FiPy Wi-Fi Node-to-Node Socket Error (OSError: -1)

[Joseph]

Hello!

Apologies if someone has already posted this issue (or a similar one).

I'm attempting to connect two FiPy's directly (no router) through Wi-Fi with one of the Fipy's as the client, and the other as the access point. I've managed to get the client to connect to the access point. However, when I try to create a socket on the client side, I get OSError: -1.

Potential issues (based on Python documentation) and attempted solutions:

1. Memory issues. Updated the firmware to 1.17.5.b6.
2. Socket connection issues. Double checked IP and socket connection parameters. Please see below for the client code.

# This file is prototype source code for Wi-Fi master that establishes
# uni-directional communication (Master -> Slave) with Wi-Fi slave.

from network import WLAN
import socket
import pycom
import time

networkFound = Falseo
netSSID = None

pycom.heartbeat(False)
pycom.rgbled(0xff3333) # red
time.sleep(1)
print("Starting MASTER up!")

wlan = WLAN()
wlan.init(mode=WLAN.STA_AP, ssid="FiPy1_WiFi", auth=(WLAN.WPA2,"fipy1wifiprototype"), channel=11, antenna=WLAN.EXT_ANT)
# wlan.init(mode=WLAN.STA)
# network_found = False

while networkFound is False:
    print("Commencing scan!")
    nets = wlan.scan()
    print(nets)
    time.sleep(5)
    for net in nets:
        # Connect to Wi-Fi slave access point
        if net.ssid == "FiPy2_WiFi":
            # network_found = True
            print(net.ssid)
            time.sleep(1)
            networkFound = True
            wlan.connect(net.ssid, auth=(net.sec, "fipy2wifiprototype"), timeout=5000)
            netSSID = net.ssid
            pycom.rgbled(0x33ff33) # green
            time.sleep(1)
            # wlan.ifconfig(id=0)
            time.sleep(10)
            print(wlan.isconnected())
            time.sleep(1)
            break
        else:
            pycom.rgbled(0xff3333) # red
            time.sleep(1)
            print("NOT CONNECTED!")

# print (wlan.ifconfig())

try:
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    pycom.rgbled(1000) # blue
    time.sleep(1)
    print ("Socket successfully created!")
except socket.error as err:
    pycom.rgbled(0xff3333) # red
    time.sleep(1)
    print ("Socket failed to be created with error %s" %err)

print(netSSID)
time.sleep(2)
print(wlan.isconnected())
time.sleep(2)
# port = 12345
# host_ip = '192.168.4.1'
print(socket.getaddrinfo("192.168.4.1", 80))
time.sleep(2)
print(socket.getaddrinfo("192.168.4.1", 80)[0][-1])
time.sleep(2)
s.connect(socket.getaddrinfo("192.168.4.1", 80)[0][-1])
pycom.rgbled(0xffbb33) # orange
time.sleep(2)
print("The socket has successfully connected to your boy on port = %s" %(host_ip))

dataString = "Sent from FiPy1"
dataBytes = bytes(dataString, "utf-8")

# Send data as quickly as possible
for iteration in range(10):
    s.sendto(dataBytes, host_ip)
    pycom.rgbled(0x33ffdd) # green/blue hybrid
    print("Sent Data!")

print("End of program!")

# inputs = s.recv(1024)
# barray = binascii.hexlify(inputs)
# barray=barray.decode('utf-8')
# color = hex(int(barray,16) + int ("0x00",16))
# color = int(color)
# pycom.rgbled(color)

For reference, below is the access point code.

# This file is prototype source code for Wi-Fi slave that establishes
# uni-directional communication (Master -> Slave) with Wi-Fi master.

from network import WLAN
import socket
import pycom
import time

pycom.heartbeat(False)
pycom.rgbled(0xff3333) # red
time.sleep(1)
print("Starting SLAVE up!")

conn = None

# Configure access point
wlan = WLAN()
wlan.init(mode=WLAN.AP, ssid="FiPy2_WiFi", auth=(WLAN.WPA2, 'fipy2wifiprototype'), channel=11, antenna=WLAN.EXT_ANT)
# wlan.init(mode=WLAN.STA)

time.sleep(10)
wlan.ifconfig(id=1)
time.sleep(10)
print(wlan.isconnected())
time.sleep(1)

try:
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    pycom.rgbled(0x33ff33) # green
    time.sleep(1)
    print ("Socket successfully created!")
except socket.error as err:
    pycom.rgbled(0xff3333) # red
    time.sleep(1)
    print ("socket failed to be created with error %s" %err)

port = 12345
host_ip = ''
s.bind((host_ip,port))
s.listen()
pycom.rgbled(1000) # blue
time.sleep(1)
print("Listening for connection requests!")
time.sleep(1)

# Keep looping until connected.`
# 1. One socket for listening for connection requests.
# 2. One socket for actually receiving and sending data to client.
while conn is None:
    print("Reached!")
    conn, addr = s.accept()

pycom.rgbled(0xffbb33) # orange
time.sleep(1)

# Receive data from socket buffer
while True:
    data = conn.recv(256)
    data = data.decode("utf-8")
    pycom.rgbled(0x33ffdd) # green/blue hybrid
    time.sleep(1)
    print(data)

I'm somewhat baffled as I have been able to successfully connect to a router and create a socket on the client side.

Any insights or suggestions would be greatly appreciated.

Thank you!

[dan]

Hi @joseph,
No, not yet. I have spent a few days on it, but no progress. I keep getting Connection refused when trying to connect, so something must be wrong with my server code. Have you tried connecting it to a different device (e.g your computer)?

[Joseph]

Hi @dan,

Were you able to find anything more about the issue?

And if I may, could I ask you to test the on a pair of LoPy's? If the code works on the LoPy's, we'll probably purchase several LoPy's.

Thanks!

[dan]

Hi @Joseph,

I'm looking into it, it indeed doesn't work. I was able to get a more "descriptive" error OSError: [Errno 104] ECONNRESET by adding try-except to s.connect(...). I'll get back to you when I have more info.