When i played around with (c) v0.1-23-gc64530 last time i noticed that when writing buffers such as BLE device name and if i recall correctly also the flash_splash_screen do not clear out the past buffers content.

This is relevant when using a shorter BLE device name or an image smaller than the initial flash screen. It is not documented that non-overwritten bytes remain.

This matches the source code

static void cfg_ble_devname(uint8_t *name, uint16_t len)
{
	tmos_memcpy(badge_cfg.ble_devname, name, len);
}

which only overwrites the part of the string which are passed in but the rest is cleared.

If the string needs to be null-terminated that is not checked and not documented.