Create timesync JNI for testing client (#1433)

photon-targeting/src/main/native/include/net/TimeSyncServer.h

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) Photon Vision.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <fmt/core.h>
+#include <wpinet/EventLoopRunner.h>
+#include <wpinet/UDPClient.h>
+#include <wpinet/uv/Buffer.h>
+#include <wpinet/uv/Timer.h>
+#include <wpinet/uv/Udp.h>
+
+#include <atomic>
+#include <chrono>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+#include <functional>
+#include <iostream>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <thread>
+
+#include <wpi/Logger.h>
+#include <wpi/struct/Struct.h>
+
+#include "TimeSyncStructs.h"
+#include "ntcore_cpp.h"
+
+namespace wpi {
+namespace tsp {
+
+class TimeSyncServer {
+  using SharedUdpPtr = std::shared_ptr<uv::Udp>;
+
+  EventLoopRunner m_loopRunner{};
+
+  wpi::Logger m_logger;
+  std::function<uint64_t()> m_timeProvider;
+  SharedUdpPtr m_udp;
+
+  std::thread m_listener;
+
+ private:
+  void UdpCallback(uv::Buffer& buf, size_t nbytes, const sockaddr& sender,
+                   unsigned flags);
+
+ public:
+  explicit TimeSyncServer(int port = 5810,
+                          std::function<uint64_t()> timeProvider = nt::Now);
+
+  /**
+   * Start listening for pings
+   */
+  void Start();
+  /**
+   * Stop our loop runner. After stopping, we cannot restart.
+   */
+  void Stop();
+};
+
+}  // namespace tsp
+}  // namespace wpi