Q1 - I plan to use Raspberry pi zero + PXFmini with another shield on top.
The shield will use pin 19,21,22(for reset),23 and 24(chip select), I wonder if PXFmini will use any of these pins especially 22 and 24.
Q2 - I intend to use the drone with another shield(it allows the drone act as a message receiver, remote gateway, in the sky!) on top of PXFmini for my IoT application. I am wondering would it be much difficult to develop such an application in ROS which using Raspberry pi is used for flying the drone and also simultaneously act as a gateway.