I know in order to send data through a UDP socket using python has to be in the following format "\x41" = A .
I have a python script udp_send.py and I want to send in a hex value to represent a register value on the server side.
I run my script through linux terminal >>python udp_send.py "\x41" . I read the variable using argv in my python script. I did a len check and it is 3 . It ignore \ and take x, 4 and 1 as 1 byte each whereas I want \x41 to represent 1 byte only.
I was then trying to concatenate data="\x"+"41" but it did not work.
"\x" is interpreted as escape by python. I am trying to find a way to pass a hex value into my script and send it via UDP socket?
I have achieved the following so far. Send a hex value defined in python script via UDP socket .
from socket import * from sys import * ## Set the socket parameters host = <ip-define-here> port = <port-define-here> buf = 1024 addr = (host,port) ## Create socket UDPSock = socket(AF_INET,SOCK_DGRAM) ## Send messages data ='\x41' #data=argv #commented out if not data: print "No data" else: if(UDPSock.sendto(data,addr)): print "Sending message ",data ## Close socket UDPSock.close()
I used wireshark on server side and saw the hex value 41 appear.
Just to be clear "41"(made of 2 bytes) is not the same as "\x41"(one byte only) in python.
My simple question is, how can I take a character "41" and join it with "\x" to form "\x41" so I can assign it to data variable in my python script so I can send it as hex value 41.