I've couple of queries here.
as you said that "Detect the data by IOS app", so do you want a
1. real time system or
2. you me want to poll the data on particular time interval
Relevant Skills and Experience
I've Good MEAN Stack and IOS Knowledge(you can have a looking my profile)
For this task we'll use
NodeJS for Backend
Angular 1 for Frontend
Mongodb for Database
Swift for IOS
Proposed Milestones
$100 USD - NodeJS Server
$66 USD - IOS Application
Additional Services Offered
$15 USD - Hosting NodeJS Server + Documentation
$10 USD - Allow you to manage(Add, Edit, Delete, Metadata) your files Thorough Web Admin Panel
do you want to host this backend or just want to run on localhost ?