Add explicit ping/pong message handling to Python implementations

- Implement ping/pong event handlers in wsscp.py and wsssh.py
- Register ping_handler and pong_handler functions for WebSocket connections
- Enable debug logging for ping/pong events when debug mode is enabled
- Maintain automatic pong responses via websockets library while adding explicit handling

wsscp.py

@@ -101,6 +101,16 @@ async def run_scp(server_ip, server_port, client_id, local_port, scp_args):
 
     try:
         async with websockets.connect(uri, ssl=ssl_context) as websocket:
+            # Set up ping/pong handlers for explicit handling
+            async def ping_handler(payload):
+                if debug: print(f"[DEBUG] Received ping: {payload}")
+                # Pong is sent automatically by websockets library
+
+            async def pong_handler(payload):
+                if debug: print(f"[DEBUG] Received pong: {payload}")
+
+            websocket.ping_handler = ping_handler
+            websocket.pong_handler = pong_handler
             # Request tunnel
             await websocket.send(json.dumps({
                 "type": "tunnel_request",

wsssh.py

@@ -101,6 +101,16 @@ async def run_ssh(server_ip, server_port, client_id, local_port, ssh_args):
 
     try:
         async with websockets.connect(uri, ssl=ssl_context) as websocket:
+            # Set up ping/pong handlers for explicit handling
+            async def ping_handler(payload):
+                if debug: print(f"[DEBUG] Received ping: {payload}")
+                # Pong is sent automatically by websockets library
+
+            async def pong_handler(payload):
+                if debug: print(f"[DEBUG] Received pong: {payload}")
+
+            websocket.ping_handler = ping_handler
+            websocket.pong_handler = pong_handler
             # Request tunnel
             await websocket.send(json.dumps({
                 "type": "tunnel_request",