What is Bluetooth UUID? How does the Bluetooth master module query and set UUID?

1. Bluetooth UUID:

• The data or attribute characteristics of a slave device are referred to as the device's added profile (configuration file). A profile contains one or more services, and each service contains one or more characteristics. Each characteristic has its own properties, such as Read, Write, and Notify. Every service and characteristic has its own unique UUID identifier.
• The master device can discover and obtain the services and characteristics of the slave device and then communicate with it. Characteristics represent the smallest communication unit between the master and slave devices.
• Read/Write means that the characteristic value can be read from and written to by the master device. Notify indicates that the slave device can proactively send notifications to the master device.

Summary:

UUID Composition:

• A 16-bit UUID is a simplified version, and when combined with a base UUID, it can form a 128-bit standard UUID.
• 0x0000xxxx-0000-1000-8000-00805F9B34FB is a SIG (Special Interest Group) provided UUID, and when combined with a 16-bit UUID, it forms a 128-bit UUID. Private UUIDs can be in the format 0x0000XXXX-0000-1000-8000-00805F9B34FB (16-bit) or XXXXXXXX-0000-1000-8000-00805F9B34FB (32-bit). It is not recommended to use the SIG base UUID for private UUIDs.

2. Example: RHA Technology RHA-BT102M

UUID Query/Set: AT+UUID