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/EvseV2G/connection/connection.hpp

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (C) 2022 chargebyte GmbH
+// Copyright (C) 2022 Contributors to EVerest
+
+#ifndef CONNECTION_H
+#define CONNECTION_H
+
+#include <cstddef>
+#include <netinet/in.h>
+
+#include "v2g_ctx.hpp"
+
+/*!
+ * \brief initialise TCP/TLS connections
+ * \param ctx the V2G context
+ * \return 0 on success
+ */
+int connection_init(struct v2g_context* ctx);
+
+/*!
+ * \brief start TCP/TLS servers
+ * \param ctx the V2G context
+ * \return 0 on success
+ */
+int connection_start_servers(struct v2g_context* ctx);
+int create_udp_socket(const uint16_t udp_port, const char* interface_name);
+
+/*!
+ * \brief check for V2G message sequence timeout
+ * \param ts_start start time
+ * \param ctx the V2G context
+ * \return true on timeout
+ */
+bool is_sequence_timeout(struct timespec ts_start, struct v2g_context* ctx);
+
+/*!
+ * \brief actions to take on connection close
+ * \param conn v2g connection context
+ */
+void connection_teardown(struct v2g_connection* conn);
+
+/*!
+ * \brief connection_read This abstracts a read from the connection socket, so that higher level functions
+ * are not required to distinguish between TCP and TLS connections.
+ * \param conn v2g connection context
+ * \param buf buffer to store received message sequence.
+ * \param count number of read bytes.
+ * \return Returns the number of read bytes if successful, otherwise returns -1 for reading errors and
+ * -2 for closed connection */
+ssize_t connection_read(struct v2g_connection* conn, unsigned char* buf, std::size_t count);
+
+/*!
+ * \brief connection_write This abstracts a write to the connection socket, so that higher level functions
+ * are not required to distinguish between TCP and TLS connections.
+ * \param conn v2g connection context
+ * \param buf buffer to store received message sequence.
+ * \param count size of the buffer
+ * \return Returns the number of read bytes if successful, otherwise returns -1 for reading errors and
+ * -2 for closed connection */
+ssize_t connection_write(struct v2g_connection* conn, unsigned char* buf, std::size_t count);
+
+#endif /* CONNECTION_H */