Implement perfect forwarding for command lib

esp_modem/include/cxx_include/esp_modem_terminal.hpp

@@ -0,0 +1,43 @@
+//
+// Created by david on 3/3/21.
+//
+
+#ifndef SIMPLE_CXX_CLIENT_ESP_MODEM_TERMINAL_HPP
+#define SIMPLE_CXX_CLIENT_ESP_MODEM_TERMINAL_HPP
+
+
+#include <memory>
+#include <functional>
+#include <exception>
+#include <cstddef>
+#include <cstdint>
+#include <utility>
+#include "esp_err.h"
+#include "esp_modem_primitives.hpp"
+
+
+enum class terminal_error {
+    BUFFER_OVERFLOW,
+    CHECKSUM_ERROR,
+    UNEXPECTED_CONTROL_FLOW,
+};
+
+class Terminal {
+public:
+    virtual ~Terminal() = default;
+    virtual void set_data_cb(std::function<bool(size_t len)> f) { on_data = std::move(f); }
+    void set_error_cb(std::function<void(terminal_error)> f) { on_error = std::move(f); }
+    virtual int write(uint8_t *data, size_t len) = 0;
+    virtual int read(uint8_t *data, size_t len) = 0;
+    virtual void start() = 0;
+    virtual void stop() = 0;
+    virtual size_t max_virtual_terms() { return 1; }
+
+protected:
+    std::function<bool(size_t len)> on_data;
+    std::function<void(terminal_error)> on_error;
+};
+
+
+
+#endif //SIMPLE_CXX_CLIENT_ESP_MODEM_TERMINAL_HPP