This BB2706-30 module is designed with Cypress CYW20706 dual mode Bluetooth 5.0 SoC. CYW20706 features 96MHz Cortex M3 core, excellent receiving sensitivity down to -96 dBm (BLE GFSK), integrated PA to support Class 1 Tx power up to 12 dBm. These two RF parameters contribute to its best in class link budget to enable long range Bluetooth communication around 100 meters or even longer.
It has a notable merit that its firmware supports concurrent Bluetooth SPP and GATT connections. It establishes a Bluetooth bidirectional communication channel is between the application MCU and the mobile phone through the UART interface. The application MCU can send a corresponding command to enable the Bluetooth module and to set it into different modes, then to send and receive communication data at the SPP or GATT level. The MCU can also read the mode status of the module through serial commands.