refactor conf file

Author: pavelrevak

README.md

@@ -55,32 +55,36 @@ pip uninstall ser2tcp
 ## Configuration file example
 
 ```json
-[
-    {
-        "serial": {
-            "port": "/dev/ttyUSB0",
-            "baudrate": 115200,
-            "parity": "NONE",
-            "stopbits": "ONE"
-        },
-        "servers": [
-            {
-                "address": "127.0.0.1",
-                "port": 10001,
-                "protocol": "tcp"
+{
+    "ports": [
+        {
+            "serial": {
+                "port": "/dev/ttyUSB0",
+                "baudrate": 115200,
+                "parity": "NONE",
+                "stopbits": "ONE"
             },
-            {
-                "address": "0.0.0.0",
-                "port": 10002,
-                "protocol": "telnet",
-                "send_timeout": 5.0,
-                "buffer_limit": 65536
-            }
-        ]
-    }
-]
+            "servers": [
+                {
+                    "address": "127.0.0.1",
+                    "port": 10001,
+                    "protocol": "tcp"
+                },
+                {
+                    "address": "0.0.0.0",
+                    "port": 10002,
+                    "protocol": "telnet",
+                    "send_timeout": 5.0,
+                    "buffer_limit": 65536
+                }
+            ]
+        }
+    ]
+}
 ```
 
+Legacy format (JSON array at root level) is still supported for backward compatibility.
+
 ### Serial configuration
 
 `serial` structure pass all parameters to [serial.Serial](https://pythonhosted.org/pyserial/pyserial_api.html#classes) constructor from pyserial library, this allows full control of the serial port.

ser2tcp.conf

@@ -76,12 +76,21 @@ def main():
     log = _logging.getLogger('ser2tcp')
     log.setLevel((30, 20, 10)[min(2, args.verbose)])
 
-    configuration = []
     with open(args.config, "r", encoding='utf-8') as config_file:
         configuration = _json.load(config_file)
 
+    if isinstance(configuration, list):
+        ports = configuration
+    elif isinstance(configuration, dict):
+        ports = configuration.get('ports', [])
+    else:
+        raise SystemExit("Invalid configuration format")
+
+    if not ports:
+        raise SystemExit("No ports configured")
+
     servers_manager = _server_manager.ServersManager()
-    for config in configuration:
+    for config in ports:
         servers_manager.add_server(_serial_proxy.SerialProxy(config, log))
 
     _signal.signal(_signal.SIGTERM, servers_manager.stop)