From the server side, people can be reached all information and server must be export these to maybe excel, mdb etc. So, can I do these with your suggestions?
And also, in aliexpress there is only NRF51822 option. Actually, I can request a sample or some kits form Nordic but I am student and I must solve this problem quickly. (This looks deep thing for this project)
Are there too much difference between NRF51822 and NRF52840?
First of all, I will do something and I will demonstrate them, secondly, I will think deeply for this project.