I am trying to install micropython-umqtt.robust on my Wemos D1 mini.
The way i tried this is as follow.
I use the Thonny editor

I have connected the wemos to the internet.
in wrepl type:
import upip
upip.install('micropython-umqtt.simple')
I get the folowing error: Installing to: /lib/
Error installing 'micropython-umqtt.simple': Package not found, packages may be partially        installed
upip.install('micropython-umqtt.robust')
I get the folowing error: Error installing 'micropython-umqtt.robust': Package not found,   packages may be partially installed

Can umqtt be installed on Wemos D1 mini ? if yes how do I do this ?
Thanks for your help Reilly, 
The way I solved it is as follow. With a bit more understanding of mqtt and micropython I found that the only thing that happens when you try to install umqtt simple and umqtt robust,is that it makes in de lib directory of your wemos a new directory umqtt. Inside this directory it installs two files robust.py and simple.py. While trying to install them I kept having error messages. But I found a GitHub page for these two files, so I copied these files. Made the umqtt directory within the lib directory and in this umqtt directory I pasted the two copied files. Now I can use mqtt on my wemos.
umqtt.robust on Wemos