Hi
First of all thanks for every body and HA Team who bring such a lovely platform ,
The project that i am discuss is not mine i just read over internet because i am not in USA so not able to test it ,so those who are there can test and post results here and discuss further
project regarding use just notification when bell press using PI ,Amazon Dash button and we can use Mqtt server instead of writer used it android task app.
here is detail about project
thats basic method behind project
if u using new Button od Amazon Dash
so waiting for more idea and test of this project and Integration ideas with HA
best of luck
thanks