BLE

Bluetooth Low Energy (BLE) is the short-range radio standard that most connected physical things speak. Introduced with Bluetooth 4.0, it was designed around one priority — running for months or years on a coin-cell battery — by keeping the radio asleep and exchanging small, structured bursts of data only when needed. It organizes information as GATT services and characteristics, a simple attribute model that maps cleanly onto the kind of read/write/notify operations an API developer already understands.

• Ultra-low power - Devices stay dormant and wake briefly to transmit, so sensors and wearables last far longer than classic Bluetooth allowed.
• GATT data model - Data is exposed as services and characteristics that can be read, written, or subscribed to for notifications.
• Short-range and local - Communication happens device-to-device over a few meters, with a gateway or phone bridging to the network.
• Ubiquitous - Built into virtually every modern phone, laptop, and microcontroller, making it the default for consumer IoT.

BLE matters to API operations because it is where machine-generated data begins. A fitness band, a medical sensor, an industrial beacon, or a smart lock speaks BLE to a nearby hub or phone, which then relays that data over HTTP APIs into the cloud — and sends commands back down the same path. Designing the API layer above a fleet of BLE devices means modeling those GATT characteristics as resources, handling intermittent connectivity and eventual delivery, and treating each device as a first-class producer and consumer in the wider API estate. As agents begin to act on real-world signals, BLE is one of the standards quietly feeding them the physical data they reason over.