basic working of anonymous chat message app

working:
No login, registration
User sent message, other user receives it
But some times other user can send,but unable to receive

with other errors
Bugs:
Unable to get all chat messages with to as User 1 or User 2:
showing only what sent , not including what received
Show from where this message comming from, where its going to
change the title of the chat activity to the other user name
remove login
mobile back button is not working from chat activity to main activity
support the message sent status (network not available, send, received)
only one device is receiving , other user is not receiving, event push
from parse console is not receiving for other device.