Thanks for your help,
It's my bad, I should put them to a list, not a array?
such as:
YY, 100, 140, 200, 110, 160?
Firstly, I'm confused about how to convert them to string and integers?
the raw bytes? Is it different to the bytes packing by "pack"? I want to
read them by a human way.
Besides, the MUC is made by my friend, we want to make an installation,
which can send data via UDP from a sensor. Maybe, we can change some
things in MUC? I don't know MUC totally. :( I just trying to learn Python.
Thanks
Yeh
-------- Original Message --------
Subject: Re: [Tutor] how to transform the data as below?
From: Peter Otten <__pete...@web.de>
To: tutor@python.org
CC:
Yeh wrote:
> Hi,
>
> I got messages from a MCU by using codes below:
>
> import socket
> import time
>
> port = 8888
> s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
> s.bind(("",port))
> print('waiting on port:', port)
> while True:
> data, addr = s.recvfrom(1024)
> print("DATA:", data, addr)
> time.sleep(100)
>
> The messages should be a head "YY" and 5 integers, (each integer is
> transferred by 2 bytes.) but I got data below. So, how to transform
the
> data? and how to arrange the data to a array?
>
> DATA:
> b'\t\x01x\x01\xfd\x02\x01\x02[YY\x01\t\x01x\x01...
> ('192.168.1.101', 35000)
What you read are the raw bytes. The array module offers one way to
convert
bytes to integers. Unfortunately the separator byte sequence b"YY" (or
b"XY"
followed by b"YZ") is also that for the integer 22873:
>>> array.array("H", b"YY")
array('H', [22873])
Therefore you cannot be 100% sure when you start the bytes-to-int
conversion
at the first occurence of b"YY". Here's an example that uses a simple
heuristics (which may fail!) to cope with the problem
import array, re
def find_start(data):
for m in re.compile(b"YY").finditer(data):
if all(
data[i:i+2] == b"YY"
for i in range(m.start(), len(data), 12)):
return m.start()
raise ValueError
data = b'\t\x01x\x01\xfd\x02\x01\x02[YY\x01\t...
if __name__ == "__main__":
start = find_start(data)
for i in range(start, len(data)-11, 12):
chunk = data[i:i+12]
print(chunk, "-->", list(array.array("H", chunk[2:])))
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