feat.: add real-time BLE streaming support

[Rampage270906]

The firmware has a partially implemented streaming protocol over the ng BLE service (0xF055/0xF057) that allows raw framebuffer data to be pushed directly to the badge display in real time, bypassing flash storage entirely. The app currently has no support for this service.

How the firmware works:

• Service UUID: 0xF055
• Write characteristic: 0xF057
• Notify characteristic: 0xF056 (1-byte response after each command)

Protocol:
write 0xF057: 02 00 // Enter streaming mode
write 0xF057: 03 [88 bytes] // Push a frame (44 columns × 2 bytes = 88 bytes of raw framebuffer)
write 0xF057: 02 01 // Exit streaming mode

The badge writes incoming frame data directly to fb[] and renders it immediately. After each write, the badge sends a 1-byte success/error notification back on 0xF056.

What the app needs:

• A new UI mode - e.g. a "Live Preview" or "Streaming" screen where the user can push frames in real time
• Connection to 0xF055/0xF057 - currently the app only uses the legacy service (0xFEE0/0xFEE1)
• Frame encoding - convert whatever the app is displaying into the raw uint16_t[44] column-major framebuffer format the badge expects (88 bytes per frame)
• Subscribe to 0xF056 notifications to confirm each frame was received before pushing the next
• No frame rate limit enforced by firmware, so app should throttle to a reasonable rate (e.g. 20–30fps) to avoid overwhelming the BLE connection

[ctrlVnt]

Hi @Rampage270906
Today I did some tests from the app but I was unable to achieve satisfactory results.

In the new firmware when you send one animation the badge doesn't reset, just show the animation and you can send another one as the badge is already paired with the device.

An alternative idea might be to have a whiteboard that updates in real-time as you draw with your finger, though I’m not sure how useful that would actually be. I get the impression that the badge isn't powerful enough to handle an acceptable frame rate. Have you been able to test this feature?