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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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