Update app.py

app.py

@@ -1,6 +1,31 @@
-import os
-import subprocess
-
-# 启动 Node-RED
+import os 
+import subprocess 
+import sys 
+import time 
+ 
+def check_port_available(port):
+    """检查端口是否被占用"""
+    import socket 
+    try:
+        with socket.socket(socket.AF_INET,  socket.SOCK_STREAM) as s:
+            s.bind(("0.0.0.0",  port))
+        return True 
+    except OSError:
+        return False 
+ 
+def start_node_red():
+    # 设置 Node-RED 的用户目录 
+    user_dir = "/usr/src/node-red"
+    
+    # 检查端口是否可用 
+    port = 1880 
+    if not check_port_available(port):
+        print(f"Port {port} is already in use. Exiting...")
+        sys.exit(1) 
+    
+    # 启动 Node-RED 
+    print("Starting Node-RED...")
+    subprocess.run(["node-red",  "--userDir", user_dir])
+ 
 if __name__ == "__main__":
-    subprocess.run(["node-red", "--userDir", "/usr/src/node-red"])
+    start_node_red()