Fix static ethernet config

With static ethernet config, `status` stayed `0` which let the function return
without setting `ethEvent`. Therefore, `reconnectETH` was never called and network services were never started.

Also, the RAK4631 uses little endian, which is why the IP addresses need to be
converted before setting them.

Fixes meshtastic#2543

src/mesh/eth/ethClient.cpp

@@ -98,6 +98,13 @@ static int32_t reconnectETH()
     return 5000; // every 5 seconds
 }
 
+static uint32_t bigToLittleEndian(uint32_t value) {
+    return ((value >> 24) & 0xFF)
+         | ((value >> 8) & 0xFF00)
+         | ((value << 8) & 0xFF0000)
+         | ((value << 24) & 0xFF000000);
+}
+
 // Startup Ethernet
 bool initEthernet()
 {
@@ -126,7 +133,15 @@ bool initEthernet()
             status = Ethernet.begin(mac);
         } else if (config.network.address_mode == meshtastic_Config_NetworkConfig_AddressMode_STATIC) {
             LOG_INFO("starting Ethernet Static\n");
-            Ethernet.begin(mac, config.network.ipv4_config.ip, config.network.ipv4_config.dns, config.network.ipv4_config.subnet);
+
+            IPAddress ip = IPAddress(bigToLittleEndian(config.network.ipv4_config.ip));
+            IPAddress dns = IPAddress(bigToLittleEndian(config.network.ipv4_config.dns));
+            IPAddress gateway = IPAddress(bigToLittleEndian(config.network.ipv4_config.gateway));
+            IPAddress subnet = IPAddress(bigToLittleEndian(config.network.ipv4_config.subnet));
+
+            Ethernet.begin(mac, ip, dns, gateway, subnet);
+
+            status = 1;
         } else {
             LOG_INFO("Ethernet Disabled\n");
             return false;