Raspberrypi5-simulink TCP/IP problem transfering data

Hi, i am trying to establish a TCP/IP communication between simulink model and my raspberry pi 5 board, i am able to connect them but when it's the time to receive data from simulink to raspberry pi i am not able to receive something, although the ip adress and port are correct, you find attached a part of the simulink model responsable of sending data to raspberrypi and u will find the code of receving data in raspberrypi

and this is my code:

import socket
import numpy as np

def process_data(received_data):
    a, b, c = [float(val) for val in received_data.split(',')]
    command = simulationat(a, b, c)
    return command
    
    def setup_server(host='0.0.0.0', port=25000):
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.bind((host, port))
    server_socket.listen(1)
    print(f"Listening on {host}:{port}")
    
    return server_socket
    
    def accept_connections(server_socket):
    while True:
        client_socket, addr = server_socket.accept()
        print(f"Connected by {addr}")
        
        try:
            while True:
                # Receiving data from client (Simulink)
                data = client_socket.recv(1024).decode().strip()
                if not data:
                    break
                    print(f"Received data: {data}")
                    
                    # Process the data
                    response_command = process_data(data)
                    
                    # Send the response command back to client (Simulink)
                    client_socket.sendall((response_command + '\n').encode())
                    
                    except ConnectionResetError:
                    print(f"Connection lost with {addr}")
                    finally:
                    client_socket.close()

 server_socket = setup_server(host='192.168.x.x', port=25000)
 accept_connections(server_socket)

Answer 1

[Shaunak]

Hi Nadjib,

It is my understanding that you are trying to troubleshoot the cause for the data not being processed even though it is not null. This may be caused by the misaligned code after the ‘break’ statement in the ‘accept_connections’ function which prevents any code you have written after it from being executed.

Here is the correct implementation of the ‘accept_connections’ function:

def accept_connections(server_socket):
    while True:
        client_socket, addr = server_socket.accept()
        print(f"Connected by {addr}")
        
        try:
            while True:
                # Receiving data from client (Simulink)
                data = client_socket.recv(1024).decode().strip()
                if not data:
                    break
                print(f"Received data: {data}")
                
                # Process the data
                response_command = process_data(data)
                
                # Send the response command back to client (Simulink)
                client_socket.sendall((response_command + '\n').encode())
        
        except ConnectionResetError:
            print(f"Connection lost with {addr}")
        
        finally:
            client_socket.close()

Hope this helps!