openmv/usr/examples/echo_server.py
2014-10-10 04:12:14 +02:00

71 lines
1.6 KiB
Python

'''
Simple echo server
'''
import wlan
import socket
import select
import led, time
SSID='' # Network SSID
KEY='' # Network key
HOST = '' # Use first available interface
PORT = 8000 # Arbitrary non-privileged port
led.off(led.RED)
led.off(led.BLUE)
led.on(led.GREEN)
# Init wlan module and connect to network
wlan.init()
wlan.connect(SSID, sec=wlan.WPA2, key=KEY)
led.off(led.GREEN)
# Wait for connection to be established
while (True):
led.toggle(led.BLUE)
time.sleep(250)
led.toggle(led.BLUE)
time.sleep(250)
if wlan.connected():
led.on(led.BLUE)
break;
# We should have a valid IP now via DHCP
wlan.ifconfig()
# Create server socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
# Set socket in blocking mode
s.setblocking(True)
# Bind and listen
s.bind((HOST, PORT))
s.listen(5)
while(True):
print ('Waiting for connections..')
client, addr = s.accept()
print ('Connected to ' + addr[0] + ':' + str(addr[1]))
# Set client socket non-blocking
client.setblocking(False)
while (True):
rfds, wfds, xfds = select.select([client], [], [client], 1.0)
if xfds:
print("socket exception")
break
elif rfds:
buf = client.recv(1024)
if len(buf) == 0: # peer has shutdown
print("socket closed")
client.close()
break
print ("recv:"+str(buf))
client.send(buf)
elif wfds:
print ("wfds")
else:
print ("timeout")