Hi.
I did such project with ota before.I have also sam21 board.
I have many experiences for raspberry pi/Arduino and C/Python and have also raspberry pi/Arduino board
I have the solid experience in embedded development and PCB using Allegro, Altium and Eagle for 10+ years.
For example, STB, DVB-T2 modulator, Microwave Transceiver, GPS tracking system, UHF Data transceiver etc.
I have the custom embedded development boards such as Raspberry pi&Arduino ,PIC, ATMEGA,STM32,FPAG,RK3128 and so on.
The hardware and software are all ready.
I look forward for your response.
Best Regards.