Add extracted tools: CitrineOS, OpenOCPP, ShapeShifter

- CitrineOS core extracted (CSMS OCPP 2.0.1)
- OpenOCPP extracted (firmware OCPP 1.6J/2.0.1)
- ShapeShifter library installed (pip install -e)
- ShapeShifter specification extracted
- EVerest extracted

TODO updated with progress

tools/EVerest-main/modules/EVSE/EvseManager/tests/EventQueueTest.cpp

@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright Pionix GmbH and Contributors to EVerest
+#include <EventQueue.hpp>
+#include <gtest/gtest.h>
+
+#include <condition_variable>
+#include <mutex>
+#include <thread>
+
+namespace {
+
+enum class ErrorHandlingEvents : std::uint8_t {
+    PreventCharging,
+    PreventChargingWelded,
+    AllErrorsCleared
+};
+
+TEST(EventQueue, init) {
+    module::EventQueue<ErrorHandlingEvents> queue;
+    auto events = queue.get_events();
+    EXPECT_EQ(events.size(), 0);
+}
+
+TEST(EventQueue, one) {
+    module::EventQueue<ErrorHandlingEvents> queue;
+    auto events = queue.get_events();
+    EXPECT_EQ(events.size(), 0);
+
+    queue.push(ErrorHandlingEvents::PreventCharging);
+    events = queue.get_events();
+    ASSERT_EQ(events.size(), 1);
+    EXPECT_EQ(events[0], ErrorHandlingEvents::PreventCharging);
+
+    events = queue.get_events();
+    EXPECT_EQ(events.size(), 0);
+}
+
+TEST(EventQueue, two) {
+    module::EventQueue<ErrorHandlingEvents> queue;
+    auto events = queue.get_events();
+    EXPECT_EQ(events.size(), 0);
+
+    queue.push(ErrorHandlingEvents::PreventCharging);
+    queue.push(ErrorHandlingEvents::PreventChargingWelded);
+    events = queue.get_events();
+    ASSERT_EQ(events.size(), 2);
+    EXPECT_EQ(events[0], ErrorHandlingEvents::PreventCharging);
+    EXPECT_EQ(events[1], ErrorHandlingEvents::PreventChargingWelded);
+
+    events = queue.get_events();
+    EXPECT_EQ(events.size(), 0);
+}
+
+TEST(EventQueue, wait) {
+    module::EventQueue<ErrorHandlingEvents> queue;
+    auto events = queue.get_events();
+    EXPECT_EQ(events.size(), 0);
+
+    std::size_t count = 0;
+    std::condition_variable cv;
+    std::mutex mux;
+    bool ready{false};
+
+    std::thread wait_thread([&cv, &count, &queue, &ready, &mux]() {
+        {
+            std::lock_guard<std::mutex> lock(mux);
+            ready = true;
+        }
+        cv.notify_one();
+        auto events = queue.wait();
+        count = events.size();
+        {
+            std::lock_guard<std::mutex> lock(mux);
+            ready = false;
+        }
+        cv.notify_one();
+    });
+
+    std::unique_lock<std::mutex> ul(mux);
+    cv.wait(ul, [&ready] { return ready; });
+    ASSERT_EQ(count, 0U);
+
+    queue.push(ErrorHandlingEvents::PreventCharging);
+
+    cv.wait(ul, [&ready] { return !ready; });
+    ASSERT_EQ(count, 1U);
+
+    events = queue.get_events();
+    EXPECT_EQ(events.size(), 0);
+
+    wait_thread.join();
+}
+
+} // namespace