GitHub - Fitbit/bitgatt: The FitbitGatt API is designed to provide a strong state machine around all Android gatt operations with the aim of making Android BLE development across Android vendors as straightforward
Fitbit SDK
Is there any way to check if a Bluetooth device is a Fitbit tracker using Android's Bluetooth APIs? - Stack Overflow
How Fitbit's API makes the world move
Pop up prompt for Fitbit - Google Pixel Community
Fitbit's Charge 5 tracker is on sale for $130 right now | Engadget
Fitbit Spyware Steals Personal Data via Watch Face | Threatpost