The following patch relaxes type checking on attribute R/W functions.
This simplifies the "opcua read ..." and "opcua write ..." logic.
Another change allows the server's logger to be fully overriden.
It changes the default timeout to 10 milliseconds and adds some
functions to set the custom data type array on client and server.

--- open62541.c.orig	2019-11-08 09:27:46.000000000 +0100
+++ open62541.c	2019-11-08 10:10:33.207053379 +0100
@@ -22437,7 +22437,7 @@
 /* Main Server Loop */
 /********************/
 
-#define UA_MAXTIMEOUT 50 /* Max timeout in ms between main-loop iterations */
+#define UA_MAXTIMEOUT 10 /* Max timeout in ms between main-loop iterations */
 

         res->value.data = NULL;
+    } else if(UA_Variant_isScalar(&res->value) && outDataType == &UA_TYPES[UA_TYPES_VARIANT]) {
+        memcpy(out, &res->value, sizeof(UA_Variant));
+        UA_Variant_init(&res->value);
     } else {
         retval = UA_STATUSCODE_BADUNEXPECTEDERROR;
     }
@@ -51611,16 +51614,22 @@
 
 static UA_StatusCode
 setDefaultConfig(UA_ServerConfig *conf) {
+    UA_Logger logger;
+
     if (!conf)
         return UA_STATUSCODE_BADINVALIDARGUMENT;

     /* --> Start setting the default static config <-- */
     conf->nThreads = 1;
-    conf->logger = UA_Log_Stdout_;
+    conf->logger = logger;
 
     conf->shutdownDelay = 0.0;
 
@@ -56850,7 +56859,7 @@
     time_t gmt, rawtime = time(NULL);
 
     struct tm ptm;
-    gmtime_s(&ptm, &rawtime);
+    ptm = *gmtime(&rawtime);
     // Request that mktime() looksup dst in timezone database
     ptm.tm_isdst = -1;
     gmt = mktime(&ptm);
@@ -57935,3 +57944,17 @@
 
     return connection;
 }
+
+UA_StatusCode
+UA_Client_setCustomDataTypes(UA_Client *client, const UA_DataTypeArray *types) {
+  client->config.customDataTypes = types;
+
+  return UA_STATUSCODE_GOOD;
+}
+
+UA_StatusCode
+UA_Server_setCustomDataTypes(UA_Server *server, const UA_DataTypeArray *types) {
+  server->config.customDataTypes = types;
+
+  return UA_STATUSCODE_GOOD;
+}
--- open62541.h.orig	2019-11-08 09:27:46.000000000 +0100
+++ open62541.h	2019-11-08 10:09:12.150748976 +0100
@@ -95,7 +95,7 @@
  * On Win32: Define ``UA_DYNAMIC_LINKING`` and ``UA_DYNAMIC_LINKING_EXPORT`` in
  * order to export symbols for a DLL. Define ``UA_DYNAMIC_LINKING`` only to
  * import symbols from a DLL.*/
-#define UA_DYNAMIC_LINKING
+/* #undef UA_DYNAMIC_LINKING */
 

/* THIS IS A SINGLE-FILE DISTRIBUTION CONCATENATED FROM THE OPEN62541 SOURCES
 * visit http://open62541.org/ for information about this software
 * Git-Revision: v1.0-29-g95b3deb6
 */

/*
 * Copyright (C) 2014-2018 the contributors as stated in the AUTHORS file
 *
 * This file is part of open62541. open62541 is free software: you can
 * redistribute it and/or modify it under the terms of the Mozilla Public

_UA_END_DECLS


/*********************************** amalgamated original file "/home/travis/build/open62541/open62541/build/src_generated/open62541/types_generated_encoding_binary.h" ***********************************/

/* Generated from Opc.Ua.Types.bsd with script /home/travis/build/open62541/open62541/tools/generate_datatypes.py
 * on host travis-job-49e882ba-69aa-40f1-b88e-0acdafda6b10 by user travis at 2019-11-08 08:01:51 */

#ifdef UA_ENABLE_AMALGAMATION
#else
#endif

UA_ReadEventDetails_decodeBinary(const UA_ByteString *src, size_t *offset, UA_ReadEventDetails *dst) {
    return UA_decodeBinary(src, offset, dst, &UA_TYPES[UA_TYPES_READEVENTDETAILS], NULL);
}

/*********************************** amalgamated original file "/home/travis/build/open62541/open62541/build/src_generated/open62541/transport_generated.h" ***********************************/

/* Generated from Opc.Ua.Types.bsd, Custom.Opc.Ua.Transport.bsd with script /home/travis/build/open62541/open62541/tools/generate_datatypes.py
 * on host travis-job-49e882ba-69aa-40f1-b88e-0acdafda6b10 by user travis at 2019-11-08 08:01:51 */


#ifdef UA_ENABLE_AMALGAMATION
#else

#endif

_UA_END_DECLS


/*********************************** amalgamated original file "/home/travis/build/open62541/open62541/build/src_generated/open62541/transport_generated_handling.h" ***********************************/

/* Generated from Opc.Ua.Types.bsd, Custom.Opc.Ua.Transport.bsd with script /home/travis/build/open62541/open62541/tools/generate_datatypes.py
 * on host travis-job-49e882ba-69aa-40f1-b88e-0acdafda6b10 by user travis at 2019-11-08 08:01:51 */



_UA_BEGIN_DECLS

#if defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 6
# pragma GCC diagnostic push

_UA_END_DECLS


/*********************************** amalgamated original file "/home/travis/build/open62541/open62541/build/src_generated/open62541/transport_generated_encoding_binary.h" ***********************************/

/* Generated from Opc.Ua.Types.bsd, Custom.Opc.Ua.Transport.bsd with script /home/travis/build/open62541/open62541/tools/generate_datatypes.py
 * on host travis-job-49e882ba-69aa-40f1-b88e-0acdafda6b10 by user travis at 2019-11-08 08:01:51 */

#ifdef UA_ENABLE_AMALGAMATION
#else
#endif

UA_calcSizeBinary(const void *p, const UA_DataType *type) {
    return calcSizeBinaryJumpTable[type->typeKind](p, type);
}

/*********************************** amalgamated original file "/home/travis/build/open62541/open62541/build/src_generated/open62541/types_generated.c" ***********************************/

/* Generated from Opc.Ua.Types.bsd with script /home/travis/build/open62541/open62541/tools/generate_datatypes.py
 * on host travis-job-49e882ba-69aa-40f1-b88e-0acdafda6b10 by user travis at 2019-11-08 08:01:51 */


/* Boolean */
#define Boolean_members NULL

/* SByte */
#define SByte_members NULL

},
};


/*********************************** amalgamated original file "/home/travis/build/open62541/open62541/build/src_generated/open62541/transport_generated.c" ***********************************/

/* Generated from Opc.Ua.Types.bsd, Custom.Opc.Ua.Transport.bsd with script /home/travis/build/open62541/open62541/tools/generate_datatypes.py
 * on host travis-job-49e882ba-69aa-40f1-b88e-0acdafda6b10 by user travis at 2019-11-08 08:01:51 */


/* SecureConversationMessageAbortBody */
static UA_DataTypeMember SecureConversationMessageAbortBody_members[2] = {
{
    UA_TYPENAME("Error") /* .memberName */
    UA_TYPES_UINT32, /* .memberTypeIndex */

    0,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0,  0,  0,  0,  63,
    0,  26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51};

unsigned char *
UA_unbase64(const unsigned char *src, size_t len, size_t *out_len) {
    // we need a minimum length
    if(len <= 2) {
        *out_len = 0;
        return (unsigned char*)UA_EMPTY_ARRAY_SENTINEL;
    }

    const unsigned char *p = src;
    size_t pad1 = len % 4 || p[len - 1] == '=';
    size_t pad2 = pad1 && (len % 4 > 2 || p[len - 2] != '=');

                     from_b64[p[i + 2]] << 6 | from_b64[p[i + 3]];
        *pos++ = (unsigned char)(n >> 16);
        *pos++ = (unsigned char)(n >> 8 & 0xFF);
        *pos++ = (unsigned char)(n & 0xFF);
    }

    if(pad1) {
        if (last + 1 >= len) {
            UA_free(str);
            *out_len = 0;
            return (unsigned char*)UA_EMPTY_ARRAY_SENTINEL;
        }
        uint32_t n = from_b64[p[last]] << 18 | from_b64[p[last + 1]] << 12;
        *pos++ = (unsigned char)(n >> 16);
        if(pad2) {
            if (last + 2 >= len) {
                UA_free(str);
                *out_len = 0;
                return (unsigned char*)UA_EMPTY_ARRAY_SENTINEL;
            }
            n |= from_b64[p[last + 2]] << 6;
            *pos++ = (unsigned char)(n >> 8 & 0xFF);
        }
    }

    *out_len = (uintptr_t)(pos - str);
    return str;

/* THIS IS A SINGLE-FILE DISTRIBUTION CONCATENATED FROM THE OPEN62541 SOURCES
 * visit http://open62541.org/ for information about this software
 * Git-Revision: v1.0-29-g95b3deb6
 */

/*
 * Copyright (C) 2014-2018 the contributors as stated in the AUTHORS file
 *
 * This file is part of open62541. open62541 is free software: you can
 * redistribute it and/or modify it under the terms of the Mozilla Public

/**
 * open62541 Version
 * ----------------- */
#define UA_OPEN62541_VER_MAJOR 1
#define UA_OPEN62541_VER_MINOR 0
#define UA_OPEN62541_VER_PATCH 0
#define UA_OPEN62541_VER_LABEL "-29-g95b3deb6" /* Release candidate label, etc. */
#define UA_OPEN62541_VER_COMMIT "v1.0-29-g95b3deb6"

/**
 * Feature Options
 * ---------------
 * Changing the feature options has no effect on a pre-compiled library. */

#define UA_LOGLEVEL 300

_UA_END_DECLS


/*********************************** amalgamated original file "/home/travis/build/open62541/open62541/build/src_generated/open62541/types_generated.h" ***********************************/

/* Generated from Opc.Ua.Types.bsd with script /home/travis/build/open62541/open62541/tools/generate_datatypes.py
 * on host travis-job-49e882ba-69aa-40f1-b88e-0acdafda6b10 by user travis at 2019-11-08 08:01:51 */


#ifdef UA_ENABLE_AMALGAMATION
#else

#endif

_UA_END_DECLS


/*********************************** amalgamated original file "/home/travis/build/open62541/open62541/build/src_generated/open62541/types_generated_handling.h" ***********************************/

/* Generated from Opc.Ua.Types.bsd with script /home/travis/build/open62541/open62541/tools/generate_datatypes.py
 * on host travis-job-49e882ba-69aa-40f1-b88e-0acdafda6b10 by user travis at 2019-11-08 08:01:51 */



_UA_BEGIN_DECLS

#if defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 6
# pragma GCC diagnostic push