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/btp/data_request.hpp

@@ -0,0 +1,50 @@
+#ifndef DATA_REQUEST_HPP_BSJC1VFV
+#define DATA_REQUEST_HPP_BSJC1VFV
+
+#include <vanetza/btp/header.hpp>
+#include <vanetza/common/its_aid.hpp>
+#include <vanetza/geonet/data_request.hpp>
+#include <vanetza/geonet/destination_variant.hpp>
+#include <vanetza/geonet/interface.hpp>
+#include <vanetza/geonet/lifetime.hpp>
+#include <vanetza/geonet/traffic_class.hpp>
+
+namespace vanetza
+{
+namespace btp
+{
+
+struct DataRequestGeoNetParams
+{
+    geonet::TransportType transport_type;
+    geonet::DestinationVariant destination;
+    geonet::CommunicationProfile communication_profile;
+    ItsAid its_aid;
+    boost::optional<geonet::Lifetime> maximum_lifetime;
+    boost::optional<unsigned> maximum_hop_limit;
+    boost::optional<geonet::DataRequest::Repetition> repetition;
+    geonet::TrafficClass traffic_class;
+};
+
+struct DataRequestA
+{
+    DataRequestA();
+
+    decltype(HeaderA::destination_port) destination_port;
+    decltype(HeaderA::source_port) source_port;
+    DataRequestGeoNetParams gn;
+};
+
+struct DataRequestB
+{
+    DataRequestB();
+
+    decltype(HeaderB::destination_port) destination_port;
+    decltype(HeaderB::destination_port_info) destination_port_info;
+    DataRequestGeoNetParams gn;
+};
+
+} // namespace btp
+} // namespace vanetza
+
+#endif /* DATA_REQUEST_HPP_BSJC1VFV */