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FLASHING.md says how to take a newer version of the colleague's tree (copy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/tests/repeater.cpp

@@ -0,0 +1,123 @@
+#include <gtest/gtest.h>
+#include <vanetza/common/manual_runtime.hpp>
+#include <vanetza/geonet/data_request.hpp>
+#include <vanetza/geonet/mib.hpp>
+#include <vanetza/geonet/packet.hpp>
+#include <vanetza/geonet/repeater.hpp>
+
+using namespace vanetza;
+using namespace vanetza::geonet;
+
+struct FakeRepetitionDispatcher : public boost::static_visitor<>
+{
+    FakeRepetitionDispatcher(Repeater& _repeater, const DownPacket& _packet) :
+        repeater(_repeater), packet(std::move(_packet))
+    {
+    }
+
+    template<typename REQUEST>
+    void operator()(const REQUEST& request)
+    {
+        repeater.add(request, std::move(packet));
+    }
+
+    Repeater& repeater;
+    const DownPacket& packet;
+};
+
+class RepeaterTest : public ::testing::Test
+{
+protected:
+    RepeaterTest() : repeater(runtime, repetition_callback()), dispatch_counter(0)
+    {
+    }
+
+    void SetUp() override
+    {
+        runtime.trigger(std::chrono::hours(23));
+        dispatch_counter = 0;
+    }
+
+    void dispatch_repetition(const DataRequestVariant& request, std::unique_ptr<DownPacket> packet)
+    {
+        ++dispatch_counter;
+        FakeRepetitionDispatcher dispatcher(repeater, *packet);
+        boost::apply_visitor(dispatcher, request);
+    }
+
+    Repeater::Callback repetition_callback()
+    {
+        namespace ph = std::placeholders;
+        return std::bind(&RepeaterTest::dispatch_repetition, this, ph::_1, ph::_2);
+    }
+
+    MIB mib;
+    ManualRuntime runtime;
+    Repeater repeater;
+    unsigned dispatch_counter;
+    const DownPacket packet;
+};
+
+
+
+TEST_F(RepeaterTest, no_repetition) {
+    runtime.trigger(std::chrono::seconds(3));
+    EXPECT_EQ(0, dispatch_counter);
+
+    ShbDataRequest shb(mib);
+    EXPECT_FALSE(!!shb.repetition);
+    repeater.add(shb, packet);
+    runtime.trigger(std::chrono::seconds(3));
+    EXPECT_EQ(0, dispatch_counter);
+
+    DataRequest::Repetition repetition;
+    repetition.interval = 5.0 * units::si::seconds;
+    repetition.maximum = 4.9 * units::si::seconds;
+    shb.repetition = repetition;
+    repeater.add(shb, packet);
+    EXPECT_EQ(0, dispatch_counter);
+    runtime.trigger(std::chrono::seconds(10));
+    EXPECT_EQ(0, dispatch_counter);
+}
+
+TEST_F(RepeaterTest, single_repetition) {
+    ShbDataRequest shb(mib);
+    DataRequest::Repetition repetition;
+    repetition.interval = 1.0 * units::si::seconds;
+    repetition.maximum = 1.0 * units::si::seconds;
+    shb.repetition = repetition;
+    repeater.add(shb, packet);
+    EXPECT_EQ(0, dispatch_counter);
+    runtime.trigger(runtime.now());
+    EXPECT_EQ(0, dispatch_counter);
+    runtime.trigger(std::chrono::milliseconds(900));
+    EXPECT_EQ(0, dispatch_counter);
+    runtime.trigger(std::chrono::seconds(1));
+    EXPECT_EQ(1, dispatch_counter);
+    runtime.trigger(std::chrono::seconds(5));
+    EXPECT_EQ(1, dispatch_counter);
+}
+
+TEST_F(RepeaterTest, multiple_repetition) {
+    ShbDataRequest shb(mib);
+    DataRequest::Repetition repetition;
+    repetition.interval = 2.0 * units::si::seconds;
+    repetition.maximum = 9.0 * units::si::seconds;
+    shb.repetition = repetition;
+    repeater.add(shb, packet);
+    EXPECT_EQ(0, dispatch_counter);
+    runtime.trigger(runtime.now());
+    EXPECT_EQ(0, dispatch_counter);
+    runtime.trigger(std::chrono::milliseconds(1900));
+    EXPECT_EQ(0, dispatch_counter);
+    runtime.trigger(std::chrono::milliseconds(100));
+    EXPECT_EQ(1, dispatch_counter);
+    runtime.trigger(std::chrono::seconds(2));
+    EXPECT_EQ(2, dispatch_counter);
+    // When triggered too slowly (large time difference), still just one repetition is triggered
+    runtime.trigger(std::chrono::seconds(5));
+    EXPECT_EQ(3, dispatch_counter);
+    runtime.trigger(std::chrono::seconds(10));
+    EXPECT_EQ(3, dispatch_counter);
+}
+