优化脚本，避免938下面ip丢失问题

更好的方法是固件优化

app/src/main/assets/eth.sh

@@ -27,10 +27,11 @@ cleanup() {
 }
 trap cleanup INT TERM
 
+# Get script directory for finding tools like ethtool
 SCRIPT_PATH="$0"
-# 确保路径是绝对路径
+# Ensure path is absolute
 case "$SCRIPT_PATH" in
-  /*) ;;  # 已经是绝对路径
+  /*) ;;  # Already absolute path
   *) SCRIPT_PATH="$PWD/$SCRIPT_PATH" ;;
 esac
 SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
@@ -77,7 +78,7 @@ fi
 if [ -x "$SCRIPT_DIR/ethtool" ]; then
   echo "Using ethtool from script directory: $SCRIPT_DIR/ethtool"
   "$SCRIPT_DIR/ethtool" -s eth0 speed 10 duplex full autoneg off
-# 其次尝试使用原路径
+# Try alternative path next
 elif [ -x "/data/data/com.xypower.mpapp/files/ethtool" ]; then
   echo "Configuring eth0 to 10Mbps full duplex..."
   /data/data/com.xypower.mpapp/files/ethtool -s eth0 speed 10 duplex full autoneg off
@@ -91,31 +92,90 @@ else
   fi
 fi
 
-# Configure IP address
+# ====================================================
+# MTK Android 9 IP configuration with loss prevention
+# ====================================================
+
+# Configure IP address first while interface is DOWN
+echo "Setting IP address while interface is DOWN..."
 /system/bin/ip addr add $ETH_IP/$ETH_NETMASK broadcast $ETH_BROADCAST dev eth0
+PRE_UP_IP=$(/system/bin/ip addr show eth0 | grep -c "inet $ETH_IP")
+echo "IP configuration before UP: $PRE_UP_IP (1=configured, 0=missing)"
 
 # Enable interface and wait for UP
+echo "Bringing up interface..."
 /system/bin/ip link set eth0 up
+sleep 0.2
+
+# Check if IP was lost after interface UP (common issue on MTK devices)
+POST_UP_IP=$(/system/bin/ip addr show eth0 | grep -c "inet $ETH_IP")
+echo "IP configuration after UP: $POST_UP_IP (1=retained, 0=lost)"
+
+# IP address lost detection and recovery
+if [ "$PRE_UP_IP" = "1" ] && [ "$POST_UP_IP" = "0" ]; then
+  echo "Warning: IP address was lost after bringing interface up - MTK issue detected"
+  echo "Reapplying IP configuration..."
+  /system/bin/ip addr add $ETH_IP/$ETH_NETMASK broadcast $ETH_BROADCAST dev eth0
+  
+  # Check if reapplied configuration worked
+  FIXED_IP=$(/system/bin/ip addr show eth0 | grep -c "inet $ETH_IP")
+  echo "IP reapplication result: $FIXED_IP (1=success, 0=still missing)"
+  
+  # If standard method fails, try MTK-specific approaches
+  if [ "$FIXED_IP" = "0" ]; then
+    echo "Standard IP configuration failed, trying MTK-specific methods"
+    
+    # Try ifconfig if available (works better on some MTK devices)
+    if command -v ifconfig >/dev/null 2>&1; then
+      echo "Using ifconfig method..."
+      ifconfig eth0 $ETH_IP netmask 255.255.255.0 up
+      sleep 1
+    fi
     
-sleep 1
+    # Try Android's netd service if available
+    if [ -x "/system/bin/ndc" ]; then
+      echo "Using MTK netd service..."
+      /system/bin/ndc network interface setcfg eth0 $ETH_IP 255.255.255.0 up
+      sleep 1
+    fi
+  fi
+fi
 
 # Use loop to wait for interface UP instead of fixed sleep
 WAITED=0
 while [ $WAITED -lt $MAX_UP_WAIT ]; do
+  # Check both link status and IP configuration
   IF_STATUS=$(/system/bin/ip link show eth0 | grep -c ",UP")
-  if [ "$IF_STATUS" = "1" ]; then
+  IP_STATUS=$(/system/bin/ip addr show eth0 | grep -c "inet $ETH_IP")
-    echo "Interface is UP after $WAITED seconds"
+  
+  if [ "$IF_STATUS" = "1" ] && [ "$IP_STATUS" = "1" ]; then
+    echo "Interface is UP with correct IP after $WAITED seconds"
     break
   fi
-  echo "Waiting for interface UP... ($WAITED/$MAX_UP_WAIT)"
+  
+  echo "Waiting for interface UP with IP... ($WAITED/$MAX_UP_WAIT)"
+  
+  # If interface is UP but IP is missing, reapply IP
+  if [ "$IF_STATUS" = "1" ] && [ "$IP_STATUS" = "0" ]; then
+    echo "Interface UP but IP missing, reapplying IP..."
+    /system/bin/ip addr add $ETH_IP/$ETH_NETMASK broadcast $ETH_BROADCAST dev eth0
+  fi
+  
   sleep 0.5
   WAITED=$((WAITED+1))
 done
 
-if [ "$IF_STATUS" != "1" ]; then
+# Final status check
-  echo "Warning: Interface did not come UP within expected time, attempting to enable again" >&2
+FINAL_IF_STATUS=$(/system/bin/ip link show eth0 | grep -c ",UP")
-  /system/bin/ip link set eth0 up
+FINAL_IP_STATUS=$(/system/bin/ip addr show eth0 | grep -c "inet $ETH_IP")
-  sleep 1
+
+if [ "$FINAL_IF_STATUS" != "1" ] || [ "$FINAL_IP_STATUS" != "1" ]; then
+  echo "Warning: Failed to achieve stable interface state with IP" >&2
+  echo "Final interface status: $FINAL_IF_STATUS (1=UP, 0=DOWN)"
+  echo "Final IP status: $FINAL_IP_STATUS (1=configured, 0=missing)"
+  /system/bin/ip addr show eth0
+else
+  echo "Successfully configured eth0 with IP $ETH_IP"
 fi
 
 # First add to main routing table