import unittest
import settings

import time
import mosquitto

import serial

def on_message(mosq, obj, msg):
  obj.message_queue.append(msg)

class mqtt_basic(unittest.TestCase):
  
  message_queue = []
  
  @classmethod
  def setUpClass(self):
    self.client = mosquitto.Mosquitto("pubsubclient_ut", clean_session=True,obj=self)
    self.client.connect(settings.server_ip)
    self.client.on_message = on_message
    self.client.subscribe("outTopic",0)

  @classmethod
  def tearDownClass(self):
    self.client.disconnect()
  
  def test_one(self):
    i=30
    while len(self.message_queue) == 0 and i > 0:
      self.client.loop()
      time.sleep(0.5)
      i -= 1
    self.assertTrue(i>0, "message receive timed-out")
    self.assertEqual(len(self.message_queue), 1, "unexpected number of messages received")
    msg = self.message_queue[0]
    self.assertEqual(msg.mid,0,"message id not 0")
    self.assertEqual(msg.topic,"outTopic","message topic incorrect")
    self.assertEqual(msg.payload,"hello world")
    self.assertEqual(msg.qos,0,"message qos not 0")
    self.assertEqual(msg.retain,False,"message retain flag incorrect")