Good again. I return to post, because I would need the LoPy that receives the txt file is the one that starts the wifi as wlan = WLAN (mode = WLAN.AP, ssid = 'Gateway1', auth = (WLAN.WPA2, 'password'), antenna = WLAN.INT_ANT) I have tried to modify the code as I have the partner that works so that it is but I get error everywhere. Once trying once more, if I do not restart the board and try to execute the code, I always get the error: Traceback (most recent call last): File "<stdin>", line 17, in <module> OSError: [Errno 12] ENOMEM Because it is ? If someone can give me a hand code please! Capture Errors: used code: Server And Wifi AP: from network import WLAN import socket import select import time #Setup WiFi AP wlan = WLAN(mode=WLAN.AP, ssid='Gateway1', auth=(WLAN.WPA2,'password'), antenna=WLAN.INT_ANT) port = 12345 s = socket.socket() s.bind(socket.getaddrinfo("0.0.0.0", port)[0][4]) s.listen(1) print("Running server") while True: cl, remote_addr = s.accept() cl.setblocking(True) print("Client connection from:", remote_addr) file = "/flash/registro2.txt" with open(file, 'wb') as f: try: data = s.recv(1024) print(data) f.write(data) except TimeoutError: break Client and Lopy and in charge to send file: from network import WLAN import socket import select import machine import time # Abrimos wifi wlan = WLAN(mode=WLAN.STA) nets = wlan.scan() for net in nets: if net.ssid == 'Gateway1': print('Network found!') wlan.connect(net.ssid, auth=(net.sec, 'password'), timeout=5000) while not wlan.isconnected(): machine.idle() # save power while waiting print('WLAN connection succeeded!') break else: raise Exception("WiFi network not found") # sleep just to make sure the wifi is connected time.sleep(1) ip, subnet, gateway, dns = wlan.ifconfig() # Connect to server # Bind to the port port = 12345 s = socket.socket() s.connect((gateway, port)) s.setblocking(True) s.settimeout(2) while True: readable, writable, errored = select.select([s], [], []) for s in readable: cl, remote_addr = s.accept() cl.setblocking(True) print("Client connection from:", remote_addr) file = "/flash/registro.txt" print("Sending: ", file) with open(file, 'rb') as f: data = f.read(1024) while(data): print("sending", data) cl.sendall(data) data = f.read(1024) print("Done Sending") cl.close()