So I am questioning whether it is possible to wirelessly(via bluetooth!) send sensor data to pd directly. In other words: make a pd patch and add it to Pdroidparty, without app-programming.

or if I need to write my own app to port the data to a pd-patch?

My preference is to use the former but I have no idea if and how the [comport]-, [string2any] externals can be added.

Can someone give me some guidance?

Update: so have been attempting to use Pdroidparty at first at use the comport object etc...However for me the combination between Amarino app, my own app, and processing was sufficient to be able to retrieve the data. I have it all working now.
For people that want to do the same.... I would start of by reading miller puckettes book. Additionally the comport is not helpful (at least to my knowledge) for phone purposes, you will have to port the data via e.g. java

Anyone else have a arduino based MIDI input solution i haven't found?