Mobile development of Mental Health App for iOS

Connectivity and data transfer. The main task of this stage was the development of a communication protocol for file exchange. First, we scanned the Bluetooth devices and set up the connection with the Viatom HRM. Files containing the ECG measurements (HR data) of the user were then stored on the device. Because BLE standards restrict the volume of data that can be transmitted, the package file was split into small parts. The file structure (headers, formats, etc.) was provided by the client from the vendor, SDK. After all the parts were completely transferred to the mobile phone, they were combined into one file based on information in the header of each part and the checksum verified. Then, all of the HR data was made available to the user.

Previously, we mentioned that there would be no time for UX/UI designs. Instead, we used the TinyConstraints framework and suggested our vision of the UI to the client, which was approved. For the best and most informative HR data visualization, we selected the Charts framework. For storing data and authentication we chose Firebase as the most suitable and least expensive (free) solution. Logins to Facebook and Twitter using OAuth were added as well. The client did not want to publish the app on the App Store, so for delivery and testing purposes, we used TestFlight.