Problems using viznet.client.connect

[farshizzo]

Hi,

A couple things to note:

• viznet currently uses UDP sockets for communication, not TCP. So there is no actual connection taking place. As long as the server address exists, it will report a successful "connection".
• Network message events are triggered during the main update loop, not asynchronously. So if you are blocking the main thread, then you won't be receiving any network events.

I'd recommend looking into the Python Twisted library. It supports much more advanced networking features.

However, you can perform a blocking handshake by manually updating the network events in a while loop. Here is a minimal example:

Server code:

import viz
import viznet
viz.go()

HANDSHAKE = viznet.id('ConnectHandshake')

viznet.server.start()

# Perform handshake with clients
def onStartClient(e):
	viznet.server.sendClient(e.sender,HANDSHAKE)
viz.callback(viznet.CLIENT_CONNECT_EVENT,onStartClient)

Client code:

import viz
import viznet
import vizact
viz.go()

SERVER = 'MASTER'

HANDSHAKE = viznet.id('ConnectHandshake')

def ConnectServer(server,timeout=2.0):
	d = viz.Data(connected=False)
	if viznet.client.connect(server):
		def _handshake(e):
			d.connected = True
		cb = vizact.addCallback(HANDSHAKE,_handshake)
		expire = viz.tick() + timeout
		while not d.connected and viz.tick() < expire:
			viz.waitTime(0.1)
			viz.update(viz.UPDATE_NETWORK)
		cb.remove()
	return d.connected

if ConnectServer(SERVER):
	print 'Connected'
else:
	print 'Not Connected'

Hope that is helpful.