python - MQTT paho client Connection timeout error -

i running mqtt mosquitto broker on laptop. trying connect 2 paho mqtt clients it: 1) android phone using java paho , 2) raspberry pi using python paho.

from android connection made perfectly. no problems.

however, raspberry reason can not connect. instead client.connect method blocks , after time receive following:

traceback (most recent call last):   file "sensorsclient.py", line 28, in <module>     client.connect(mqttserver, 1883)   file "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 700, in connect     return self.reconnect()   file "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 822, in reconnect     sock = socket.create_connection((self._host, self._port), source_address=(self._bind_address, 0))   file "/usr/lib/python2.7/socket.py", line 571, in create_connection     raise err socket.error: [errno 110] connection timed out 

the code connection below:

import paho.mqtt.client mqtt  def on_connect(client, userdata, flags, rc):     print("connected result code "+str(rc))     client.subscribe("$sys/#")  def on_message(client, userdata, msg):     print(msg.topic+" "+str(msg.payload))  mqttserver = 'zzz.xxx.ccc.qqq' # public ip of laptop   client = mqtt.client("", true, none, mqtt.mqttv31) client.on_connect = on_connect client.on_message = on_message  client.connect(mqttserver, 1883) client.loop_start() 

everythin done within 1 network via wifi. no mobile data. can please explain me why might happen?