[Twisted-Python] How to run function from protocol class

[Michał Tyde]

I got the code:
from twisted.internet.protocol import Protocol

class MyClientProtocol(Protocol):
	buffer = ''
	def connectionMade(self):
		self.transport.write('hello world')
	def myFunction(self):
		self.transport.write('blah')
	def dataReceived(self, data):
		self.buffer += data
		if self.buffer == 'hello world':
			self.transport.loseConnection()
from twisted.internet.protocol import ClientFactory

class MyFactory(ClientFactory):
	protocol = MyClientProtocol
	def startedConnecting(self, connector):
		pass # we could connector.stopConnecting()
	def clientConnectionLost(self, connector, reason):
		connector.connect() # reconnect
	def clientConnectionFailed(self, connector, reason):
		print "connection failed"
		reactor.stop()

from twisted.internet import reactor, task

#t=MyClientProtocol()
#l = task.LoopingCall(t.myFunction)
#l.start(5.0)

reactor.connectTCP('localhost', 7771, MyFactory(), timeout=30)
reactor.run()

I want to run my function myFunction every 5 sec (commented code). I want to use a task.LoopingCall loop. 
I am run out of new ideas. I don't know how to do this. Help please.