#include <signal.h>
#include "open62541.h"

UA_Boolean running = true;
void signalHandler(int sig) {
    running = false;
}

int main(int argc, char** argv)
{
    signal(SIGINT, signalHandler); /* catch ctrl-c */

    /* create a server with one networklayer listening on port 4840 */
    UA_ServerConfig config = UA_ServerConfig_standard;
    UA_ServerNetworkLayer nl = UA_ServerNetworkLayerTCP(UA_ConnectionConfig_standard, 4840);
    config.networkLayers = &nl;
    config.networkLayersSize = 1;
    UA_Server *server = UA_Server_new(config);

    /* add a variable node */
    /* 1) set the variable attributes (no memory allocations here) */
    UA_Int32 myInteger = 42;
    UA_VariableAttributes attr;
    UA_VariableAttributes_init(&attr);
    UA_Variant_setScalar(&attr.value, &myInteger, &UA_TYPES[UA_TYPES_INT32]);
    attr.displayName = UA_LOCALIZEDTEXT("en_US", "the answer");

    /* 2) define where the variable shall be added with which browsename */
    UA_NodeId newNodeId = UA_NODEID_STRING(1, "the.answer");
    UA_NodeId parentNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER);
    UA_NodeId parentReferenceNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES);
    UA_NodeId variableType = UA_NODEID_NULL; /* no variable type defined */
    UA_QualifiedName browseName = UA_QUALIFIEDNAME(1, "the answer");

    /* 3) add the variable */
    UA_Server_addVariableNode(server, newNodeId, parentNodeId, parentReferenceNodeId,
                              browseName, variableType, attr, NULL, NULL);

    /* run the server loop */
    UA_StatusCode status = UA_Server_run(server, &running);
    UA_Server_delete(server);
    nl.deleteMembers(&nl);
    return status;
}

#include <stdio.h>
#include "open62541.h"

int main(int argc, char *argv[])
{
    /* create a client and connect */
    UA_Client *client = UA_Client_new(UA_ClientConfig_standard);
    UA_StatusCode status = UA_Client_connect(client, "opc.tcp://localhost:4840");
    if(status != UA_STATUSCODE_GOOD) {
        UA_Client_delete(client);
        return status;
    }

    /* read the value attribute of the node into the val variable */
    UA_Variant *val = UA_Variant_new();
    status = UA_Client_readValueAttribute(client, UA_NODEID_STRING(1, "the.answer"), val);
    if(status == UA_STATUSCODE_GOOD && UA_Variant_isScalar(val) &&
       val->type == &UA_TYPES[UA_TYPES_INT32]) {
        printf("the value is: %i\n", *(UA_Int32*)val->data);
    }

    UA_Variant_delete(val);
    UA_Client_delete(client); /* disconnects the client first */
    return status;
}