[bug#4062] Added usage of SO_KEEPALIVE flag on sjrpc sockets.

sjrpc/core/rpcconnection.py

@@ -32,6 +32,9 @@ class RpcConnection(object):
     def __init__(self, sock, manager, handler=None, timeout=None):
         # Sock of this connection:
         self._sock = sock
+
+        # Activate TCP keepalive on the connection:
+        self._sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
         
         # Inbound buffer containing currently readed message while it sending:
         self._inbound_buffer = BytesBuffer()