IPv6 does not work with link-local addresses

[maspiess]

The IPv6 implementation does work with "::1" but not with link-local addresses. For this to work I have replaced some lines in the client:

def _connect(self):
    """Helper to establish socket communication"""

    ipv6 = type(ipaddress.ip_address(self._ecu_ip_address)) == ipaddress.IPv6Address

    self._tcp_sock = socket.socket(self._address_family, socket.SOCK_STREAM)
    self._tcp_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
    self._tcp_sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
    if self._client_ip_address is not None:
        if ipv6:
            ip_address, scope_id = self._client_ip_address.split("%")
            interface_index = socket.if_nametoindex(scope_id)
            self._tcp_sock.bind((ip_address, 0, 0, interface_index))
        else:
            self._tcp_sock.bind((self._client_ip_address, 0))

This works for me when called with a "...%..." address (same for UDP port), I'm not an expert on IPv6 though.