#ifdef NOT_AMALGATED #include "ua_types.h" #include "ua_client.h" #else #include "open62541.h" #endif #include #include "networklayer_tcp.h" int main(int argc, char *argv[]) { UA_Client *client = UA_Client_new(); UA_ClientNetworkLayer nl = ClientNetworkLayerTCP_new(UA_ConnectionConfig_standard); UA_StatusCode retval = UA_Client_connect(client, UA_ConnectionConfig_standard, nl, "opc.tcp://localhost:16664"); if(retval != UA_STATUSCODE_GOOD) { UA_Client_delete(client); return retval; } UA_ReadRequest req; UA_ReadRequest_init(&req); req.nodesToRead = UA_ReadValueId_new(); req.nodesToReadSize = 1; req.nodesToRead[0].nodeId = UA_NODEID_STRING_ALLOC(1, "the.answer"); /* assume this node exists */ req.nodesToRead[0].attributeId = UA_ATTRIBUTEID_VALUE; UA_ReadResponse resp = UA_Client_read(client, &req); if(resp.responseHeader.serviceResult == UA_STATUSCODE_GOOD && resp.resultsSize > 0 && resp.results[0].hasValue && resp.results[0].value.data /* an empty array returns a null-ptr */ && resp.results[0].value.type == &UA_TYPES[UA_TYPES_INT32]) printf("the answer is: %i\n", *(UA_Int32*)resp.results[0].value.data); UA_ReadRequest_deleteMembers(&req); UA_ReadResponse_deleteMembers(&resp); UA_Client_disconnect(client); UA_Client_delete(client); return UA_STATUSCODE_GOOD; }