Can't make ProtoHeartbeatEvent work

Hi, this is my code for heartbeat event but i'm getting errors and not a response back. Can someone help me or show me a proper way to write the code please?
 

def sendProtoHeartbeatEvent():

     print('Sending heartbeat...')

     client = Client(host, EndPoints.PROTOBUF_PORT, TcpProtocol)

     request = ProtoHeartbeatEvent()

     deferred = client.send(request, responseTimeoutInSeconds=10)

     deferred.addErrback(onError)