def find_context_exact(self, dev_L2addr, dst_iid):
    ' find a context by both devL2Addr and dstIID.\n        This is mainly for internal use. '
    for c in self._db:
        if ((c['devL2Addr'] == dev_L2addr) and (c['dstIID'] == dst_iid)):
            return c
    return None
find a context by both devL2Addr and dstIID.
This is mainly for internal use.
def find_context_exact(self, dev_L2addr, dst_iid):
    ' find a context by both devL2Addr and dstIID.\n        This is mainly for internal use. '
    for c in self._db:
        if ((c['devL2Addr'] == dev_L2addr) and (c['dstIID'] == dst_iid)):
            return c
    return None