A big THANK YOU to coderus for this application which is better and better.
I use Mitakuuluu daily and my Jolla is always alternatively connected to wifi and 3G. I have both on.
I have no issues with message delivery as these are instantly delivered as long the other part is online as well.
Also, no issues with CPU consumption or wifi power drawing.
In a normal usage my phone last 3 days.

Looking forward for emoji to be included as well.

A happy Mitakuuluu user.