Hello Dear,
We are a team of experts with a cumulative experience of more than 50 years in the field of embedded systems, programming, electronics and product development. Our experts have years of experience developing complex devices with ultra low power and complex features. We have years of experience working with wireless, medical, smart metering and telecommunications.
I have checked the details of your project and happy to offer you the best solution for your project. we would develop the prototype for this PoC. However I would recommend not to use an arduino, so we are not hardware locked up). Our proposal would be not to use Arduino libraries and hardware.
I am online for any discussion.
Cheers
Ch