
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+static void stopHandler(int sign) {
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "Received Ctrl-C");
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+ running = 0;
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+}
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+
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+static void
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+handler_currentTimeChanged(UA_UInt32 monId, UA_DataValue *value, void *context) {
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "currentTime has changed!");
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+ if (UA_Variant_hasScalarType(&value->value, &UA_TYPES[UA_TYPES_DATETIME])) {
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+ UA_DateTime raw_date = *(UA_DateTime *) value->value.data;
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+ UA_DateTimeStruct dts = UA_DateTime_toStruct(raw_date);
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "date is: %02u-%02u-%04u %02u:%02u:%02u.%03u",
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+ dts.day, dts.month, dts.year, dts.hour, dts.min, dts.sec, dts.milliSec);
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+ }
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+}
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+
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+static void
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+stateCallback (UA_Client *client, UA_ClientState clientState){
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+
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+ switch (clientState){
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+ case UA_CLIENTSTATE_DISCONNECTED:
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "The client is disconnected");
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+ break;
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+ case UA_CLIENTSTATE_CONNECTED:
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "A TCP connection to the server is open");
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+ break;
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+ case UA_CLIENTSTATE_SECURECHANNEL:
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "A SecureChannel to the server is open");
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+ break;
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+ case UA_CLIENTSTATE_SESSION:{
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "A session with the server is open");
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+ /* A new session was created. We need to create the subscription. */
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+ /* Create a subscription */
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+ UA_UInt32 subId = 0;
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+ UA_Client_Subscriptions_new(client, UA_SubscriptionSettings_default, &subId);
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+ if(subId)
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "Create subscription succeeded, id %u", subId);
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+ else
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+ return;
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+
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+ /* Add a MonitoredItem */
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+ UA_UInt32 monId = 0;
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+ UA_NodeId monitorThis = UA_NODEID_NUMERIC(0, UA_NS0ID_SERVER_SERVERSTATUS_CURRENTTIME);
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+ UA_Client_Subscriptions_addMonitoredItem(client, subId, monitorThis, UA_ATTRIBUTEID_VALUE,
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+ &handler_currentTimeChanged, NULL, &monId, 250);
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+ if (monId)
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "Monitoring UA_NS0ID_SERVER_SERVERSTATUS_CURRENTTIME', id %u", subId);
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+ }
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+ break;
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+ case UA_CLIENTSTATE_SESSION_RENEWED:
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+ UA_LOG_INFO(logger, UA_LOGCATEGORY_USERLAND, "A session with the server is open (renewed)");
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+ /* The session was renewed. We don't need to recreate the subscription. */
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+ break;
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+ }
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+ return;
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+}
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+
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+int main(void) {
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+ signal(SIGINT, stopHandler); /* catches ctrl-c */
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+
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+ UA_ClientConfig config = UA_ClientConfig_default;
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+ /* Set stateCallback */
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+ config.stateCallback = stateCallback;
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+ UA_Client *client = UA_Client_new(config);
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+
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+ /* Endless loop SendPublishRequest */
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+ while (running) {
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+ /* if already connected, this will return GOOD and do nothing */
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+ /* if the connection is closed/errored, the connection will be reset and then reconnected */
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+ /* Alternatively you can also use UA_Client_getState to get the current state */
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+ UA_StatusCode retval = UA_Client_connect(client, "opc.tcp://localhost:4840");
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+ if (retval != UA_STATUSCODE_GOOD) {
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+ UA_LOG_ERROR(logger, UA_LOGCATEGORY_USERLAND, "Not connected. Retrying to connect in 1 second");
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+ /* The connect may timeout after 1 second (see above) or it may fail immediately on network errors */
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+ /* E.g. name resolution errors or unreachable network. Thus there should be a small sleep here */
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+ UA_sleep_ms(1000);
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+ continue;
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+ }
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+
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+ UA_Client_Subscriptions_manuallySendPublishRequest(client);
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+ UA_sleep_ms(1000);
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+ };
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+
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+ /* Clean up */
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+ UA_Client_delete(client); /* Disconnects the client internally */
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+ return UA_STATUSCODE_GOOD;
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+}
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StalderT