modbus_tcp_b.py 文件源码

def set_keepalive(self,_sock, after_idle_sec=5, interval_sec=3, max_fails=60):
        """Set TCP keepalive on an open socket.--new add

        It activates after 1 second (after_idle_sec) of idleness,
        then sends a keepalive ping once every 3 seconds (interval_sec),
        and closes the connection after 60 failed ping (max_fails), or 180 seconds
        """
        _sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
        _sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, after_idle_sec)
        _sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, interval_sec)
        _sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, max_fails)