Keep the colleague's microbu-esp32c5 tree in this repository

obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but
that tree was gitignored, so a clone of this repository could not build the
firmware it ships. It is now committed here as ordinary files in its own
folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP
bridge's signature verification (--trust) used on the bench. Nothing is
fetched from or pushed to the colleague's repository; this repository and
its remotes carry everything. The folder's own .gitignore keeps build output,
downloaded components and private key material out, as it did there; the
committed file set is identical to that repository's tracked files.

The ESP32-C5 is still flashed from obu-firmware/, which only takes
vanetza-idf from microbu-esp32c5/, so the two stay separate folders.
FLASHING.md says how to take a newer version of the colleague's tree (copy
it over the folder, rebuild, test, commit).

microbu-esp32c5/external/vanetza-idf/vanetza/geonet/location_table.hpp

@@ -0,0 +1,147 @@
+#ifndef LOCATION_TABLE_HPP_EMPVZSHQ
+#define LOCATION_TABLE_HPP_EMPVZSHQ
+
+#include <vanetza/common/object_container.hpp>
+#include <vanetza/geonet/address.hpp>
+#include <vanetza/geonet/mib.hpp>
+#include <vanetza/geonet/position_vector.hpp>
+#include <vanetza/geonet/soft_state_map.hpp>
+#include <vanetza/geonet/station_type.hpp>
+#include <boost/range/adaptor/filtered.hpp>
+#include <boost/range/adaptor/map.hpp>
+
+namespace vanetza
+{
+namespace geonet
+{
+
+class LocationTableEntry
+{
+public:
+    LocationTableEntry(const Runtime& rt);
+
+    const Address& geonet_address() const;
+    const MacAddress& link_layer_address() const;
+    StationType station_type() const;
+
+    /**
+     * Get packed data rate (PDR) of corresponding source.
+     * \return PDR in bytes per second, might be not-a-number
+     */
+    double get_pdr() const { return m_pdr; }
+
+    /**
+     * Update packet data rate.
+     * See Annex B of EN 302 636-4-1 for details.
+     * \param packet_size received number of bytes
+     * \param beta weight factor for exponential moving average ]0; 1[
+     */
+    void update_pdr(std::size_t packet_size, double beta = 0.5);
+
+    /**
+     * Check if position vector has been set before
+     * \return  false after entry initialization
+     *          true after set_position_vector invocations
+     */
+    bool has_position_vector() const { return m_has_position_vector; }
+
+    /**
+     * Get stored position vector
+     * \return position vector (empty until set_position_vector invocation)
+     */
+    const LongPositionVector& get_position_vector() const { return m_position_vector; }
+
+    /**
+     * Update stored position vector (only after time stamp check)
+     * \param pv source position vector
+     * \return true if position vector passed time stamp check
+     */
+    bool update_position_vector(const LongPositionVector& pv);
+
+    /**
+     * Check if this entry belongs to a direct neighbour
+     * \return true if direct neighbour
+     */
+    bool is_neighbour() const;
+
+    /**
+     * Set neighbour relation
+     * \param flag true if entry represents a direct neighbour
+     */
+    void set_neighbour(bool flag);
+
+    /**
+     * Set neighbour relation with expiry
+     * \param flag true if entry represents a direct neighbour
+     * \param expiry reset neighbour relation to false after expiry
+     */
+    void set_neighbour(bool flag, Clock::duration expiry);
+
+    ObjectContainer extensions;
+
+private:
+    /**
+     * Set stored position vector (without timestamp check)
+     * \param pv source position vector
+     */
+    bool set_position_vector(const LongPositionVector& pv);
+
+    const Runtime& m_runtime;
+    Clock::time_point m_is_neighbour;
+    bool m_has_position_vector;
+    LongPositionVector m_position_vector;
+    double m_pdr; /*< packet data rate in bytes per second */
+    Clock::time_point m_pdr_update;
+};
+
+class LocationTableEntryCreator
+{
+public:
+    LocationTableEntryCreator(const Runtime& rt) : m_runtime(rt) {}
+    LocationTableEntry operator()() { return LocationTableEntry(m_runtime); }
+
+private:
+    const Runtime& m_runtime;
+};
+
+/**
+ * GeoNetworking LocationTable
+ * See section 7.1 of EN 302 636-4-1 for details.
+ */
+class LocationTable
+{
+public:
+    using table_type = SoftStateMap<MacAddress, LocationTableEntry, LocationTableEntryCreator>;
+    using entry_visitor = std::function<void(const MacAddress&, const LocationTableEntry&)>;
+    using entry_predicate = std::function<bool(const MacAddress&, const LocationTableEntry&)>;
+    using entry_range =
+        boost::select_second_const_range<
+            boost::filtered_range<
+                std::function<bool(const typename table_type::value_type&)>,
+                const typename table_type::map_range>>;
+    using neighbour_range = entry_range;
+
+    LocationTable(const MIB&, Runtime&);
+    bool has_entry(const Address&) const;
+    LocationTableEntry& update(const LongPositionVector&);
+    LocationTableEntry& get_or_create_entry(const Address&);
+    LocationTableEntry& get_or_create_entry(const MacAddress&);
+    const LocationTableEntry* get_entry(const Address&) const;
+    const LocationTableEntry* get_entry(const MacAddress&) const;
+    const LongPositionVector* get_position(const Address&) const;
+    const LongPositionVector* get_position(const MacAddress&) const;
+    bool has_neighbours() const;
+    neighbour_range neighbours() const;
+    entry_range filter(const entry_predicate&) const;
+    void visit(const entry_visitor&) const;
+    void drop_expired() { m_table.drop_expired(); }
+
+private:
+    table_type m_table;
+};
+
+} // namespace geonet
+} // namespace vanetza
+
+#endif /* LOCATION_TABLE_HPP_EMPVZSHQ */
+