i am trying to establish a TCP connection between a pc as server and the esp32 as client (bidirectional messaging).I can establish a TCP connection, the issue appears at the moment of send a message from the ESP32 to the server, the server receives the proper message but then arrives a lot of undesirable data (seems to be just null characters).
I was thinking that maybe this problem is related to the output buffer, but i could not solve the problem jet.
I let you the code of the client and server and also the resulting problem.
The desired behaviour on the TCP server side is this:
192.168.2.104
[*] Started listening on 192.168.2.104 : 1234
Received connection: 192.168.2.112
[*] Started listening on 192.168.2.104 : 1234
[*] Received ' b'Hello server' 192.168.2.112 ' from the client
Processing done.
[*] Reply sent
But then start to print a lot of this lines over and over again:
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
NOTE: The server was programed in python and was already tested against other PC's.
Can you help me to figure out what is going wrong? Thanks
Source Code TCP CLient ESP32
Code: Select all
#include <WiFi.h>
void setup()
{
Serial.begin(115200);
delay(10);
const char* ssid = "xxxx";
const char* password = "yyyy";
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
// We start by connecting to a WiFi network
WiFi.begin(ssid, password);
while(WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
delay(500);
const uint16_t port = 1234;
const char * host = "192.168.2.104"; // ip or dns
Serial.print("connecting to ");
Serial.println(host);
// Use WiFiClient class to create TCP connections
WiFiClient client;
if (!client.connect(host, port)) {
Serial.println("connection failed");
Serial.println("wait 5 sec...");
delay(5000);
return;
}
client.print("Hello server");
delay(5000);
String line = client.readStringUntil('\r');
Serial.println(line);
delay(5000);
client.stop();
delay(5000);
}
void loop(){}---------------------------------------------------------------------------------------------------------------------------------------------------------------
Source Code TCP Server PC (python)
Code: Select all
import socket
import threading
class ClientThread(threading.Thread):
def __init__(self, client, details):
self.client = client
self.details = details
threading.Thread.__init__ ( self )
def run(self):
print('Received connection:', self.details[0])
while True:
data = self.client.recv(1024)
client_details = self.details[0]
print("[*] Received '", data, client_details,
"' from the client")
strhello = "Hello server"
strdisconnect = "disconnect"
if data == strhello.encode('utf-8'):
server_reply = 'Hello client'
self.client.sendall(
server_reply.encode('utf-8'))
print("Processing done.\n[*] Reply sent")
elif data == strdisconnect.encode('utf-8'):
server_reply = 'Goodbye'
self.client.sendall(
server_reply.encode('utf-8'))
self.client.close()
print('Closed connection:',
self.details[0])
break
else:
server_reply = 'Invalid data'
self.client.sendall(
server_reply.encode('utf-8'))
print("Processing done Invalid data.\n[*] "
"Reply sent")
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
ip = socket.gethostbyname(socket.gethostname())
print (ip)
port = 1234
address = (ip,port)
server.bind(address)
server.listen(5)
while True:
print("[*] Started listening on ", ip, ":", port)
client, details = server.accept()
ClientThread(client, details).start()
ESP32 results
Connecting to M&M_Wi-Fi
.............
WiFi connected
IP address:
192.168.2.112
connecting to 192.168.2.104
Hello client
----------------------------------------------------------------------------------------------------------------------------------------------------------------
PC results
192.168.2.104
[*] Started listening on 192.168.2.104 : 1234
Received connection: 192.168.2.112
[*] Started listening on 192.168.2.104 : 1234
[*] Received ' b'Hello server' 192.168.2.112 ' from the client
Processing done.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Processing done Invalid data.
[*] Reply sent
[*] Received ' b'' 192.168.2.112 ' from the client
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\Hause\AppData\Local\Programs\Python\Python36-32\lib\threading.py", line 916, in _bootstrap_inner
self.run()
File "F:/BeagleBone Black/Python_Projects/Py_TCP_Server_v2/Py_TCP_Server_v2.py", line 41, in run
server_reply.encode('utf-8'))
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine