| /* This work is licensed under a Creative Commons CCZero 1.0 Universal License. |
| * See http://creativecommons.org/publicdomain/zero/1.0/ for more information. */ |
| |
| #include <open62541/client.h> |
| #include <open62541/client_config_default.h> |
| #include <open62541/plugin/log_stdout.h> |
| |
| #include <signal.h> |
| #include <stdlib.h> |
| |
| UA_Boolean running = true; |
| |
| static void stopHandler(int sign) { |
| UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, "Received Ctrl-C"); |
| running = 0; |
| } |
| |
| static void |
| inactivityCallback (UA_Client *client) { |
| UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, "Server Inactivity"); |
| } |
| |
| int main(void) { |
| signal(SIGINT, stopHandler); /* catches ctrl-c */ |
| |
| UA_Client *client = UA_Client_new(); |
| UA_ClientConfig *cc = UA_Client_getConfig(client); |
| UA_ClientConfig_setDefault(cc); |
| |
| cc->inactivityCallback = inactivityCallback; /* Set stateCallback */ |
| cc->connectivityCheckInterval = 2000; /* Perform a connectivity check every 2 seconds */ |
| |
| /* Endless loop runAsync */ |
| while (running) { |
| /* if already connected, this will return GOOD and do nothing */ |
| /* if the connection is closed/errored, the connection will be reset and then reconnected */ |
| /* Alternatively you can also use UA_Client_getState to get the current state */ |
| UA_StatusCode retval = UA_Client_connect(client, "opc.tcp://localhost:4840"); |
| if(retval != UA_STATUSCODE_GOOD) { |
| UA_LOG_ERROR(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND, |
| "Not connected. Retrying to connect in 1 second"); |
| /* The connect may timeout after 1 second (see above) or it may fail immediately on network errors */ |
| /* E.g. name resolution errors or unreachable network. Thus there should be a small sleep here */ |
| UA_sleep_ms(1000); |
| continue; |
| } |
| |
| UA_Client_run_iterate(client, 1000); |
| }; |
| |
| /* Clean up */ |
| UA_Client_delete(client); /* Disconnects the client internally */ |
| return EXIT_SUCCESS; |
| } |