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#!/usr/bin/env python
#(C)2002-2003 Chris Liechti <cliechti@gmx.net>
#redirect data from a TCP/IP connection to a serial port and vice versa
#requires Python 2.2 'cause socket.sendall is used
"""USAGE: tcp_serial_redirect.py [options]
Simple Serial to Network (TCP/IP) redirector.
Options:
-p, --port=PORT serial port, a number, defualt = 0 or a device name
-b, --baud=BAUD baudrate, default 9600
-r, --rtscts enable RTS/CTS flow control (default off)
-x, --xonxoff enable software flow control (default off)
-P, --localport TCP/IP port on which to run the server (default 7777)
Note: no security measures are implemeted. Anyone can remotely connect
to this service over the network.
Only one connection at once is supported. If the connection is terminaed
it waits for the next connect.
"""
import sys, os, serial, threading, getopt, socket
try:
True
except NameError:
True = 1
False = 0
class Redirector:
def __init__(self, serial, socket):
self.serial = serial
self.socket = socket
def shortcut(self):
"""connect the serial port to the tcp port by copying everything
from one side to the other"""
self.alive = True
self.thread_read = threading.Thread(target=self.reader)
self.thread_read.setDaemon(1)
self.thread_read.start()
self.writer()
def reader(self):
"""loop forever and copy serial->socket"""
while self.alive:
try:
data = self.serial.read(1) #read one, blocking
n = self.serial.inWaiting() #look if there is more
if n:
data = data + self.serial.read(n) #and get as much as possible
if data:
self.socket.sendall(data) #send it over TCP
except socket.error, msg:
print msg
#probably got disconnected
break
self.alive = False
def writer(self):
"""loop forever and copy socket->serial"""
while self.alive:
try:
data = self.socket.recv(1024)
if not data:
break
self.serial.write(data) #get a bunch of bytes and send them
except socket.error, msg:
print msg
#probably got disconnected
break
self.alive = False
self.thread_read.join()
def stop(self):
"""Stop copying"""
if self.alive:
self.alive = False
self.thread_read.join()
if __name__ == '__main__':
ser = serial.Serial()
#parse command line options
try:
opts, args = getopt.getopt(sys.argv[1:],
"hp:b:rxP",
["help", "port=", "baud=", "rtscts", "xonxoff", "localport"])
except getopt.GetoptError:
# print help information and exit:
print >>sys.stderr, __doc__
sys.exit(2)
ser.port = 0
ser.baudrate = 9600
ser.rtscts = False
ser.xonxoff = False
ser.timeout = 1 #required so that the reader thread can exit
localport = 7777
for o, a in opts:
if o in ("-h", "--help"): #help text
usage()
sys.exit()
elif o in ("-p", "--port"): #specified port
try:
ser.port = int(a)
except ValueError:
ser.port = a
elif o in ("-b", "--baud"): #specified baudrate
try:
ser.baudrate = int(a)
except ValueError:
raise ValueError, "Baudrate must be a integer number"
elif o in ("-r", "--rtscts"):
ser.rtscts = True
elif o in ("-x", "--xonxoff"):
ser.xonxoff = True
elif o in ("-P", "--localport"):
try:
localport = int(a)
except ValueError:
raise ValueError, "Local port must be an integer number"
print "--- TCP/IP to Serial redirector --- type Ctrl-C / BREAK to quit"
try:
ser.open()
except serial.SerialException, e:
print "Could not open serial port %s: %s" % (ser.portstr, e)
sys.exit(1)
srv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
srv.bind( ('', localport) )
srv.listen(1)
while 1:
try:
print "Waiting for connection..."
connection, addr = srv.accept()
print 'Connected by', addr
#enter console->serial loop
r = Redirector(ser, connection)
r.shortcut()
print 'Disconnected'
connection.close()
except socket.error, msg:
print msg
print "\n--- exit ---"
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