Keep vanetza-idf in obu-firmware, so a plain clone builds the firmware

obu-firmware builds against the vanetza-idf C-ITS library, which until now
came from the colleague's microbu-esp32c5 tree beside the repository and was
not tracked here, so a clone of this repository could not build the firmware
it ships. The library alone is now part of obu-firmware, as
obu-firmware/external/vanetza-idf: their external/vanetza-idf at commit
cf4b99f, unchanged (9775 files; see its PROVENANCE.md). CMake takes it from
there by default; -DVANETZA_IDF_DIR still points the build elsewhere.

The rest of the colleague's tree (their own VAM firmware, PKI tooling,
station-link Python tools, the V2X2MAP bridge) stays out of this repository
and gitignored; nothing is pushed to their repository. NOTES.md, docs/06,
TODO.md and the pcap verifier's usage line point at the new location.

obu-firmware/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);
+}
+