run.py

from layer import EchoLayer
from yowsup.layers                             import YowParallelLayer
from yowsup.layers.auth                        import YowAuthenticationProtocolLayer
from yowsup.layers.protocol_messages           import YowMessagesProtocolLayer
from yowsup.layers.protocol_receipts           import YowReceiptProtocolLayer
from yowsup.layers.protocol_acks               import YowAckProtocolLayer
from yowsup.layers.network                     import YowNetworkLayer
from yowsup.layers.coder                       import YowCoderLayer
from yowsup.stacks import YowStack
from yowsup.common import YowConstants
from yowsup.layers import YowLayerEvent
from yowsup.stacks import YowStack, YOWSUP_CORE_LAYERS
from yowsup.layers.axolotl                     import YowAxolotlLayer
from yowsup.env import YowsupEnv


CREDENTIALS = ("ccxxxxxxxxxxxxxxxx", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx") # replace with your phone and password

def start_server():
    layers = (
        EchoLayer,
        YowParallelLayer([YowAuthenticationProtocolLayer, YowMessagesProtocolLayer, YowReceiptProtocolLayer, YowAckProtocolLayer]),YowAxolotlLayer
    ) + YOWSUP_CORE_LAYERS

    stack = YowStack(layers)
    stack.setProp(YowAuthenticationProtocolLayer.PROP_CREDENTIALS, CREDENTIALS)         #setting credentials
    stack.setProp(YowNetworkLayer.PROP_ENDPOINT, YowConstants.ENDPOINTS[0])    #whatsapp server address
    stack.setProp(YowCoderLayer.PROP_DOMAIN, YowConstants.DOMAIN)
    stack.setProp(YowCoderLayer.PROP_RESOURCE, YowsupEnv.getCurrent().getResource())          #info about us as WhatsApp client

    stack.broadcastEvent(YowLayerEvent(YowNetworkLayer.EVENT_STATE_CONNECT))   #sending the connect signal

    stack.loop()