Raspberry Pi (Debian) 上的 Twisted Python 脚本通过 USB 与 Arduino 通信

The code below runs on the RPi, receives a GET request and passes some of that data through the serial port to the Arduino. I cannot seem to get this code to listen to that same serial port though. :/ I have been working on this for a bit over a month and seem to be stuck. I just cannot seem to find a good example for Twisted Python online to receive serial data; or at least an example that I understand. Anyway here is what I have so far:

import sys
from urlparse import urlparse
from twisted.web import server, resource
from twisted.internet import reactor
from twisted.internet.protocol import Factory, Protocol
from twisted.internet.serialport import SerialPort

serServ = None

class USBclient(Protocol):
    def connectionMade(self):
        global serServ
        serServ = self
        print 'Arduino device: ', serServ, ' is connected.'

    def cmdReceived(self, cmd):
        serServ.transport.write(cmd)
        print cmd, ' - sent to Arduino.'
        pass

    def serialReadEvent(self):      #maybe it should be: doRead()? Couldn't get either to work.
        print 'data from arduino is at the serial port!'

class HTTPserver(resource.Resource):
    isLeaf = True
    def render_GET(self, request):      #passes the data from the get request
        print 'HTTP request received'
        myArduino = USBclient()
        stringit = str(request)
        parse = stringit.split()
        command, path, version = parse
        myArduino.cmdReceived(path)

class cmdTransport(Protocol):
    def __init__(self, factory):
        self.factory = factory

class cmdTransportFactory(Factory):
    protocol = cmdTransport

if __name__ == '__main__':
    HTTPsetup = server.Site(HTTPserver())
    reactor.listenTCP(5000, HTTPsetup)
    SerialPort(USBclient(), '/dev/ttyACM0', reactor, baudrate='115200')
    reactor.run()

正如您所见，代码只是在串行端口上寻找任何东西，但我似乎无法让这种魔法发生.提前致谢，感谢您的帮助！

class USBclient(Protocol):
    def connectionMade(self):
        global serServ
        serServ = self
        print 'Arduino device: ', serServ, ' is connected.'

    def cmdReceived(self, cmd):
        serServ.transport.write(cmd)
        print cmd, ' - sent to Arduino.'
        pass

    def dataReceived(self,data):      
        print 'USBclient.dataReceived called with:'
        print str(data)