Data transmission issue over TCP IP socket between python device and Matlab
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Cosimo Mercuro on 19 Feb 2021
Commented: Shadaab Siddiqie on 23 Feb 2021
I can transit data between a Raspberry with python 3.7 installed and a PC with Matlab (192.168.1.40) , last release, installed by means a TCP IP Socket and configuring the Matlab PC as server and the pyhton device as client.
Here is the Pyhton client code:
#----- A simple TCP client program in Python using send() function -----
# Create a client socket
clientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# Connect to the server
# Send data to server
data = "HHH"
and this is the Matlab server code:
t = tcpip('0.0.0.0', 9090, 'NetworkRole', 'server')
data = fread(t)
For testing purpose I've attempted to transmit only few characters : HHH
The issue is that the transmission works but the other end (on the Matlab side) instead of the right characters (HHH) I see only their ASCII code (72, 72, 72).
If I do the same between two instances of Rasberry python (using a decode() method), I see correctly the data tranmitted over the socket.
Thanks in advance
Shadaab Siddiqie on 22 Feb 2021
From my understanding you want to know why fread returns ASCII code instead of string. This is because tcpip writes data in Unicode format thus you are using fread (which reads data form binary file). To change unicode to string use char:
u = [77 65 84 76 65 66];
c = char(u)
-> c = 'MATLAB'
Also since tcpip and its object properties will be removed. Use tcpclient and its properties instead.
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