OSError: [Errno 98] EADDRINUSE

[andreasr81]

Hi, i am a beginner, and done the code on https://projects.raspberrypi.org/en/projects/get-started-pico-w/5

at first all went fine, then i get this error and dont no why?!

error

Traceback (most recent call last):
File "", line 35, in
File "", line 29, in open_socket
OSError: [Errno 98] EADDRINUSE

error

code

import network
import socket
from time import sleep
from picozero import pico_temp_sensor, pico_led
import machine

ssid = 'OpenWrt'
password = '**********'

def connect():
#Connect to WLAN
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(ssid, password)
while wlan.isconnected() == False:
print('Waiting for connection...')
sleep(1)
ip = wlan.ifconfig()[0]
print(f'Connected on {ip}')
return ip

def open_socket(ip):
# Open a socket
address = (ip, 80)
connection = socket.socket()
connection.bind(address)
connection.listen(1)
return connection

try:
ip = connect()
open_socket(ip)
except KeyboardInterrupt:
machine.reset()

end

[davefes]

connection.sockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
The keyword is REUSEADDR

[SlowFeather]

AttributeError: 'socket' object has no attribute 'sockopt'
He will trigger this error
connection.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
This is available on Pico w

[andreasr81]

thanks for the answer, i find the solution in the meantime, it was connection.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) nearly the same as your solution.

[HardwaterAK]

hello, I am having the same issue. could share were in the code you insert connection.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

[davefes]

This was in a server application:

        if (sta_if.isconnected()):
            try:
                s = usocket.socket()

             #  allow for immediate re-use
                s.setsockopt(usocket.SOL_SOCKET, usocket.SO_REUSEADDR, 1)

                s.bind((config.host, config.port))
                s.settimeout(60)
                s.listen(0)

                print('listening for 60 seconds')
                ......             

[DGSArchos]

Hi ! I have this issue too. I didn't understand where you put those lines in the code.

[hwsacuity]

Answer ! of this link https://stackoverflow.com/questions/6380057/address-already-in-use-error-when-binding-a-socket-in-python Worked but not sure if setting the port to 0 is a good idea in the address, but it let me run a test adding connection.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) alone was still gave OSError: [Errno 98] EADDRINUSE when address = (ip, 80) is in the code.
def open_socket(ip):
#Open a socket
address = (ip, 0)
connection = socket.socket()
connection.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
connection.bind(address)
connection.listen(1)
print(connection)

[mattyrjackson]

Also had same issue and resolved it with port 0.
I'd be interested to know a bit more about why port 80 was temperamental yet port 0 worked first time.