Send Hexadecimal string to socket using python [duplicate]

Question

Dear friends this is a humble request to solve my problem with example please. I am working on RFID sensors in which i need to send Hexadecimal data to socket. here is my code

import socket

HOST = '192.168.0.115' 
PORT = 20108
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
DATA = 'A5 5A 00 08 04 0C 0D 0A'
s.send(DATA)
data = s.recv(4096)
s.close()
d = data.encode('hex').upper()
print 'Received', repr(d)

this code is sending DATA in string format but i need to send the DATA in Hexadecimal format because the RFID reader can read Hexadecimal data... i already use struct.pack but it is not working for me or may be I don't know how to use it... the DATA is same "A5 5A 00 08 04 0C 0D 0A" this but how do i send this in Hexadecimal format... for example if sock.send("") sending string. in need to send socket.send(hexadecimal)???

Looks like you mean a binary pattern, in which case struct,pack() is the way to go. Show what you have done for struct.pack. You probably want to split the DATA into a list and convert the values to ints. — cdarke
– cdarke, Commented Apr 10, 2015 at 5:46

Community · Accepted Answer · 2017-05-23 11:57:03Z

0

Think this has already been answered Pyhton Send receive hex data via tcp socket

You may want to convert your text first into hex format for RFID to understand:

'01AF23'.decode('hex')

edited May 23, 2017 at 11:57

CommunityBot

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answered Apr 10, 2015 at 5:57

Dadi Hrolfsson

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1 Comment

barshopen Over a year ago

This solution doens't work. you'll get : AttributeError: 'str' object has no attribute 'decode'

pygeek · Accepted Answer · 2015-04-10 06:02:09Z

0

Python has a built in hexadecimal type. You will need to serialize that as a string before sending it; as socket.send only accepts strings.

Edit: After re-reading your question, it seems you aren't encoding the received value as a hex type. With that said, if you choose to serialize your data before sending it, you just unserialize it on the receiving end.

References:

See Python serialization: https://docs.python.org/2/library/pickle.html

See Python Hex type: https://docs.python.org/2/library/functions.html#hex

edited Apr 10, 2015 at 6:02

answered Apr 10, 2015 at 5:53

pygeek

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