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/IsoMux/connection/proxy.hpp

@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (C) 2022 chargebyte GmbH
+// Copyright (C) 2022 Contributors to EVerest
+
+#ifndef ISOMUX_PROXY_H
+#define ISOMUX_PROXY_H
+
+#include <arpa/inet.h>
+#include <cstddef>
+#include <netinet/in.h>
+#include <unistd.h>
+
+#include "../tools.hpp"
+
+/*!
+ * \brief connect to a local V2G server
+ * \param port port to connect to
+ * \param proxy_if_name network interface whose IPv6 link-local address is used
+ *        as the connection target.  Pass nullptr (default) to fall back to ::1.
+ * \return 0 on failure, otherwise the socket
+ */
+inline int proxy_connect(uint16_t port, const char* proxy_if_name = nullptr) {
+
+    int sock_fd = -1;
+    struct sockaddr_in6 server_addr {};
+
+    /* Create socket for communication with server */
+    sock_fd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
+    if (sock_fd == -1) {
+        perror("socket()");
+        return -1;
+    }
+
+    server_addr.sin6_family = AF_INET6;
+
+    if (proxy_if_name != nullptr && proxy_if_name[0] != '\0') {
+        /* Connect to the link-local address of the dedicated proxy interface */
+        if (get_interface_ipv6_address(proxy_if_name, ADDR6_TYPE_LINKLOCAL, &server_addr) != 0) {
+            perror("proxy_connect: get_interface_ipv6_address()");
+            close(sock_fd);
+            return -1;
+        }
+    } else {
+        /* Fall back to loopback */
+        inet_pton(AF_INET6, "::1", &server_addr.sin6_addr);
+    }
+
+    server_addr.sin6_port = htons(port);
+
+    /* Try to do TCP handshake with server */
+    int ret = connect(sock_fd, (struct sockaddr*)&server_addr, sizeof(server_addr));
+    if (ret == -1) {
+        perror("connect()");
+        close(sock_fd);
+        return -1;
+    }
+
+    return sock_fd;
+}
+
+#endif /* ISOMUX_PROXY_H */