Master-slave integration means that the BLE Bluetooth module acts as a master device and a slave device at the same time . The master-slave integration provides the ability to extend the BLE Bluetooth module . Since a feature called " Link Layer Topology " was added to the Bluetooth 4.1 specification , it has allowed the Bluetooth module to act as both a master and a slave device , in any role . operation in combination.
What kind of scenarios will use the master-slave Bluetooth module ?
The master-slave integration has a wide range of application bases, which provides the possibility for the function expansion of the Bluetooth module. There will be a large number of applications in medical , automotive electronics, home automation and other occasions in the future .
Consider the following scenario: A family with a small baby and parents want to closely monitor the air quality in their home. They bought multiple sensors scattered around the room, with a central display showing the air quality. This is a local solution, parents upstairs may not hear the alarm from the central unit if the windows are accidentally opened . The master-slave multi-role Bluetooth module can avoid this situation , and sensor data is no longer limited to local display. Smartphones can now be connected to the system and data can be collected in the cloud. Parents can view air allergen warnings on the central unit and smartphone , increasing their child's protection.
In this scenario, the Bluetooth module SKB369 uses the master-slave function . The central display unit adopts a master-slave integrated Bluetooth module as a HUB, which is used as a master to collect and display data from air sensor nodes (peripherals), and at the same time as a slave to relay sensor data or alarms to a smartphone as a BLE master.
What are the advantages of the master-slave integration of the Bluetooth module ?
The master-slave integration adds additional functions of the Bluetooth module , cost optimization and ease of use. If the Bluetooth module previously worked as a master in a closed system, it can now also be connected to a smartphone as a slave at the same time, enabling a new dimension of connectivity . Without multiple roles, additional wireless MCUs would be required to implement the same system architecture.