ShineLAN-X: Initiale Firmware + Hardware-Diagnose

- STM32F103RBT6 Firmware für Growatt ShineLAN-X
- Bitbang-SPI (EthernetENC) auf Port C (PC6/PC7/PC8/PC9)
- UART-Debug auf USART1 (PA9/PA10), Modbus temporär deaktiviert
- SO-Aktivitätstest und ESTAT-Register-Scan bestätigen:
  ENC28J60 läuft (SO aktiv), SI/MOSI-Verbindung unterbrochen
- Nächster Schritt: Pin 5 ENC28J60 nachlöten oder Bodge-Draht

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Growatt ShineLAN-X/firmware/lib/EthernetENC/src/utility/uipethernet-conf.h

@@ -0,0 +1,48 @@
+#ifndef UIPETHERNET_CONF_H
+#define UIPETHERNET_CONF_H
+
+// https://github.com/jandrassy/EthernetENC/wiki/Settings
+
+/* for TCP */
+#ifndef UIP_SOCKET_NUMPACKETS
+#define UIP_SOCKET_NUMPACKETS    3
+#endif
+#ifndef UIP_CONF_MAX_CONNECTIONS
+#define UIP_CONF_MAX_CONNECTIONS 4
+#endif
+
+/* for UDP
+ * set UIP_CONF_UDP to 0 to disable UDP (saves aprox. 4kB flash) */
+#ifndef UIP_CONF_UDP
+#define UIP_CONF_UDP             1
+#endif
+#ifndef UIP_CONF_UDP_CONNS
+#define UIP_CONF_UDP_CONNS       2
+#endif
+
+/**
+ * size of received UDP messages backlog. it must be at least 1
+ */
+#ifndef UIP_UDP_BACKLOG
+#define UIP_UDP_BACKLOG       2
+#endif
+
+/* timeout in ms for attempts to get a free memory block to write
+ * before returning number of bytes sent so far
+ * set to 0 to block until connection is closed by timeout */
+#ifndef UIP_WRITE_TIMEOUT
+#define UIP_WRITE_TIMEOUT    2000
+#endif
+
+/* timeout after which UIPClient::connect gives up. The timeout is specified in seconds.
+ * if set to a number <= 0 connect will timeout when uIP does (which might be longer than you expect...) */
+#ifndef UIP_CONNECT_TIMEOUT
+#define UIP_CONNECT_TIMEOUT      5
+#endif
+
+/* periodic timer for uip (in ms) */
+#ifndef UIP_PERIODIC_TIMER
+#define UIP_PERIODIC_TIMER       100
+#endif
+
+#endif