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def frame_read(fd,head,tail,timeout):
    'return -- donot recv data return None,recv data but wrong format return [],else return data in tupe format, \
            frame_len -- each frame cmd len,'
    if fd is None or len <= 0:
        print 'fd is None or len <= 0,'
        return None
    fd_type = check_obj_type(fd)
#    print 'connect obj type is %s' % fd_type
    if fd_type == 'invalid_type':
        return None
    cur_time = time.time()
    data = ''
    lines = []
    received = False
    head_found = False
    head_len = len(head)
    tail_len = len(tail)
    temp = None
    frame_len = 512
    hex_str = ''
    while 1:
        if is_timeout(cur_time,timeout):
            print 'wait data timeout.'
            if not received:
                return None
            else:               
      


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