App to control a electric pusher using MIT

What do you want to connect to? You have a bluetooth block there so I assume you want to connect it to either an arduino via bluetooth module or an ESP****. It would be good to know. Anyway, you can find BT examples in @Juan_Antonio 's and some other tutorials.

https://community.appinventor.mit.edu/search?q=bluetooth%20arduino%20%23tutorials-and-guides