[BUG] Out of memory

[state-of-the-art]

Issue description:

When a number of devices was connected - the app is running out of memory. Need profiling.

Environment:

• Application version: 0.2.2
• Device: Samsung Galaxy S8 SM-G950U1
• OS: Android 7.0 Nougat
• Camera: D415/D435i cameras in USB 2.1 & USB 3.2 mode
• Camera firmware: 5.11.1.100

Steps to reproduce:

1. Run the app
2. Connect d415 camera using USB 2.0 cable
3. See the stream
4. Disconnect camera and connect d435i camera using USB 2.0 cable
5. See the stream
6. Disconnect camera and connect d415 camera using USB 3.1 cable
7. See the errors and almost no stream

Expected behavior

Memory is enough - not enough of cleaning the memory when the devices is not available anymore.