I am currently trying to learn networking with python. I am really new to this topic so I replicated some examples from somewhere like here
I want to achieve a continous data transfer with TCP. This means I want to send data as long as some condition is met. So I slightly modified the example to this code below:
My Setup is Win10 with Python 3.8
My client.py copied and modified form above:
# Echo client program
import socket
HOST = '192.168.102.127' # The remote host
PORT = 21
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
i=0 #For counting how often the string was sent
while True: #for testing this is forever
s.sendall(b'Hello, world')
data = s.recv(1024)#
print(i)
i=i+1
print('Received', repr(data))
My server.py:
# Echo server program
import socket
HOST = '' # Symbolic name meaning all available interfaces
PORT = 21
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((HOST, PORT))
s.listen(1)
conn, addr = s.accept()
with conn:
print('Connected by', addr)
while True:
data = conn.recv(1024)
if not data: break
conn.sendall(data)
The error I am getting is
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine
after i=5460 (in multiple tries) on the Client side and
ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host on the Server side
The longer my text message is, less messages got sent before the error.
This leads me to believe I sent the data to some sort of buffer which is (over-)written to until the error is thrown. When looking for possible solutions I only found different implementations, which did not cover my problem or used other software.
As stated in some answers for similar questions, I disabled my firewall and stopped my antivirus, but with no noticable difference. When looking up the error, there is also the possibilty of protocol errors but I do not expect that to be a problem. When reading into the socket/TCP documentation, I found somewhere that TCP is not really designed for this kind of problem, but rather for
client connects to server
|
V
client sends request to server
|
V
server sends request answer
|
V
server closes connection.
Is this really true? But I cannot believe that for every data that is sent a new socket must be connected, like in this question. This solution is also really slow. But if this is the case, what could I use alternatively?
To illustrate the bigger picture:
I have a some other code which is giving me status data (text) at 500Hz. In Python, I am processing this data and sending the processed data to an Arduino with Ethernet shield. This data is "realtime" data, so I need the data sent to the arduino as fast as possible. Here the client is Python and the Server is the Arduino with the Ethernet module. The connection and everthing is working fine, only the continous sending of data is my problem.
