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diff --git a/lib/Json.h b/lib/Json.h
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+/*
+   Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012
+   Her Majesty the Queen in Right of Canada (Communications Research
+   Center Canada)
+
+   Copyright (C) 2023
+   Matthias P. Braendli, matthias.braendli@mpb.li
+
+    http://www.opendigitalradio.org
+
+   This module adds remote-control capability to some of the dabmux/dabmod modules.
+ */
+/*
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <list>
+#include <memory>
+#include <optional>
+#include <stdexcept>
+#include <string>
+#include <unordered_map>
+#include <variant>
+
+namespace json {
+
+    using map_t = std::unordered_map<std::string, struct value_t>;
+
+    struct value_t {
+        std::variant<
+            map_t,
+            std::string,
+            double,
+            size_t,
+            ssize_t,
+            bool,
+            std::nullopt_t> data;
+
+        template<class T>
+        value_t operator=(const T& map) {
+            value_t v;
+            v.data = map;
+            return v;
+        }
+
+    };
+
+    std::string map_to_json(const map_t& values);
+}