Hello,
We recently developed a raspberry pi "hat" to pilot drones/cars/boats/etc via 3G cellular connection, in order to achieve "unlimited" control range.
The code is all open source and is available here: https://github.com/nfco/cellpilot
We are currently testing it using hand-soldered PCBs and 3d-printed cases.
Any feedback would be appreciated to guide the development of the project.
We also just started a campaign to fund the first production run and need your help to achieve the goal of the campaign.
https://www.indiegogo.com/projects/cellpilot/x/12417937#/