RAK13800 Ethernet improvements

Fixes (#3618) by allowing more time for slower requests.
Resolve Syslog not maintaining client causing issues on RAK13800.
Resolve Ethernet static IP setting subnet as gateway IP.
Reduce comment and log message ambiguity around API.
Remove duplicate #if !MESHTASTIC_EXCLUDE_WEBSERVER block.

src/mesh/api/ServerAPI.cpp

@@ -5,7 +5,7 @@
 template <typename T>
 ServerAPI<T>::ServerAPI(T &_client) : StreamAPI(&client), concurrency::OSThread("ServerAPI"), client(_client)
 {
-    LOG_INFO("Incoming wifi connection\n");
+    LOG_INFO("Incoming API connection\n");
 }
 
 template <typename T> ServerAPI<T>::~ServerAPI()
@@ -49,6 +49,16 @@ template <class T, class U> int32_t APIServerPort<T, U>::runOnce()
     if (client) {
         // Close any previous connection (see FIXME in header file)
         if (openAPI) {
+#if RAK_4631
+            // RAK13800 Ethernet requests periodically take more time
+            // This backoff addresses most cases keeping max wait < 1s
+            // Reconnections are delayed by full wait time
+            if (waitTime < 400) {
+                waitTime *= 2;
+                LOG_INFO("Previous TCP connection still open, trying again in %dms\n", waitTime);
+                return waitTime;
+            }
+#endif
             LOG_INFO("Force closing previous TCP connection\n");
             delete openAPI;
         }
@@ -56,5 +66,8 @@ template <class T, class U> int32_t APIServerPort<T, U>::runOnce()
         openAPI = new T(client);
     }
 
+#if RAK_4631
+    waitTime = 100;
+#endif
     return 100; // only check occasionally for incoming connections
 }