Split net stack into eth/arp/ipv4/icmp, deferred handler responses, ping tests

firmware/include/net.h

@@ -1,19 +1,25 @@
 #pragma once
-#include <array>
-#include <cstdint>
+#include <expected>
 #include <functional>
 #include <span>
+#include "eth.h"
+#include "ipv4.h"
 #include "span_writer.h"
 #include "msgpack.h"
 
 struct net_state {
-    std::array<uint8_t, 6> mac;
-    std::array<uint8_t, 4> ip;
+    eth::mac_addr mac;
+    ipv4::ip4_addr ip;
 };
 
-using net_handler = std::function<msgpack::result<size_t>(std::span<const uint8_t> payload, span_writer &out)>;
+using net_handler = std::function<void(std::span<const uint8_t> payload,
+                                       std::function<void(std::span<const uint8_t>)> send)>;
+
+using net_frame_callback = std::function<void(std::span<const uint8_t> frame)>;
 
 bool net_init();
 const net_state& net_get_state();
 void net_set_handler(net_handler handler);
+void net_add_frame_callback(net_frame_callback cb);
 void net_poll(std::span<uint8_t> tx);
+void net_send_raw(std::span<const uint8_t> data);