Question

目标是使用websocket将串行“有效负载”发送到非本地服务器（静态IP），并在每次从连接到本地计算机的串行设备（运行此代码）的新串行数据时触发。以下代码确实接收串行数据......并且它使用远程服务器创建websocket。我无法从SerialDevice类触发sendmessage，因为当我取消注释SerialDevice类中的行“BroadcastClientProtocol（）。sendPayload（payload）”

这是未处理的错误： [...] if self.state！= WebSocketProtocol.STATE_OPEN： exceptions.AttributeError：BroadcastClientProtocol实例没有属性'state'

在SerialDevice Class中，我可以调用一个测试继承的方法BroadcastClientProtocol（）。testInheritanceMethod（）。

以下是改编自autobahn websocket / broadcast client.py

的代码

from twisted.internet import reactor
from autobahn.twisted.websocket import WebSocketClientFactory, \
                                       WebSocketClientProtocol, \
                                       connectWS
from twisted.internet.serialport import SerialPort
from twisted.protocols.basic import LineReceiver

COM_PORT='/dev/ttyUSB0'
BAUD_RATE=115200

import sys
from twisted.internet import reactor
from autobahn.twisted.websocket import WebSocketClientFactory, \
                                       WebSocketClientProtocol, \
                                       connectWS
from twisted.internet.serialport import SerialPort
from twisted.protocols.basic import LineReceiver

COM_PORT='/dev/ttyUSB0'
BAUD_RATE=115200

class SerialDevice(LineReceiver):
     def __init__(self, network):
         pass

     def lineReceived(self, payload):
         print "receive:", payload
         #the call to the inherited method testInheritanceMethod() works
         BroadcastClientProtocol().testInheritanceMethod()

         #the call to the inherited method sendPayload() fails
         #BroadcastClientProtocol().sendPayload(payload)

class BroadcastClientProtocol(WebSocketClientProtocol):
   """
   Simple client that connects to a WebSocket server, send a HELLO
   message every 2 seconds and print everything it receives.
   """
   def testInheritanceMethod(self):
      print("inherited method called OK")

   def sendHello(self):
      self.sendMessage("Hello from Python!".encode('utf8'))
      reactor.callLater(2, self.sendHello)

   def sendPayload(self, data):
      self.sendMessage(data.encode('utf8'))

   def onOpen(self):
      self.sendHello()

   def onMessage(self, payload, isBinary):
      if not isBinary:
         print("Text message received: {}".format(payload.decode('utf8')))


if __name__ == '__main__':

   if len(sys.argv) < 2:
      print("Need the WebSocket server address, i.e. ws://localhost:9000")
      sys.exit(1)

   factory = WebSocketClientFactory(sys.argv[1])
   factory.protocol = BroadcastClientProtocol
   connectWS(factory)
   SerialPort(SerialDevice(BroadcastClientProtocol), COM_PORT, reactor, baudrate=BAUD_RATE)

   reactor.run()

twisted autobahn websocket：用于SerialPort的类不能继承用于触发sendMessage的类方法

0 个答案: