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UUID

A 128-bit ID that names a BLE service or characteristic.

A UUID identifies a GATT service or characteristic; SIG-assigned ones use short 16-bit forms, and custom ones need a randomly generated 128-bit UUID.

Examples

  • The 16-bit 0x181A expands to 0000181A-0000-1000-8000-00805F9B34FB.

  • A product makes its own random 128-bit UUID, like cd681706-bf1b-4e51-be94-aaf6bad0b123, instead of inventing a 16-bit one.

See also

service characteristic GATT
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